Turbojet engine reheat unit

FIELD: mechanical engineering; turbojet engines.

SUBSTANCE: reheat unit of turbojet engine contains prechamber and central body arranged one after another indirection of flow. Prechamber is furnished with V-shaped flame stabilizer which burners are arranged, and stabilizer proper is made up of two ring segments arranged at a distance not less than maximum thickness of cross section of central body. Said central body contains fixed housing with flat surfaces from both sides and flat deflecting panels in contact with flat surfaces, thickened inlet part rounded off in cross section and wedge-like outlet part. Wedge-like outlet part and contacting flat surfaces of housing and deflecting panels are coated with radio absorbing material. Flat panels and their hinge joints connecting them with central body housing are made hollow, and they are driven from both sides through hollow springs. Fixed hollow cylindrical rod is arranged inside hollow of each panel. Outer surface of said rod is slide-fitted with inner surfaces of hollow hinge joint. Ends of each hollow cylindrical rod pass inside hollow springs, pylons and are connected with cooling air supply pipelines through side holes in reheat unit wall. Hinge joints and cylindrical rods are provided with two rows of through holes arranged at angle relative to each other so that in nondeflected initial position of panels, holes in rods and hinge joints register in front rows in direction of flow and do not coincide in rear rows, and vise versa, in deflected positions of panels, holes coincide in rear rows and do not coincide in front rows. Inner space of each flat panel is connected at one side through holes with inner space of reheat unit, and at other side, with panels deflected, is connected through registered holes in rod and hinge joint, with inner space of cylindrical rod. Thin-walled streamlined screen is made lengthwise outer surface of hinge joint of each panel. Said screen forms inner space between screen and outer surface of hinge joint. Said space is connected inner space of cylindrical rod through registered holes of front rows of rod and hinge joint when panels are in not deflected initial position, and opposite edges of each flat panel in direction from hinge joint is made in form of ellipse, and at deflection of panels, projection of both panels onto plane of cross section reheat unit is screen in form of circle.

EFFECT: improved reliability of reheat unit, reduced level of infra-red radiation in rear semi-sphere of engine.

8 dwg

 

The invention relates to the field of aircraft engine industry, in particular to the afterburner combustion chambers.

Known afterburner combustion turbine engine containing outer wall and successively, in the direction of flow, located front-line device with a V-shaped flame stabilizer and the Central body within the V-shaped flame stabilizer placed the burner, and the stabilizer is made of two ring segments located in front of the Central body in the corresponding semicircle cross-section afterburners and spaced from each other at a distance not less than the maximum thickness of the cross-section of the Central body, the Central body fixed on the wall of the afterburner through a streamlined shape of the piers, connected with the piping of the cooling air contains a fixed housing having flat surfaces on both sides of and in contact with the flat reject panel thickness rounded in cross section of the inlet and wedge-shaped output part, reject panel its front side is fixed on the input side of the hull to give a streamlined shape of the Central body and through a swivel connected with the actuator for deflecting them from contacting flat surfaces of the body, wedge-shaped wychodzacymi and contacting the flat surface of the chassis and engine panels covered with radar absorbing material (see Patent of Russia №2258830, IPC 7 F02K 3/10, 13.01.2004,).

However, having to reject panels in the flowing part of bulky articulated lever system leads to increased losses of total pressure in the afterburner, and hence to an increase in specific fuel consumption of the engine as a whole. The flow of cooling air through the holes in the flat walls of the Central body almost does not cool the flat panels in the deflected state, and thereby reduces their reliability and reduces the effect of reducing the level of infrared light in the rear hemisphere of the engine.

The objective of the invention is to achieve the optimal combination of reliable operation of the afterburner, the magnitude of hydraulic losses and efficiency reduce the level of infrared light in the rear hemisphere of the engine.

This technical result is achieved by the fact that the afterburner combustion chamber of a turbojet engine includes an outer wall and successively, in the direction of flow, located front-line device with a V-shaped flame stabilizer and the Central body within the V-shaped flame stabilizer placed the burner, and the stabilizer is made of two ring segments spaced from each other at a distance not less than the maximum thickness of the cross-section of the Central body, the Central t is lo pinned on the wall of the afterburner through a streamlined pylon, connected with the piping of the cooling air contains a fixed housing having flat surfaces on both sides and in contact with the flat reject panel thickness rounded in cross section of the inlet and wedge-shaped output part, reject panel its front side is fixed on the input side of the casing through a swivel to give a streamlined shape of the Central body and connected with the actuator for deflecting them from contacting flat surfaces of the body of the sphenoid output part and contacting the flat surface of the housing deny panels covered with radio absorbing material, with flat panels made hollow and the drive is carried out from both end sides of the through hollow springs, passing through the side holes in the wall afterburners and pylons, each spring one of its end connected to the actuator, e.g. a hydraulic cylinder, and the other, for example, via a splined connection with the mating bracket fixed on the end side panel, inside the hollow swivel each panel is placed stationary hollow cylindrical rod, the outer surface on which the mobile landing paired with the inner surface of the hollow swivel, the ends of each hollow is a cylindrical rod are hollow inside of the springs, pylons and through the side openings in the wall of the afterburner connected to the piping for supplying the cooling air taken, for example, from a compressor of the engine, with swivel and a cylindrical rod across the width deny panels with two rows of through holes arranged at an angle to each other so that when netcontrol the initial position of the panel hole rod and swivel match the front rows, but when the deflected position of the panels - rear rows, the inner cavity of each flat panel on one side through the through-hole is made on the inner surface and radar absorbing material, is connected with the inner cavity afterburner, and on the other hand, when the deflected position of the panels are connected through matching holes in the rod and a swivel with an internal cavity of the cylindrical rod, in addition, on the outer surface of the hinge connection of each bar in the whole of its width made of thin-walled screen streamlined shape with the formation of the internal cavity between the screen and the outer surface of Sarmanovo connection, which is connected with netcontrol the initial position of the panels through the matching holes in the rod and swivel with the internal cavity cylindricality, and in the opposite direction from the swivel edge of each flat panel is made in the form of an ellipse, and when the deviation of the projection panels both panels on the cross section plane of the camera represents the screen in the form of a circle.

The invention is illustrated by drawings.

Figure 1 presents the incision afterburner combustion turbine engine in the original not the deflected position of the flat panels of the Central body.

Figure 2 presents the element "A" afterburners on an enlarged scale, illustrating a supply of cooling air to the Central body and the actuator deflection flat panel hollow springs through a spline connection with the mating brackets fixed on the lateral sides of the flat panel.

3 shows the side view cut afterburners in the initial position deviated by the flat panels of the Central body.

4 shows side view cut afterburners on the official position of the flat panels of the Central body.

Figure 5 presents the element "B" figure 4 the input side of the flat body in the initial position deviated by flat panels explaining the relationship of the internal cavities of cylindrical rods and hollow hinge with internal cavities between screens and external surfaces of the swivel and PU is ü admission of cooling air for cooling the Central body.

Figure 6 presents the item "G" 5 input side of the flat body in the deflected position flat panels explaining the relationship of the internal cavities of cylindrical rods and hollow hinge with internal cavities of the hollow panels and the path admission of cooling air through the holes on the inner walls of the panels and through the holes on radar coatings to the inner cavity afterburner.

Figure 7 presents a view along arrow "B" figure 3 afterburning combustion chamber illustrating the location of the annular segments of the V-shaped flame stabilizer and the Central body pillars relative to each other in the initial position of the panels.

On Fig presents a view along arrow "D" figure 4 afterburner combustion chamber illustrating the location of the projection of flat panels on a cross-section of the afterburner combustion chamber when the deviation of the panels at a given angle from its original position with the formation of the mask screen in the form of a circle.

Afterburner chamber turbojet engine includes an outer wall 1, a front-line unit with a V-shaped stabilizer 2 flame, the Central body 3, the burner 4, placed in the annular segments 5 of the stabilizer 2 flame, pylons 6, line 7 for supplying cooling air, the body 8 of the Central body with the flat surfaces 9, flat deny the Annelie 10 with thickened rounded shape at the input 11 and the wedge output 12 parts and swivel 13, associated with the actuator 14 of the deflection panels, radar absorbing material 15, the sides 16 of the panels, hollow springs 17, the hydraulic cylinders 18, splined connection 19, the brackets 20, a cylindrical hollow rod 21, the rows of through holes 22, 23 on the hinge joints 13 and 24, 25 on the hollow cylindrical rod 21, the inner cavity 26 of flat panels, through holes 27 on the inner surfaces of the panels and 28 - on the radio-absorbing material, the internal cavity afterburner 29, thin screens 30, the internal cavity 31 between screens and external surfaces of the swivel, the opposite edges 32 panels and the projection of the two panels on the cross section plane of the camera, forming a masking screen 33 in the form of a circle.

When the engine operating conditions, the cooling air taken, for example, from a compressor of the engine, to line 7 is supplied to the hollow cylindrical rod 21. When the original netcontrol position flat hollow panel 10 from the flat surfaces 9 of the fixed body 8 of the Central body 3, is fixed by means of pylons 6 on the outer wall 1 afterburners, the front rows of holes 22 in the rods 21 coincide with the front rows 24 of the hollow hinge joints 13, the cooling air from the inside of the cylindrical the rod 21 is supplied into the inner cavity 31 of thin screens 30 and flowing and cooling the outer surface of the Central body 3, enters the afterburner combustion chamber, mixes with the gases in the combustion chamber and through the output device is released into the atmosphere.

On the modes of low visibility, when you want to reduce the level of infrared radiation and radar reflection, when entering from the control system (in the drawing conventionally not shown) of the control signal to the hydraulic cylinders 18, the cylinders 18, moving, rotate the actuator 14, which through the spline 19 turn the brackets 20, secured to the sides 16 of the panels 10, reject them at the required angle. The required angle is determined by calculation or by experiment of the conditions for obtaining an acceptable loss of the total pressure in the chamber and providing at the same time effectively reduce the level of infrared radiation and radar reflection in the rear hemisphere of the engine. When turning on the required angle from the original position of the flat panel 10 from the housing 8 of the Central body 3 in the opposite direction from the hinge connection 13 curved edge 32 in the form of an ellipse panels 10 form a masking screen 33 in the form of a circle. At the same time when the deviation of the required angle of the panels 10 in the rear rows of holes 23 in the rods 21 coincide with the rear rows of 25 hollow is arnerich compounds 13 and the cooling air from the internal cavity of the cylindrical rod 21 is supplied into the inner cavity 26 of the panels 10 and further through the through 27 on the inner surfaces of panels 10 and through apertures 28 on the radio absorbing material 15 cools the flat panel 10, gets into the afterburning chamber, forms a protective layer of cold air near the panels 10, is mixed with the gases in the afterburner combustion chamber and through the output device is released into the atmosphere. Thus, the interaction of the cooled surfaces of the panels 10 forming a masking screen 33 in the form of a circle and leaving them cold air, close the visibility of the hot parts of the engine from the rear hemisphere of the engine to reduce the level of infrared radiation. When the occurrence of the radar signal from a locator from the rear hemisphere of the engine, he gets on the radio absorbing material 15 deposited on the flat surfaces of the panels 10, wedge-shaped outlet part 12 and the contacting flat surfaces 9 of the housing 8 of the Central body 3, and if they are not absorbed completely, already weakened signal, repeatedly hitting and Bouncing off of radar absorbing material on the panels 10, the flat surfaces 9 and wedge-shaped outlet part 12, structurally located at angles to each other, completely extinguished and will not be returned by the locator.

In cases where the reduction of infrared radiation and radar reflectivity is not required, the actuator 14 actuate hollow springs 17, flat-panel back in is the same position, forming together with the input and wedge-shaped output parts 11 and 12 and the housing 8 streamlined Central body 3 with the supply of cooling air on the outer surface and the engine is running as usual on all other operating modes.

The implementation of the actuator flat deviated from both sides through the hollow springs can be derived from a gas stream flowing part of the combustion chamber articulated lever drive device, to reduce hydraulic losses in the chamber and thereby to improve the specific parameters of the engine.

Run flat deny panels and their hinged connections with the hollow body and the inside of the hollow swivel each panel stationary hollow cylindrical rod allows to draw cooling air from the internal cavity of the cylindrical rods or in the internal cavity formed by thin screens and the outer surface of the hinge joints at the source netcontrol the position of the panels, or when the deflected position of the panels through the through holes on the inner surfaces and radio absorbing material with an internal cavity afterburner that allows you to draw cooling air or cooling of the Central body at the position of the panel in the original position, or when otklonen the m position of the panels to further cool them and to create the curtain of cooling air behind the panels on the thread which ultimately increases the efficiency of the protection device and reduces the level of infrared light in the rear hemisphere of the engine.

Performing the opposite edges in the direction from the hinge connection of flat panels in the form of the ellipse gives the streamlined shape of the Central body when the original netcontrol the position of the panels, which reduces hydraulic losses tract camera and mass, and when the deviation of the panels at a given angle projection of both panels in a cross section plane of the camera forms a masking screen in the form of a circle that can virtually block all semblance of hot parts of the engine from the rear hemisphere of the engine, thereby to reduce the level of infrared radiation and thus to form around him annular channel for gas flow.

This embodiment of the afterburner combustion chamber of a turbojet engine with a masking screen by combining its functions with the use of radar absorbing material and the simultaneous flow of cooling air provides an effective reduction in the level of infrared radiation and radar reflection in the rear hemisphere of the engine, and hence the simultaneous optimal combination of reliable operation of the afterburner combustion chamber, the improvement of specific parameters, lower values of hydrauli the definition of losses and weight of the engine as a whole.

Afterburner combustion chamber of the turbojet engine, containing an outer wall and consistently in the direction of flow located front-line device with a V-shaped flame stabilizer and the Central body within the V-shaped flame stabilizer placed the burner, and the stabilizer is made of two ring segments spaced from each other at a distance not less than the maximum thickness of the cross-section of the Central body, the Central body fixed on the wall of the afterburner through a streamlined shape of the piers, connected with the piping of the cooling air taken, for example, from a compressor of the engine, includes a fixed housing having flat surfaces on both sides and in contact with them flat reject panel thickness rounded in cross section of the inlet and wedge-shaped output part, reject panel its front side is fixed on the input side of the casing through a swivel to give a streamlined shape of the Central body and connected with the actuator for deflecting them from contacting flat surfaces of the body of the sphenoid output part and the contacting flat surface on the chassis and engine panels covered with radio absorbing material, with flat panel and swivel with building the com Central body is made hollow and the drive is effected from both sides through the hollow springs, which pass through the side holes in the wall of the afterburner, and pylons, and are connected to one ends with an actuator such as a hydraulic cylinder, and the other, for example, via a splined connection with the mating brackets fixed on the side panels, inside the hollow swivel each panel is placed stationary hollow cylindrical rod, the outer surface on which the mobile landing paired with the inner surface of the hollow swivel, the ends of each hollow cylindrical rod are hollow inside springs, pylons and through the side openings in the wall of the afterburner connected to the piping for supplying cooling air, with swivel and cylindrical rod length equal to the width deny panels, equipped with two rows of through holes arranged at an angle to each other so that when netcontrol the original position of the holes in the rods and hinge connections match the front in the direction of flow lines, and the rear is not the same, and Vice versa, when the deflected position of the panel holes are the back rows, but the front is not the same, the inner cavity of each flat panel on one side through the through-hole is made on the inner surface the STI and radio absorbing material, connected with the inner cavity afterburner, and on the other hand, when the deflected position of the panels are connected through matching holes in the rod and swivel with the internal cavity of the cylindrical rod, in addition, on the outer surface of the hinge connection of each panel along its length made of thin-walled screen streamlined shape, forming an internal cavity between the screen and the outer surface of the swivel, which is connected with netcontrol the initial position of the panels through the matching front rows of holes in the rod and swivel with the internal cavity of the cylindrical rod, and in the opposite direction from the swivel edge of each flat panel is made in the form of an ellipse, and when the deviation of the projection panels both panels on the cross section plane of the camera represents the screen in the form of a circle.



 

Same patents:

FIELD: mechanical engineering; turbojet engines.

SUBSTANCE: reheat unit of turbojet engine contains prechamber and central body arranged one after another indirection of flow. Prechamber is furnished with V-shaped flame stabilizer which burners are arranged, and stabilizer proper is made up of two ring segments arranged at a distance not less than maximum thickness of cross section of central body. Said central body contains fixed housing with flat surfaces from both sides and flat deflecting panels in contact with flat surfaces, thickened inlet part rounded off in cross section and wedge-like outlet part. Wedge-like outlet part and contacting flat surfaces of housing and deflecting panels are coated with radio absorbing material. Flat panels and their hinge joints connecting them with central body housing are made hollow, and they are driven from both sides through hollow springs. Fixed hollow cylindrical rod is arranged inside hollow of each panel. Outer surface of said rod is slide-fitted with inner surfaces of hollow hinge joint. Ends of each hollow cylindrical rod pass inside hollow springs, pylons and are connected with cooling air supply pipelines through side holes in reheat unit wall. Hinge joints and cylindrical rods are provided with two rows of through holes arranged at angle relative to each other so that in nondeflected initial position of panels, holes in rods and hinge joints register in front rows in direction of flow and do not coincide in rear rows, and vise versa, in deflected positions of panels, holes coincide in rear rows and do not coincide in front rows. Inner space of each flat panel is connected at one side through holes with inner space of reheat unit, and at other side, with panels deflected, is connected through registered holes in rod and hinge joint, with inner space of cylindrical rod. Thin-walled streamlined screen is made lengthwise outer surface of hinge joint of each panel. Said screen forms inner space between screen and outer surface of hinge joint. Said space is connected inner space of cylindrical rod through registered holes of front rows of rod and hinge joint when panels are in not deflected initial position, and opposite edges of each flat panel in direction from hinge joint is made in form of ellipse, and at deflection of panels, projection of both panels onto plane of cross section reheat unit is screen in form of circle.

EFFECT: improved reliability of reheat unit, reduced level of infra-red radiation in rear semi-sphere of engine.

8 dwg

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