Eroding pulse plasma accelerator

FIELD: electricity.

SUBSTANCE: cathode (1) and two electrically isolated anodes (2, 3) form accelerator channel of eroding pulse plasma accelerator (EPPA). Dielectric blocks of ablating material are installed between the first anode (2) and cathode (1). EPPA comprises transporter for dielectric blocks, butt end insulator (4), electric discharge initiator with electrodes (7). Power supply system includes two capacitive energy storage units (9, 10), current leads connecting capacitive energy storage units with discharge electrodes and power supply unit (8) for electric discharge initiator. The first anode (2) id placed in the accelerator channel from the side of butt end insulator (4). The second anode (3) is placed from the side of the accelerator channel output. The first energy storage unit (9) is coupled between the second anode (3) and cathode (1). The second energy storage unit (10) is coupled to anodes (2, 3). The second energy storage unit (10) is coupled to the first anode (2) through control current lead made as a rod (11). The control current lead is placed from the side of butt end insulator (4) and isolated electrically from the accelerator channel. The rod (11) functioning as the control current lead is placed between the first anode (2) and cathode (1) and oriented orthogonally in regards to the anode surface and opposite surface of the cathode. The rod (11) is connected to the second capacitive energy storage unit (10) so that passing-through electric current IT is directed equally in regards to charging current IP between the first anode (2) and cathode (1).

EFFECT: simplified EPPA design, improved reliability and increased operational life, improved controllability and stability of characteristics of the generated plasma flow due to synchronisation of processes of evaporation and acceleration of working medium.

13 cl, 4 dwg

 

The invention relates to plasma technology and plasma technology, in particular to a plasma accelerators that can be used to create thrust as electric propulsion engines of the spacecraft, and also for the generation of high-speed plasma streams at the experimental investigations and model tests.

In erosion pulsed plasma accelerators (AIPU) used solid working substance in the form of a solid dielectric pieces, made of ablereader material, usually Teflon. When you enable EIPO originally manufactured electrical breakdown of the interelectrode gap, then ignites the main electric discharge between the discharge electrodes. Released due to arc discharge energy is erosion (ablation) and evaporation of the working medium from the working surfaces of the dielectric blocks, ionization of the working substance and the acceleration of the ionized gas. Electrical discharge in AIPU is of short duration: the duration of the discharge is from 1 to 100 μs. Existing models EIPO have a relatively low specific tractive power characteristics due to the uneven production of dielectric checkers and a lack of synchronization between the processes of evaporation, ionization and uskorenie the working substance.

Only 20-40% evaporated from the walls of the dielectric substances leave the accelerator channel imps with speeds of the order of 20-30 km/s Is the part of the working substance, which accelerated volumetric electromagnetic force resulting from the interaction of the discharge current with its own magnetic field. Other 80-70% of the working medium leaving the accelerator channel with subtelomere and thermal velocities of ~0.5-5.0 km/s This is because the evaporated working medium does not have time to interact with discharge current for the duration of the current pulse. Therefore, the values of the mean bulk velocity of the plasma at the exit of the accelerator channel EIPO usually do not exceed ~8-12 km/s

A number of technical solutions aimed at solving the time inconsistency of evaporation of the working fluid, on the one hand, and processes of ionization and acceleration of the formed plasma clots, on the other hand. For example, in the patent RU 2253953 (published 10.06.2005) described EIPU, providing the increase of the share of the working substance, effectively accelerating electromagnetic force. Improving the efficiency of the working fluid and the specific tractive force is provided by synchronization processes ablation (erosion) dielectric checkers and generate volumetric electromagnetic force accelerating ionized working substance. Objectives the synchronization of these processes in AIPU is decided by the maximum possible convergence of external impedances and internal electrical circuit of the accelerator.

Known EIPO contains two electrodes, a dielectric checkers established between the electrodes and made of ablereader material, accelerating channel with an open end portion, the walls of which are formed by the surfaces of the electrodes and dielectric checkers, and capacitive energy storage. The current leads connecting the electrodes with an energy accumulator, together with the electrodes and the drive form the external electrical circuit. Between the electrodes at the end part of the discharge channel, the opposite open end portion, a prison and the device initiating the discharge.

Characteristics of the external circuit of the accelerator is selected from the conditions: C/L≥2, where C is the electrical capacitance of the external circuit in µf, and L is the inductance of the external circuit in NH, the value of which is selected from the condition: L≤100 NH. Under these conditions the capacitance discharge circuit EIPO centered in the drive, increasing the normal level of ~10-30 µf to level ~40-500 µf depending on the level of the bit energy and the inductance L of the external electrical circuit. In this case, can be obtained impulse discharge current with two half-periods of the oscillations, the energy of the second discharge drive does not exceed 20% of the energy of the first class. Increase the duration of the current pulse leads to the increase is the mass of the working substance, which effectively accelerated by the electromagnetic force. By optimizing the external circuit level impedance approaches the impedance of the internal circuit. As a result, the parameters of external and internal electrical circuits become more consistent without complicating the system power supply.

There are other technical solutions that help to ensure the synchronization of the processes of evaporation, ionization and acceleration of the working substance through the use of other technical means. The closest analogue of the invention is EIPO described in international application WO 2008/035061 A1 (published 27.03.2008).

The accelerator contains a two-stage accelerator (bit) channel with two pairs of insulated electrodes. The cathodes of each pair of electrodes are at ground potential and the anode independently connected to separate power supply units (capacitive storage). The open end portion of the accelerator channel formed by the edges of the electrodes of the second stage AIPU. This part of the accelerator channel can be made in the form of an expanding nozzle. On the opposite side of the accelerator channel between the electrodes of the first stage has a separating insulator. The anodes of the first and second stage and separating them insulator form a first wall of the accelerator channel, and cut the water and separating them insulator - the second channel wall. Movable dielectric checkers made of ablereader material, which is polytetrafluoroethylene (PTFE-4). Checkers from ablereader material installed between the electrodes of the first stage, implemented with the ability to move and with a spring plungers for movement of checkers in the process of ablation in a cavity of the accelerator channel. In the hole of the cathode of the first stage has the electrodes block the initiation of discharge.

Using the unit enables the connection of the electrodes of the first and second stages and the electrodes block the initiation of the discharge in a certain sequence. When you enable EIPO original voltage pulse (~20 kV) is applied to the electrodes block the initiation of the discharge. After initiation of the discharge, the anode of the first stage is connected via a high-speed switch (switch) to a capacitive drive the first stage. The cathode of the first stage is fed pulse voltage of ~3000 C. In the effects of convective and radiant flows from the region of arc discharge between the electrodes of the first stage is intense ablation and vaporization of the working fluid on the surfaces of the dielectric checkers facing the cavity of the accelerator channel. The flow of gaseous working substance under the action of gas-dynamic C is moved with a fairly low speed of the first stage of the accelerator in the second step.

Ionization and acceleration of the gaseous working substance is carried out after filling the gaseous working substance of the second stage of the accelerator and the connection electrodes of the second stage to the second capacitive storage using a second high speed switch (switch). The cathode of the second stage serves one or more voltage pulses of ~3000 In delayed relative to the voltage pulses applied to the cathode of the first stage.

Despite the wide possibilities for synchronization of the processes of evaporation, ionization and acceleration of the working substance, the device is similar and has a complex structure and a complex control system and power supply that has a negative impact on the reliability of the device, its life and physical specifications. These shortcomings relate to the need to control switching of three external electrical circuits through which the discharge electrodes of the two steps of the acceleration channel and the electrodes block the initiation of discharge are connected to the individual capacitive energy storage. To perform these actions require high-speed high-current switches and line delays that need to synchronize the processes of evaporation, ionization and acceleration of the working substance. In addition, by using the device-Ana is God, it is impossible to adjust the intensity of evaporation of the working substance and the moving speed of the evaporated gaseous working substance in the acceleration channel EIPU, what you need to eliminate time delays and temporary mismatch of evaporation of the working substance and acceleration of a plasma clot.

The invention is aimed at enabling the management processes of ablation and evaporation of the working substance and data synchronization processes with the process of acceleration of the formed plasma clot with minimum size and weight of the plasma accelerator. The solution to this technical problem will simplify the design EIPU, to increase its reliability and to increase the resource, improve weight and dimensions, improving manageability EIPO and to ensure stability traction due to the synchronization of the processes of evaporation and acceleration of the working substance.

These technical results are achieved when using EIPU, which includes a cathode and two electrically isolated anode, which form the accelerator channel. Between the first anode and cathode is set at least one dielectric piece, made of ablereader material. EIPO provided with means for moving the dielectric checkers. Between the first anode and cathode installed end insulator. The first anode is located in the acceleration channel-side end of the insulator, the second anode is located on the output side will accelerate inogo channel. Part EIPO includes a device initiating electric discharge, which is located in the slot in the cathode and located opposite surface of the first anode. The power supply system includes two capacitive energy storage, current leads connecting the energy storage with discharge electrodes, and a power supply device initiating electric discharge.

The first energy storage device connected between the second anode and cathode. The second energy storage device connected to the anodes. With the first anode of the second energy storage device is connected via an electrically isolated managing feeding. This current lead is located between the first anode and the cathode and is oriented orthogonal to the surface of the first anode and the opposite surface of the cathode.

The use of partitioned anode, consisting of two parts, sequentially disposed opposite the cathode along the direction of the acceleration of a plasma clot, and connecting the discharge electrodes of the two capacitive energy storage, the first of which is connected with the second section of the anode (second anode) and the cathode, and the second drive with two partitions of the anode between the first and second anode), allows controlled synchronization of the processes of evaporation, ionization and acceleration of the working substance. Should be about the mark, the synchronization of these processes is carried out without the use of switching circuitry power supply with minimum energy cost and minimum sizes of the accelerator channel AIPU.

The synchronization process of evaporation hard working substance and the subsequent acceleration of the ionized gaseous substances is due to the controlled influence of the electric discharge generated in the first stage of the accelerator channel (between the first anode and cathode) on a working surface of the dielectric checkers made of ablereader material. Managing the impact of the flow of energy radiated by the discharge of the first stage, is produced by excitation of the magnetic field, caused by flow of electric current through the control current lead. This current lead is oriented between the discharge electrodes so that when the interaction of electric current discharge with an external magnetic field occurs ampere directed to the end insulator. As a result of action of this force on the channel arc discharge with intense ablation (erosion) and evaporation of the working substance.

As a consequence, the input of the second stage EIPO goes formed a fairly uniform flow of the working substance. However, when dense razoobrazny the first flow of the working substance in the discharge period of the second stage of the second anode and the cathode are under "standby" bit voltage. Due to selection of electrical characteristics of the capacitive energy storage can be excluded retardation of evaporation of the working substance in relation to the beginning of the acceleration process in the second stage AIPU. This circumstance contributes to the efficiency of plasma acceleration under the action of electromagnetic forces and hydrodynamic pressure.

Depending on the location and feed direction of the dielectric checkers in the acceleration channel and location Manager copadata relative to the first anode of possible designs AIPU. In case of position control electrical power supply from the side face of the insulator it is connected to the second capacitive storage so that the current flowing through it an electric current is equally directed towards the discharge current between the first anode and cathode. Managing current lead electrically isolated from the accelerator channel. As managing electrical power supply can be used a metal rod.

Managing current lead can be located from the output of the accelerator channel and electrically isolated from the accelerator channel. In this case, the control current lead connected to the second capacitive storage so that the current flowing through it electric is in the opposite direction in which the compared to the discharge current between the first anode and cathode.

Managing current lead may be in the form of a plate with a Central hole, forming the flow area of the accelerator channel. Managing current lead electrically isolated from the accelerator channel by means of two insulating plates made of a dielectric material. Insulating plates have Central openings aligned with the Central hole of the control electrical power supply, and are in contact with opposite surfaces of the control electrical power supply.

Accelerator channel preferably runs with expanding output part formed by the flat surfaces of the cathode and the second anode. The surface of the first anode and the surface of the opposite side of the cathode will generally have a flat shape.

When the longitudinal (along the acceleration channel) is fed into the acceleration channel dielectric checkers her face working surface forms an end surface of the accelerator channel. In this case, the dielectric piece is located between the end insulator and the input part of the accelerator channel. EIPA provides a means of moving dielectric checkers in the direction of the output of the accelerator channel.

When the lateral (transverse) applying a dielectric checkers in the acceleration channel preferably uses two dielectric is ASKI, symmetrically mounted relative to the median plane of the accelerator channel. EIPA provides a means of moving dielectric checkers towards the median plane of the accelerator channel. End surfaces of the dielectric checkers form the side surface of the accelerator channel.

The first anode is electrically isolated from the second electrode, for example, using a dielectric plate mounted between adjacent surfaces of the anodes. This plate is preferably of high temperature ceramics.

To ensure optimal conditions for effective work EIPO end part of the dielectric plate from the output of the accelerator channel is offset relative to the plane of the cross-section of the accelerator channel, where the output edges of the dielectric checkers. Offset in the direction of the expiration of a plasma clot is selected in the range from 8 mm to 25 mm In this case, the end portion of the first anode-side output of the accelerator channel is offset relative to the plane in which is located the end face of the dielectric plate. The offset in the direction of the end insulator is selected in the range from 5 mm to 10 mm

Hereinafter the invention is explained in the description of specific examples of implementation of izopet the deposits. On the accompanying drawings shows the following:

in Fig.1 - scheme EIPO with a longitudinal incision of the accelerator channel at the location of the driving electrical power supply from the side face of the insulator;

in Fig.2 - scheme EIPO with a longitudinal incision of the accelerator channel at the location of the driving electrical power supply from the output of the accelerator channel.

in Fig.3 is a view of AIPU depicted in Fig.2, from the output of the accelerator channel with local incision placement dielectric checkers;

in Fig.4 is a diagram of a variant design EIPO filing dielectric checkers along the accelerator channel.

EIPO, the construction of which is shown in Fig.1, includes a cathode 1, a first anode 2 and a second anode 3. The discharge electrodes 1, 2 and 3 have a flat shape. Between the first anode 2 and the cathode 1 is an end insulator 4. The anodes 2 and 3 are electrically isolated from each other via the dielectric plate 5 installed between adjacent surfaces of the anodes. The plate 5 is of high temperature ceramics, which is boron nitride. Two dielectric checkers 6, made of ablereader material, which is used as polytetrafluoroethylene, symmetrically mounted relative to the median plane of the accelerator channel. EIPO provided with means for moving elektricheskij checkers towards the median plane of the accelerator channel. This tool is a spring-loaded plunger (not shown).

The surface of the anodes 2 and 3, the cathode 1, the end of the insulator 4 and the dielectric checkers 6 form of the accelerator channel AIPU. Accelerator channel made with expanding output part formed by the flat surfaces of the second anode 3 and the cathode 1. Part of the discharge electrodes located in the area of expanding the accelerator channel, tilted with respect to the parts of the discharge electrodes in the layout area of the dielectric checkers 6. The first anode 2 and the oppositely located portion of the cathode 1 constitute a first step AIPU. The second anode 3 and the oppositely located portion of the cathode 1 is formed the second stage AIPU.

In the technological hole made in the side of the cathode 1, located opposite the first electrode 2, the device initiating electric discharge with isolated electrodes 7. To the electrodes 7 are connected to the power supply unit 8 of the device initiating electric discharge (BIR).

Power system EIPO includes a first capacitive energy store (EN) 9, the second capacitive energy store (EN) 10 and the block BIR 8. Drive IN 9 is connected between the second anode 3 and the cathode 1. Drive IN 10 is connected to the anodes 2 and 3. To the first anode 2 drive IS connected through an electrically isolated charge is a first current lead, made in the form of a rod 11. Managing current lead (rod 11) is located on the side face of the insulator 4 between the first anode 2 and the cathode 1 and is oriented orthogonal with respect to the opposite surfaces of the discharge electrodes. The rod 11 is electrically isolated from the accelerator channel. Drive IN 10 and the control current lead is included in an external electric circuit so that the current flowing through the rod 11 of the electric current IThas the same direction relative to the discharge current IPflowing between the first anode 2 and the cathode 1.

In another embodiment, the design EIPO depicted in Fig.2 and 3, managing current lead is from the output of the accelerator channel and is made in the form of a metal plate 12, in which the Central hole, forming a throttle cross section of the accelerator channel. Conductive plate 12 is electrically isolated from the accelerator channel by means of two insulating plates 13 made of a dielectric material, for example high-temperature ceramics. The insulating plate 13 has a Central hole coaxial with the Central hole of the control current supply forming the flow area of the accelerator channel. Isolation control electrical power supply in the acceleration channel is C is the cost of installation plate 13 in contact with the opposite surfaces of the conductive plate 12.

Plate 12 together with the insulating plate 13 is installed in the technological hole made in the cathode 1. This provides electrical contact plate 12 with the second anode 2 and the electrical insulation of the plate 12 relative to the cathode 1.

Drive IN 10 and the control current lead is included in an external electric circuit. On the side of the plate, which is oriented orthogonal to the surface of the first electrode 2 and the opposite surface of the cathode 1, when the drive is connected IN 10 the electric current IT. When current IThas the opposite direction to the electric current IPflowing between the first anode 2 and cathode 1 when the ignition of the main discharge.

In this example, execution EIPO end part of the dielectric plate 5 from the output of the accelerator channel is offset relative to the plane of the cross-section of the accelerator channel, where the output edges of the dielectric checkers 6, at a distance of 10 mm in the direction of the expiration of a plasma clot. End portion of the first anode 2 by the output of the accelerator channel is offset relative to the plane in which is located the end edge of the dielectric plate 5, a distance of 7 mm in the direction towards the end is salatore 4.

In a variant design EIPO depicted in Fig.4, there is a single dielectric piece 14 made of ablereader material. Piece 14 is located between the end insulator 4 and the input part of the accelerator channel. EIPA provides a means of moving dielectric pieces 14 in the longitudinal direction (in the direction of the output of the accelerator channel). In this embodiment, the structures are used for the cathode 15 and the second anode 16 having a flat shape without sloping output parts serving for the formation of the expanding part of the accelerator channel. End the working surface of the dielectric checkers 14 forms an end surface of the accelerator channel. The flat surface of the second anode 16 and cathode 15 is formed of the accelerator channel with a constant cross-section is rectangular in shape (without expanding).

Work EIPO depicted in Fig.1, is as follows.

When you enable AIPU is the ignition of the arc discharge between the anode 2 and the cathode 1. In block BIR 8 is formed short (τ~1 MS) high-voltage pulse applied to the electrodes 7 of the device initiating electric discharge. In the high voltage electrical breakdown along the surface of the dielectric is formed conductive plasma clot, shorting the discharge electrodes 1 and 2.

After SAG Gania initiating discharge is an electrical breakdown of the main electrode gap between the electrodes 1 and 2, are pre-supplied with voltage from the drive IN 9. In the acceleration channel of the discharge electrodes 1 and 2 are electrically isolated from each other with end of the insulator 4. Simultaneously with the ignition of the main discharge in the first stage of the accelerator channel on the anodes 2 and 3 from the drive IN 10 is pulse discharge voltage. In an external electric circuit connected to the anode 2 through the control of current supply, electric current flows. The direction of the current ITflowing through the rod 11, coincides with the direction of the discharge current IPflowing between the electrodes 1 and 2 of the first stage of the accelerator channel.

Due to the selected spatial orientation of nearby conductors with electrical current ITand IP, which uses a fixed rod 11 and moving between the electrodes 1 and 2 plasma harness arc discharge, and connections to an external electrical circuit, determining the directions of the currents ITand IPthat is the electromagnetic interaction between the conductor with current. As a result of this interaction on plasma harness arc discharge, there is an additional power amp, designed to end the insulator 4. The main ampere acting on the cord plasma of the arc discharge in the discharge is the volume of the first stage of the accelerator channel, due to the interaction of an external magnetic field that is excited by an electric current flowing through the bit electrodes, with the moving conductor (plasma harness) through which the electric current IP.

Due to additional controlled influence on plasma harness is controlled to move relative to the working face surfaces of the dielectric checkers 6. The possibility of a managed move plasma harness in the first stage of the accelerator channel provides for the regulation of the processes of ablation and evaporation hard working substance. Adjustable evaporation of the working substance, in turn, allows to form a relatively uniform flow of gaseous working substance, which is then routed to the second stage of the accelerator channel, in which additional ionization and acceleration of the working substance.

Ablation (erosion) and evaporation hard working substance, which is made of dielectric pieces 6, occur in the first stage of the accelerator channel under the action of radiation and convection from the region of the electric discharge. The resulting gaseous carbon working substance partially Insulza under the action of electric discharge of the first stage and is accelerated under the action of the m electromagnetic forces and hydrodynamic pressure.

The application of the control electrical power supply allows you to manage the processes of ablation and evaporation due to the controlled transfer of plasma harness. The required parameters are provided by matching the electrical characteristics of the external circuit and the drive IN 10. Due to the controlled evaporation of the working substance is formed a dense flow of gaseous working substance with the specified characteristics of the leading edge flow. Consequently eliminates the delay of the formation process of the flow of gaseous working substance in relation to the beginning of the process of acceleration of a plasma clot in the second stage of the accelerator channel.

Formed in the first stage of the accelerator channel gaseous stream of partially ionized working substance flows into the second stage formed by the surfaces of the anode 3 and the cathode 1. The surface electrodes 3 and 1 is inclined relative to the flat portions of the electrodes 1 and 2, forming the first stage of the accelerator channel, through which is formed by extending a part of the accelerator channel.

Plasma clot under the action of electromagnetic forces and hydrodynamic pressure passes from the first to the second stage of the accelerator channel, closing the electrodes 3 and 1, which by the time of input of a plasma clot under standby potential is scrap. Electric power to the electrodes 3 and 1 through the external electrical circuit of the drive IN 9. Using the second-stage acceleration channel is the main contribution of energy to the acceleration of the plasma clot formed in the first stage. Resulting from the widening of the accelerator channel plasma flow creates a jet thrust.

While using dielectric checkers 6 during ablation of their working surfaces occurs automatically feed checkers by moving them to the middle plane of the discharge channel using a spring plungers (not shown). The position of the end parts of the dielectric checkers relative to the electrodes 1 and 2 is fixed by means of limiting the movement of checkers, which are in the form of protrusions on the surface of the discharge electrodes. The travel stop draughts provide given the estimated distance between the end working surfaces of the dielectric checkers 6.

After successive discharge drives IN 10 and IN 9 stops applying voltage to the discharge electrodes 1, 2 and 3, stop the pulse discharge voltage in the first and second stages of the accelerator channel and completes the process of impulsive acceleration of a plasma clot. Then there is the charge drives IN 9 and IN 10 working Zap semoy energy, flow discharge voltage to the discharge electrodes 1, 2 and 3 and the subsequent ignition of the electric discharge between the cathode 1 and the anode 2 through the electrodes 7 of the device initiating electric discharge. The process of charge-discharge drive IN 9 and IN 10 and the ignition of the electric discharge between the discharge electrodes is periodically repeated. By periodically applying voltage to the discharge electrodes arranged pulsed mode AIPU.

Working versions EIPO depicted in Fig.2 and 3, is similar. Differences in the operation of this variant EIPO due to the location and form of execution control electrical power supply connected to the second drive IN 10.

Due to the fact that the control current lead is from the output of the accelerator channel, that is, on the other hand with respect to the plasma harness formed after ignition of the arc discharge in the first stage of the accelerator channel, changes the direction of the current flowing through the current supply of the electric current. The location of the control current supply determines the form of its implementation, which should ensure unimpeded flow of accelerated plasma flow through the flow area of the accelerator channel along its length. In this design option e is PU managing current lead is made in the form of a conductive plate 12 with a Central hole, forming the flow area of the accelerator channel through which flows the accelerated plasma flow. The insulation plate 12 from the accelerator channel by using two dielectric plates 13 mounted on opposite sides of the plate 12.

Like the first option design EIPO simultaneously with the ignition of the main discharge in the first stage of the accelerator channel on the anodes 2 and 3 from the drive IN 10 is fed pulse voltage. In an external electric circuit connected to the anode 2 through the control of current supply, electric current flows. The direction of the current ITflowing through the plate 12, opposite to the direction of the discharge current IPflowing between the electrodes of the first stage of the accelerator channel.

Due to the selected spatial orientation of nearby conductors with electrical current ITand IP, which used the fixed plate 12 and moving between the electrodes 1 and 2 plasma harness arc discharge, and connections to an external electrical circuit, determining the directions of the currents ITand IPthat is the electromagnetic interaction between the conductor with current. The result of this interaction on plasma harness arc discharge, there is an additional power amp, directed to the face is the first insulator 4. Main ampere acting on the cord plasma of the arc discharge in the discharge volume of the first stage of the accelerator channel, is defined as in the first embodiment design EIPO, the interaction of the magnetic field generated by electric current flowing through the discharge electrodes, the moving conductor (plasma harness) through which the electric current IP.

When additional managed impact on plasma harness is controlled to move relative to the working face surfaces of the dielectric checkers 6. In this case also regulated processes of ablation and evaporation hard working substance before filing in the second degree of the accelerator channel. Due to this, to synchronize the processes of evaporation of the working substance and the acceleration generated plasma clot.

In the process EIPO dielectric checkers 6 as erosion of their front parts automatically move in the accelerating channel using a spring plungers. The feed direction of the dielectric checkers in the acceleration channel of the arrows shown in Fig.3.

Work simplified design EIPO depicted in Fig.4, is similar. Differences in the versions EIPO due to direct the linear form of the accelerator channel (without expanding output part) and use one dielectric checkers 14, installed between the end insulator 4 and the input part of the accelerator channel.

In this example, execution EIPO end working surface checkers 14 forms an end surface of the accelerator channel. The cathode 15 and the second anode 16 have a flat shape and is made in the form of plates. A means of moving dielectric checkers 14 made in the form of a spring-loaded plunger (not shown), moves the checkers along the acceleration channel in the direction of its output part. The position of the working end surface of the dielectric checkers 14 is fixed in the acceleration channel with the projections made on the surfaces of the anode 2 and the cathode 15 in contact with the side surfaces of the pieces.

Similarly, the second variant design EIPO depicted in Fig.2 and 3, before ignition of the main discharge in the first stage of the accelerator channel on the anodes 2 and 16 of the drive IN 10 is fed pulse voltage. In an external electric circuit connected to the anode 2 through the control of the current supply, the electric current IT. The direction of the current ITflowing through the plate 12, oriented orthogonal with respect to the surrounding surfaces of the electrodes 1 and 2, opposite to the direction of the discharge current IPflowing between the electrodes 15 and 2 first-stage acceleration channel is.

Due to the selected spatial orientation of nearby conductors with electrical current ITand IP, one of which is stationary plate 12 and the second moving between the electrodes 15 and 2 plasma harness arc discharge, and the connections to the external circuit, which determines the directions of the currents ITand IPthat is the electromagnetic interaction between the conductor with current. Plasma harness arc discharge, there is an additional power amp, designed to end the insulator 4. Main ampere acting on the cord plasma of the arc discharge in the discharge volume of the first stage of the accelerator channel, caused, as in the second design option EIPO, the interaction of the magnetic field generated by electric current flowing through the discharge electrodes, the moving conductor (plasma harness) through which the electric current IP.

As a result, additional controlled influence on plasma harness is controlled to move relative to the working surface of the dielectric checkers 14, forming the end wall of the accelerator channel. This ensures the regulation of the processes of ablation and evaporation hard working substance before filing the second superprofile channel. The generated flow of gaseous working substance is then fed to the second stage of the accelerator channel. Adjustable evaporation hard working substance allows to synchronize the processes of evaporation of the working substance and the acceleration generated plasma clot.

In the process EIPO dielectric piece 14 as erosion of its end parts are automatically fed in the acceleration channel using a spring plunger. The feed direction of the dielectric checkers shown by the arrow in Fig.4.

Compared with the selected device prototype at work EIPO synchronization processes of evaporation and accelerate the working substance is carried out without requiring a complex control system with high-speed switches external electrical circuits. Thanks to the motion control of the plasma column near the working surface of the dielectric checkers, increases the stability characteristics of the plasma flow at the exit of the accelerator channel each pulse enable AIPU. Due to the control and synchronization of processes occurring in the acceleration channel, ensures high reliability and the required resource device when the best weight indicators and simpler construction of the device.

The above-described embodiments and the finding is based on specific design options EIPU, however, this does not preclude the achievement of the technical result and in other cases the implementation of the invention. For example, depending on the specific purpose EIPO and current technical challenges can be selected shape and dimensions of the discharge electrodes, forming accelerator channel, the location, shape and material control electrical power supply, and the number of dielectric pieces, made of ablereader material, their location relative to the accelerator channel and the means of their movement.

EIPO may find application as the Executive body of the control system of the spacecraft, and also pulse the injectors low-temperature plasma is used, for example, when conducting experimental studies and model tests. The invention may also be used for the implementation of various technological operations related to processing of products and the modification of the properties of materials.

1. Erosion of the pulsed plasma accelerator containing a cathode and two electrically isolated anode, which form the accelerator channel, at least one dielectric piece, made of ablereader material and mounted between the first anode and cathode, means for moving the dielectric checkers, Tarceva the insulator, installed between the first anode and the cathode, the device initiating electric discharge, which is located in the slot in the cathode and located opposite surface of the first anode, the power system including two capacitive energy storage, current leads connecting the energy storage with discharge electrodes, and a power supply device initiating electric discharge, the first anode is located in the acceleration channel-side end of the insulator, the second anode is located on the output of the accelerator channel, the first energy storage device connected between the second anode and cathode, the second energy storage device connected to the anodes, and the second energy storage device is connected to the first anode through an electrically isolated managing current lead located between the first anode and the cathode and oriented orthogonal to the surface of the first anode and the opposite surface of the cathode.

2. The accelerator under item 1, characterized in that the control current lead is located on the side face of the insulator and electrically isolated from the accelerator channel, and managing current lead connected to the second capacitive storage so that the current flowing through it an electric current is equally directed towards the discharge current lane between the second anode and cathode.

3. The accelerator under item 2, characterized in that the control current lead is made in the form of a rod.

4. The accelerator under item 1, characterized in that the control current lead is from the output of the accelerator channel and electrically isolated from the accelerator channel, and managing current lead connected to the second capacitive storage so that the current flowing through it an electric current has the opposite direction with respect to the discharge current between the first anode and cathode.

5. The accelerator under item 4, characterized in that the control current lead is made in the form of a plate with a Central hole, forming the flow area of the accelerator channel.

6. The accelerator under item 4, characterized in that the control current lead electrically isolated from the accelerator channel by means of two insulating plates made of dielectric material with the insulating plate has a Central hole coaxial with the Central hole of the control electrical power supply, and installed in contact with the opposite surfaces of the control electrical power supply.

7. The accelerator under item 1, characterized in that the acceleration channel is made with expanding output part formed by the flat surfaces of the cathode and the second anode.

8. The accelerator under item 1, characterized in that the surface p is pout of the anode and the surface of the opposite side of the cathode have a flat shape.

9. The accelerator under item 1, characterized in that it contains a single dielectric piece, made of ablereader material located between the end insulator and the input part of the accelerator channel, and means to move the dielectric checkers in the direction of the output of the accelerator channel, with the end working surface of the dielectric checkers forms the end surface of the accelerator channel.

10. The accelerator under item 1, characterized in that it contains two dielectric checkers made of ablereader material, symmetrically mounted relative to the median plane of the accelerator channel, and means to move the dielectric checkers towards the median plane of the accelerator channel, with the end surfaces of the dielectric checkers form the side surface of the accelerator channel.

11. The accelerator under item 1, wherein the first anode is electrically insulated from the second electrode through the dielectric plate mounted between adjacent surfaces of the anodes.

12. The accelerator on p. 11, wherein the dielectric plate is made of high temperature ceramics.

13. The accelerator on p. 11, characterized in that the end part of the dielectric plate from the output of the accelerator channel shifted consider is ina plane of the cross-section of the accelerator channel, where the output edges of the dielectric checkers, at a distance of 8 mm to 25 mm in the direction of the acceleration of a plasma clot, while the end portion of the first anode-side output of the accelerator channel is offset relative to the plane in which is located the end face of the dielectric plate, at a distance of 5 mm to 10 mm in the direction of the end insulator.



 

Same patents:

FIELD: electricity.

SUBSTANCE: plasma gun contains an outer electrode, an inner electrode holding the cathode and placed coaxially, a vortex chamber feeding plasma-generating gas. The electrodes are insulated and placed in induction coils. The inner electrode holding the cathode is made hollow. Methane hydrocarbons are fed to curved channel of the outer electrode through outlet channels and circular cavity. To near-cathode area methane hydrocarbons are fed through a tube placed at the axis of the inner electrode holding the cathode and cavity formed by location of the cathode in the hollow electrode holding the cathode. The plasma gun has at least four channels for hydrocarbon gas delivery to the near-cathode area of arc discharge. The channels are placed evenly in circumferential direction. Total area of the channels open flow area provides gas velocity of about 0.3-0.5 of sound speed at the preset complete pressure and temperature of the feed gas. Delivery of hydrocarbon gas to the near-cathode area of arc discharge is designed in three versions.

EFFECT: improved resource of the electrode operation due to sustainable renewal of the protective nanostructured carbonaceous layer.

4 cl, 5 dwg

Plasma accelerator // 2540140

FIELD: physics.

SUBSTANCE: plasma accelerator is designed to generate traction when moving space objects and for producing composite powders, sputtering and processing materials. Sections of the anode of the accelerator are made from flat pipes with outlets for feeding a working medium through the anode. The pipes are arranged with the width in a radial plane with a gap between each other and are directed along an axis. The outlets are directed an angle of less than 90° to the axis of the accelerator. The working surface of the anode is formed by ends of the outlets with openings. The bases of the pipes are hermetically connected to a collector. The collector and the inlet of the working medium are mounted on a current lead. The distance from the face of the cathode to the outlets is greater than half the diameter of the anode. A neutral shield is mounted outside the anode.

EFFECT: high efficiency of the accelerator.

6 cl, 6 dwg

FIELD: electricity.

SUBSTANCE: invention may be used mainly in straight-line vacuum arc sources of cathode plasma with microscopic particles filtration in the set with different vacuum arc evaporators and plasma conduit for plasma transportation. The anode pack comprises the anode covered by a focusing electromagnetic coil made as a pipe section. Inside the anode a deflecting electromagnetic coil is placed coaxially to it in the electroconductive housing, at that its magnet field is directed towards the focusing electromagnetic coil. Inside the deflecting coil, at the axis close to its butt end faced to input opening of the anode there is a permanent deflecting magnet, which magnet field is codirectional to the magnet field of deflecting electromagnetic coil. The anode pack is distinctive in that it includes an additional permanent magnet, which is placed inside the permanent deflecting magnet at the axis close to its butt end faced to the side opposite to input opening of the anode, and magnet field of this additional permanent magnet is opposed to the magnet field of the permanent deflecting magnet. At that positive pole of the supply source is connected electrically both to anode through winding of the focusing electromagnetic coil and to the housing of the deflecting coil through its winding.

EFFECT: ensuring dynamic balance of plasma fluxes moving in the gap between inner surface of the anode and outer surface in the housing of the deviating electromagnetic coil thus reducing plasma losses significantly.

2 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to plasma engineering and can be used in designing sources of high-intensity particle streams for scientific and engineering applications. The method of producing high-energy particle streams in gases comprises accelerating a heterogeneous stream in a de Laval nozzle. The method comprises feeding a plasma stream into the subsonic part of a de Laval nozzle, facilitating acceleration thereof to sound speed and full recombination of the plasma before the nozzle throat section and, after the nozzle throat section, feeding particles into the stream and accelerating the heterogeneous gas stream in the supersonic part of the de Laval nozzle. The apparatus for producing high-energy particle streams comprises a continuous plasma source, a de Laval nozzle and a particle input system. The apparatus further includes a high-pressure chamber, an array of N continuous microplasmatrons and a high-pressure gas supply system. The length of the subsonic part of the de Laval nozzle is defined by the condition for full recombination of the plasma before the nozzle throat section, and the particle input system provides input of particles after the nozzle throat section on the entire perimeter of the nozzle in the cross-section of the nozzle with given parameters - temperature and speed of the gas.

EFFECT: designing sources of high-intensity particle streams.

2 cl, 1 dwg

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering and particularly to electric heating of gases with an arc discharge, and can be used in plasmatrons when conducting various processes, particularly for heating molten metal in an intermediate ladle of a continuous-casting machine in the metallurgical industry, as well as scientific research of high-temperature processes. In an electric-arc plasmatron, having water-cooled cylindrical inner and coaxial outer electrodes, as well as a swirler in the annular channel in between, an arched cylindrical chamber is placed at the end of the inner electrode. The outer electrode is in the form of a cup with an expanding outlet channel at its bottom, which is connected to the cavity of the cylindrical chamber of the inner electrode through a radial gap between the end surfaces of the electrodes. The diameter of the entry section of the expanding outlet channel of the outer electrode is less than the diameter of the cylindrical chamber of the inner electrode.

EFFECT: longer service life of the plasmatron and higher current passing through the plasmatron.

1 dwg

FIELD: electricity.

SUBSTANCE: between electrodes at fixed distance from them voltage is supplied, the created current melts and evaporates thin wire located between the electrodes. Distance from the cathode to anode is selected such that discharge without wire can not occur inadvertently, and between electrodes there are conditions for avalanche breakdown of the discharge gap creating upon presence in air of the evaporated wire vapours. At that one wire end is in hole inside the cathode surface and touches it, upon voltage supply to the discharge gap from the wire and cathode surface contact point in the cathode the channel is created initiating from the contact point in direction from the connection place of the cathode with negative voltage source pole.

EFFECT: creation of channels in cathode in dependent arc discharge thus increasing efficiency of scientific researches of microelectronics technology.

2 dwg

FIELD: electricity.

SUBSTANCE: plasma is created by a plasmatron, plasma flow is created from it and acts on the material surface, the difference is that plasma is created and plasma flow is formed from it by the plasmatron with controlled parameters. Additionally the controlled flow of electromagnetic waves with frequency 0.5-5 GHz is created and directed to place of plasma flow contact with material surface. Regulation of plasmatron parameters and/or control of electromagnetic waves flow ensures and maintains the plasma temperature in its skin layer at place of the plasma contact with material surface in range 3000-5000 K.

EFFECT: increased productivity of destruction of solid dielectric bodies and expansion of scope of application.

7 cl

FIELD: process engineering.

SUBSTANCE: invention relates to treatment of materials by plasma. Proposed sprayer comprises working chamber (2) to be evacuated that accommodates substrate (3) and plasma torch (4) to generated plasma jet (5) by heating of process gas. Note here that said plasma torch (4) has atomizer (41) to force plasma jet (5) from atomizer (4) and along lengthwise axis (A) in working chamber (2). Mechanical limiter (12) can be arranged downstream of atomizer (41) in chamber (2) to extend along said axis (A) to protect plasma jet (5) against undesirable later penetration of particles.

EFFECT: higher quality.

11 cl, 5 dwg

FIELD: electricity.

SUBSTANCE: in the first version of the invention the generator cathode (1) is made as an uncooled cylinder inserted tightly to an isolator (2). In the butt end the isolator has an opening coaxial to the cathode and right up to the isolator butt end a flat metal anode (3) is installed with opening coaxial to the isolator opening thus forming a channel for an electronic beam from the cathode butt end up to the generator output. In the second version the electron beam generator comprises a discharge structure placed directly in the working gas, which consists of a cathode, and isolator and anode; the generator cathode is made as an uncooled cylinder, the butt end of the isolator is placed in the same plane with the cathode butt end, right up to the isolator butt end, coaxially with the cathode, there is a washer, which inner diameter is mode than the cathode diameter and right up to the washer there is a flat metal anode with an opening coaxial to the washer thus forming a channel for an electronic beam from the cathode butt end up to the generator output. Both in the first and second versions the cathode may be fixed in the isolator by adhesive bond far from the cathode working surface.

EFFECT: ensuring cooling of the cathode and isolator close to the beam output and reaching higher operating parameters such as gas pressure, voltage and power.

4 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to modification of polymer material surface. Control over polymer surface modification in low-temperature HV discharge plasma at lower pressures of the medium is performed by varying the discharge power. Here, discharge power is continuously measured, its current magnitude being used for calculation in real time of temperature field in discharge area. Modification termination time is defined automatically when polymer surface reaches the preset temperature (70°C for polyethylene).

EFFECT: reproducibility of the surface adhesive properties, i.e. interfacial angle and work of adhesion, as well as stable surface hydrophysics.

1 dwg, 3 tbl

Plasma accelerator // 2540140

FIELD: physics.

SUBSTANCE: plasma accelerator is designed to generate traction when moving space objects and for producing composite powders, sputtering and processing materials. Sections of the anode of the accelerator are made from flat pipes with outlets for feeding a working medium through the anode. The pipes are arranged with the width in a radial plane with a gap between each other and are directed along an axis. The outlets are directed an angle of less than 90° to the axis of the accelerator. The working surface of the anode is formed by ends of the outlets with openings. The bases of the pipes are hermetically connected to a collector. The collector and the inlet of the working medium are mounted on a current lead. The distance from the face of the cathode to the outlets is greater than half the diameter of the anode. A neutral shield is mounted outside the anode.

EFFECT: high efficiency of the accelerator.

6 cl, 6 dwg

FIELD: motors and pumps.

SUBSTANCE: metal or metalloids nanoparticles plasmajet comprises installed in series the combustion chamber, one input of which is used for entry of solid nanoparticles from metal or metalloid as fuel, and another input - for entry of a fuel oxidant - water vapour or oxygen, which being mixed in the camera burn, chemical ionisation oxydation reactions occurs, that results to heat effect, high temperatures and formation of heated plasma containing liquid oxides of metals or metalloids, the device for plasma cooling down to the temperature below the melting point of obtained oxides and formation in the heated plasma of solid dust negatively charged oxides of metals or metalloids, electrostatic or electromagnetic booster device, accelerating by electrostatic or electromagnetic field the heated plasma discharged from the cooling device and forms a high-speed flow of heated dust plasma with high-speed negatively charged oxides of metals or metalloids, which is discharged into outer environment and forms jet propulsion of the motor. The metal can be any from the series - aluminium, beryllium, zirconium, iron, titanium, metalloid - from the series - boron, silicon.

EFFECT: increase of specific impulse of the motor propulsion at the expense of complementary use of thermal energy of chemical ionisation reactions and the mass of heavier negatively charged oxides of metals or metalloids of dustlike plasma.

4 cl, 1 dwg

FIELD: engines and pumps.

SUBSTANCE: set of inventions relates to ionic engine for spacecraft and to its preparation. Said engine (1) comprises ionisation chamber (2) with high-frequency generator (4) of ionising electromagnetic field. System (7) of the charge carriers acceleration comprises shielding and accelerating grates (8) and (9), respectively. Ionic engine is equipped with neutraliser (14). High voltages for system (7) and, probably, neutraliser (14) are produced by first means (12) and taken off from circuit of generator (4). High-frequency power is supplied with the help of capacitors or inductors. Optionally, means (22) and (23) can be used for voltage rectification and smoothing.

EFFECT: simplified design, lower costs, reliable operation and minimized control costs.

12 cl, 1 dwg

FIELD: engines and pumps.

SUBSTANCE: invention relates to plasma jet engine based on Hall Effect used for driving the satellites with the help of electricity. Proposed jet engine includes the main circular ionisation and acceleration channel. Sais channel has exposed end. Engine comprises at least one cathode, circular channel, pipeline with distributor to feed ionising gas to circular channel and magnetic circuit for magnetic field generation in said main circular channel. Said node is arranged aligned with said main circular channel. Said main circular channel comprises inner circular wall section and outer circular wall section located nearby exposed outlet end. Every said section comprises stack of conducting or semiconducting plate-like rings. Plates are separated thin layers of isolating material.

EFFECT: longer life, higher power efficiency.

9 cl, 5 dwg

FIELD: engines and pumps.

SUBSTANCE: in compliance with first version, this cathode comprises electron emitting hollow elements, pipeline with channels to feed working body to said elements, common heat duct around every hollow element composed by the body of revolution. Heat duct material features heat conductivity factor not lower than that of the material of said hollow elements. Every said element is connected to separate channel of said pipeline while throttle is arranged in every channel of working body feed side. Note also that throttle orifice cross-sections are identical. In compliance with second version, said common heat duct entwines every said hollow element over its outer side and over its outlet end. Common heat duct outlet end is provided with holes, their axes being aligned with those of hollow electron emitting elements. Note also that flow sections of said holes in said common heat duct is not smaller than that in holes of said emitting electron hollow elements.

EFFECT: longer life, higher reliability, uniform distribution of working body over said elements.

4 cl, 2 dwg

FIELD: engines and pumps.

SUBSTANCE: invention can be used for tests of plasma source cathodes or those for high-current plasma engines. Proposed method comprises cathode independent fire tests. Here, cathode is switched on many times. Cathode basic degradation parameters are measured and tests are conducted at forced operating conditions. Tests are divided into steps. At every step, one of cathode degradation factors is augmented and cathode is simultaneously subjected to all other degradation factors under operating conditions. Every degradation factor is augmented at least one time.

EFFECT: accelerated test procedure, possibility to analyse the effects of every degradation factor to cathode life.

7 cl, 4 dwg

FIELD: transport.

SUBSTANCE: invention relates to jet-propelled moving facilities, predominantly in free outer space. Proposed moving facility contains body (1), payload (2), control system and at least one ring system of superconductive focusing-deflecting magnets (3). Each magnet (3) is attached to body (1) by load-bearing element (4). It is preferable to use two described ring systems located in parallel planes ("one above the other"). Each ring system is designed for long-term storage of highest-energy electrically charged particle flux (5) (relativistic proton flux) circulating in this system. Fluxes in ring systems are mutually antithetical and are inserted in these systems before flight (on launch orbit). To output of one of the magnets (3) of "upper" ring system a device (6) for part of flux (7) extraction to outer space is attached. Similarly, part of flux (9) is extracted via device (8) of one of the magnets of "lower" ring system. Fluxes (7) and (9) create jet propulsion. Devices (6) and (8) can be made in the form of deflecting magnetic system, neutraliser of flux electric charge and undulator.

EFFECT: higher energy-conversion efficiency of working medium creating thrust.

4 cl, 2 dwg

FIELD: physics.

SUBSTANCE: invention relates to beam engineering and can be used to compensate (neutralise) for spatial charge of a beam of positive ions of electro-jet engines, particularly for use in propulsion devices of micro- and nanosatellites. The method of neutralising spatial charge of an ion stream of an electro-jet propulsion device by emitting electrons through multiple autoemission sources. Sources are placed around each of the electro-jet engines of said device. Emission currents of separate autoemission sources or groups of said multiple autoemission sources are controlled independent of each other.

EFFECT: reduced consumption the working medium of an electro-jet engine, including a multimode electro-jet engine or a multi-engine apparatus, minimum time for switching to neutralisation operating mode and fast switching of electron current according to the operating mode of said electro-jet engine, optimising transfer of electrons into the neutralisation region in order to reduce divergence of the ion beam or deviation thereof, thereby changing the direction of ion thrust.

6 cl

FIELD: engines and pumps.

SUBSTANCE: invention relates to space engineering, particularly, to electric jet engines and is designed to control space craft of low thrust (up to 5 N). Cyclotron plasma engine comprises plasma accelerator housing, solenoids (inductors) and electric circuit with compensating cathodes. Note here that self-contained ion source, electron and ion flow splitter. Asynchronous cyclotron makes said plasma accelerator. Cyclotron is divided into dees by two coaxial pairs of parallel grids with clearances. Said dees make homogeneous, identical and invariable electric fields of opposite-direction of electric-field vectors. Cyclotron comprises the ferromagnetic adapters with inductors in quantity complying with the number of plasma accelerator outlet channel thrust development directions. Outlet straight gas dielectric channels of this engine communicate with said main adapters via pass electric valves. Said channels are communicated via ferromagnetic adapters wit inductors.

EFFECT: higher specific burn, decreased weight and overall dimensions, lower power consumption.

3 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: cathode (1) and anode (2) of an eroding pulse plasma accelerator (EPPA) are of flat shape. Between discharge electrodes (1 and 2) there are two dielectric pellets (4) made of ablating material. An end wall insulator (6) is installed between the discharge electrodes in the area of dielectric pellets (4) placement. An electric discharge initiator (9) is connected to electrodes (8). A capacitive storage (3) of the power supply unit is connected through current leads to the electrodes (1 and 2). The EPPA discharge channel is shaped by surfaces of the discharge electrodes (1 and 2), the end wall insulator (6) and end walls of the dielectric pellets (4). The discharge channel is made with two mutually perpendicular middle planes. The discharge electrodes (1 and 2) are mounted symmetrically in regard to the first middle plane. The dielectric pellets (4) are mounted symmetrically in regard to the second middle plane. A tangent to the surface of the end wall insulator (6) faced to the discharge channel is oriented at an angle from 87° up to 45° in regard to the first middle plane of the discharge channel. In the end wall insulator (6) there is a well with (7) a rectangular cross-section. In the well (7) from the cathode (1) side there are electrodes (8). A tangent to the front surface of the well (7) is oriented at an angle from 87° up to 45° in regard to the first middle plane of the discharge channel. The well (7) along the surface of the end wall insulator(6) has a trapezoid shape. The larger base of the trapezoid is located near the anode (2) surface. The lesser base of the trapezoid is located near the cathode (1) surface. At the end wall insulator (6) surface there are three straight-line grooves oriented in parallel to surfaces of the discharge electrodes (1 and 2).

EFFECT: increase in service life, reliability, pulling efficiency, efficiency of the working agent use and stability of the EPPA pull characteristics due to even evaporation of the working agent from the working area of the dielectric pellets.

9 cl, 3 dwg

FIELD: space engineering; ground tests and operation in space of plasma jet engines and electric jet engine plants.

SUBSTANCE: proposed method includes performance of shortened endurance tests which are part of total service life; in conducting these tests, erosion of discharge chamber (δt), change in thrust at the beginning (Fo) and in the course (ft) of shortened endurance tests are measured, regressive analysis for determination of approximating dependences is performed in form of monotonic function of erosion of discharge chamber and thrust versus time of operation; prediction of behavior of thrust is performed by definite dependence Ft=f(Fo, t), at the beginning of shortened tests and in the course of conducting these tests erosion areas (So, St) are additionally determined; approximating dependence of erosion area versus time St=f(t) and functional dependence of thrust versus erosion area F=f(k,S) are determined by regressive analysis, where k is proportionality factor between thrust and erosion area which are taken into account in prediction of thrust behavior during total service life; thrust is determined by dependence Ft=f(Fo, k,.St, So)

EFFECT: enhanced accuracy of prediction of parameters of stationary plasma jet engine.

2 dwg

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