Method of moving flow impact on screw of wind or hydraulic motor, and device for its implementation

FIELD: power industry.

SUBSTANCE: in method of moving flow impact on screw of wind or hydraulic motor the kinetic energy of moving flow having constant velocity is converted to alternating pulse flow that is applied to the screw at transient processes, at occurrence of inertia properties of the flow, at mechanical resonance. In the device implementing the above method the smallest section of pipe channel 4 arranges slot-screw group consisting of coaxial slot-type fairing disc 1 with fairings, control slot-type disc 2 and screw 3. When the slots are fully open, screw 3 blades form together with fairings a wing airfoil. Slot-screw group for control of screw 3 rotation frequency changes the size of slots by rotating control slot-type disc 2.

EFFECT: increasing the conversion efficiency of kinetic energy of moving constant flow to mechanical energy of rotating screw.

2 cl, 11 dwg

 

The technical field.

The invention relates to wind and water engines that convert the kinetic energy of the moving continuous flow of gas or fluid with constant velocity, the kinetic energy of the moving mass of the screw.

The level of technology.

Known wind turbine forced formation of rolling screw with constant air flow, which is achieved by limitation and concentration of the flow pipe and placement of the screw within the tube.

The closest analogue is the wind power installation [(19) RU (11) 2103545 (13) C1. (51) 6 F03D 1/02]containing a wind tunnel lowest round cross-section where the propeller. The disadvantage of this method is the low efficiency of energy conversion thread. A disadvantage of the known device is incomplete selection of the capacity of the stream, despite the forced concentration through the wind tunnel. In addition, at low flow speed torque screw insufficient to overcome the static moment of resistance mechanisms to load in the start-up phase ("breakaway").

The objective of the invention is the increased efficiency of conversion of kinetic energy of a moving continuous flow into mechanical energy of the rotating screw. Improved starting qualities Vetra the s and water engines.

Disclosure of the invention.

Moving steady flow with constant speed, is converted into AC pulsed flow, which in turn affects the screw. The flow transformation is carried out using scale-coil group in a wind tunnel, which, in addition to functions of the form control flow, allows you to concentrate and regulate the power flow. It is known that the amount of energy absorbed by the propeller is proportional to the magnitude of the change of the flow velocity or the change in dynamic pressure of the flow when the flow passes through the screw:

where ΔΕ is the amount of energy taken by a screw, j;

ν1, ν2the magnitude of the flow velocity in front of the screw and screw respectively, m/s;

m is the mass flow passing through the screw, kg;

Whence we obtain:

where ΔΕ is the amount of energy taken by a screw, j;

Δp is the change in dynamic pressure of the flow, when the flow passes through the screw, PA;

ν1, ν2the magnitude of the flow velocity in front of the screw and screw

accordingly, m/s;

ρ is the density value of the environment, which consists of the stream, kg/m3;

Screw in the wind tunnel (prototype), at a constant flow will get the following equation:

The magnitude of the dynamic the ski pressure flow before the screw will be

where p1the value of the dynamic pressure of the flow in front of the screw, PA;

ρ is the density of the medium flow (in this case air density),

ν1the flow velocity in front of the screw, m/s;

The value of dynamic pressure for the screw will be

where R2the value of the dynamic pressure of the flow behind the propeller, PA;

ρ is the density of the medium flow (in this case air density),

- flow speed for the propeller, m/s;

pthe WPPT.the magnitude of the vacuum generated by the diffuser pipe (depending on the design, vacuum tubes and other), PA.

Then the change in dynamic pressure when the flow passes through the screw will be

For a pulse method of energy conversion thread will get the following equation:

The value of the dynamic pressure of the pulse stream before screw:

where Rinert.- dynamic pressure due to the inertial properties of the medium, reflected in the rapid deceleration of the flow, resulting in the overlap of the slits of the front surfaces of the screw, PA;

where Finert.- the inertial force of the flow, disturbance is surrounding with the rapid overlapping slits, N;

S1- the area of the smallest cross section of the wind tunnel, m2;

- the value of the acceleration of deceleration of the flow, while overlapping slots;

Then the value of the dynamic pressure of the flow before the screw will be

The value of dynamic pressure behind the jet is described by the equation

The pulse unit is based on the use of transient processes. Therefore, the continuous traffic flow in savinovo part of the tube is missing, and is periodic inertial motion of the flow, which allows you to create additional pressure for the screw. Nominal frequency of rotation of the rotor time unlocking cracks a little. The stream strikes the blades, after which the cracks again overlap. Exhaust flow from the propeller blades moves by inertia (because the slit is blocked) and under the action of vacuum generated by the diffuser. In the next phase of unlocking slots has the following aerodynamic pattern: before you screw the pressure of the stream is represented by a dynamic pressure and inertial pressure (the result of the previous cut-off flow), with the screw there is a vacuum created by the diffuser and exhaust flow moving along inerlite way on the sides of the screw creates maximum pressure difference, the considerably large differences dynamic pressures occurring under the action of a constant thread of the screw:

or

Comparing equations (4.5.) and (4.12.) it is seen that the difference in dynamic pressure impulse installations greater than the difference of the dynamic pressure for the installation of permanent flow, and, therefore, more efficiency and better starting characteristics. In addition, the inertial properties of the medium (especially for environments with a high density of matter), which manifests itself in the operation of a pulse installation, allow, at a certain rotational speed of the screw, to use the phenomenon of mechanical resonance, which further increases the efficiency of the device.

The use of transient processes in pulse installation will not cause acoustic pollution for the reason that when working SVG elastic properties of the medium do not appear or are manifested, is small (negligible). The manifestation of the elastic properties of the medium largely possible only if the critical speed of the screw, when the installation is "Hawking". To prevent such modes in the design MUG provided for managing slotted disk, by turning which inalsa aperture size and accordingly the rotational speed of the screw.

The task of raising the efficiency of conversion of kinetic energy of a moving continuous flow in wind turbines, hydroelectric plants, nuclear, thermal, mechanical energy of the rotating screw is solved by converting the constant flow of AC pulse stream and the subsequent impact on the screw AC pulse flow during transients, when the inertial properties of the flow, when the mechanical resonance. The difference of the dynamic pressure of the flow, which determines the amount of energy taken by screws, in a pulse stream at a much higher difference in dynamic pressure constant flow, which can be seen from equations (4.5), (4.12). Device for pulse energy conversion thread is a good starting quality. In the lowest section of the channel pipe is placed sale-coil group comprising spaced coaxial slotted disc fairing, managing slotted disk and propeller, the blades of which when fully open cracks with fairings form the aerodynamic profile of the wing. In sale-screw group of the screw exposed to pulses of flow, which is especially effective at the moment of starting the installation. In addition to increasing efficiency and improving starting characteristics, the proposed design contains a number of additional advantages. Screw installation completed without moving pair is tions, the construction is simple and reliable. Speed screw is adjusted managing a slit disk by changing the bandwidth of cracks. Since the area of the slits 50% of the area of the smallest cross-section of the pipe, the flow velocity is additionally increased by 2 times, without the need to increase the input section of the pipe (in comparison with the prototype). Accommodation DUG in the pipe protects the structural elements from atmospheric precipitation (rain, ice and so on). Accidental destruction of the screw pipe protects others from scattering of fragments. With full overlap of the slits managing a slit disk in the pipe are safer and more comfortable conditions for repair, compared with a wind turbine without a pipe; compared with the prototype, where the repair is only possible in calm, because otherwise the repair should be performed on the wind, the strong confuser pipe.

Description of the drawings

1. Figure 1. - General view of the plant designed for pulsed convert the kinetic energy of a moving continuous flow in the kinetic energy of the rotating mass. Scheme.

2. Figure 2. Cut levintova group.

3. Figure 3. - Slotted drive-fairing. Frontal view. Zatserkovny fairings.

4. Figure 4. - Slotted drive-fairing. View from position "A" figure 3.

5. Figure 5. - Managing slotted disk. Frontal view. C is tolerowany blades Manager slotted disk.

6. 6. - Managing slotted disk. View from the top.

7. 7. - Screw. Frontal view. Zatserkovny front flat surface of the blades.

8. Fig. - Screw. View from the top.

9. Fig.9. The layout SVG at the moment fully open slits.

10. Figure 10. The layout SWG at the time open (50%) of cracks.

11. 11. The layout SVG at the moment fully closed slits.

The implementation of the invention.

Moving the thread with constant speed, is converted into AC pulsed flow, which in turn affects the screw. The flow transformation is carried out using scale-screw group (SWG) (figure 1). SVG consists of a stationary slotted disc Radome 1, rolling managing slotted disk 2 and the screw 3, and is located in the smallest circular cross-section, oriented in the direction of the external constant flow, wind tunnel 4, which has the confuser and diffuser containing vacuum tube 5. The input and output sections of the pipe are equal. Cut the blades of each of the elements SVG presented in figure 2. Elements MUG made of polymeric materials, in order to reduce their weight. Slotted drive-fairing (figure 3, figure 4.) is placed in the pipe is stationary and is in the design of segmental slots 6, number 4, and segmental fairings 7, the Islom, equal to the number of slits. The cross-section of the fairing is a semicircle with a radius increasing from the center of the disc. Managing movable slotted disk (figure 5, 6.) is placed in the tube slot disk Radome in a special groove and is able to rotate about its own axis. Managing movable slotted disk has the number and size of the slits 8, equal to the number and size of slots of a slotted disc fairing. Screw (Fig.7, Fig) is placed in the pipe for moving the managing slit disk by mounting on the primary shaft of the transmission and has blades, the number equal to the number of slits in the slit disk-fairing. The front part of the blades are flat, the flat projection in front of the propeller blades has a segmental shape identical to the shape of the segmental slots of a slotted disc fairing. Elements SVG are aligned.

The device operates as follows. Mode selection maximum power gap control disk are located exactly opposite the slots of a slotted disk-fairing (Fig.9.). A constant stream of concentrated confused part of the pipe, passes through the slit and directly affects the working part of the blade screw. The screw rotates (figure 10) and the planar front portions of the blades completely overlaps the slit, resulting in a flow cut off (figure 1). The dynamic pressure of the flow in the confused part of the tube becomes static and has a maximum value. In savinovo part of the tube, the flow velocity is close to zero and the vacuum tubes in the walls of the diffuser and the diffuser. Next time, screw inertia rotates and unlocks the cracks. Because the sides of the screw is at the maximum pressure difference, the pulse stream has a maximum energy and acting directly on the propeller blades, fully conveys the energy to the screw. As the impact on the screw is a pulse stream, the system has a good starting quality even at low flow velocities. In case of an inadmissible increase of the flow velocity control disc by means of an automatic control system is turned, resulting in the aperture size is reduced up to a full overlap. Thus, it is effective, accurate and safe control of the stream.

1. The method of action of a moving stream of the propeller wind or hydraulic motor, characterized in that the kinetic energy of a moving stream with a constant speed, is converted into an AC pulse stream and affect the screw variable pulse flow during transients, when the inertial properties of the flow, the ri of the mechanical resonance.

2. The device for exposure of a moving thread on the screw wind or hydraulic containing a wind tunnel with confusio-diffuser channel, characterized in that at least the section of the channel pipe is placed sale-coil group comprising spaced coaxial slotted disc fairing with fairing, managing slotted disk and propeller, the blades of which when fully open cracks with fairings form the aerodynamic profile of the wing, which is for adjusting the frequency of rotation of the screw adjusts the size of the gaps by turning the control of a slotted disk.



 

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