Visual testing device for combustion stability of afterburner

Abstract

The invention belongs to the technical field of visualization of combustion test devices, and particularly relates to a combustion stability visualization test device for an afterburner. Comprising a combustion chamber testing device body, a first valve port, a second valve port, a fuel oil guide pipe and an observation frame, wherein the first valve port and the second valve port are fixedly arranged on the combustion chamber testing device body; the fuel oil guide pipe is fixedly arranged on the combustion chamber testing device body; the internal quartz glass and the external quartz glass are fixedly installed on the observation frame, the cleaning frame is fixedly installed in the observation frame, and the cleaning mechanism comprises an air inlet pipe fixedly installed on the inner wall of the combustion chamber testing device body; through cooperation of the structures, the cleaning rod can scrape and clean dust and impurities on the outer wall of the internal quartz glass, so that the situation that visualization is affected is avoided, stable collection of experimental data and accuracy of data collection are guaranteed, and the overall quality of the test is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of visualization of combustion test devices, and particularly relates to a visualization test device for the combustion stability of an afterburner. Background Technique

[0002] The afterburner is a key component in a gas turbine engine, mainly used to significantly increase the engine thrust in a short time. It is commonly found in military fighter jets and high-performance supersonic aircraft. Its core principle is to inject fuel into the high-temperature airflow behind the turbine or fan for secondary combustion, and by releasing additional heat energy, the exhaust speed is greatly increased, thereby obtaining short-term power enhancement.

[0003] During the combustion process, the generated soot particles will diffuse with the high-temperature airflow and gradually deposit on the surface of the transparent window of the observation system. The continuous attachment of such particles will significantly weaken the light transmission performance of the window, forming an optical pollution layer. As the transmittance decays, the observation system will face double interference: on the one hand, when observing through the optical window with the human eye, the flame shape and flow field characteristics will be blurred and distorted due to the light scattering effect; on the other hand, systematic errors will occur in the data collected by precision instruments such as high-speed photography and laser diagnosis, which may ultimately lead to a decrease in the reliability of the combustion stability analysis, directly affecting the scientific value and engineering guiding significance of the test results.

[0004] Therefore, the present invention provides a visualization test device for the combustion stability of an afterburner. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background technique.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a visualization test device for the combustion stability of an afterburner according to the present invention includes a combustion chamber test device body, a first valve port and a second valve port fixedly installed on the combustion chamber test device body, a fuel conduit fixedly installed on the combustion chamber test device body, an observation frame fixedly installed on the combustion chamber test device body, an internal quartz glass and an external quartz glass fixedly installed on the observation frame, a cleaning frame fixedly installed inside the observation frame, a cleaning mechanism provided inside the cleaning frame for wiping the surface of the internal quartz glass, and a control mechanism provided inside the cleaning frame for multiple automatic cleanings;

[0007] The cleaning mechanism includes an air inlet pipe fixedly installed on the inner wall of the combustion chamber test device body, a limiting rod fixedly installed inside the cleaning frame, a limiting plate fixedly installed inside the cleaning frame, an air inlet hole opened on the limiting plate, a slide rail fixedly installed inside the cleaning frame, a slider slidably installed on the slide rail, a memory tension spring sleeved on the limiting rod, and a cleaning rod fixedly installed at the bottom of the slider. A sliding groove for the cleaning rod to slide is opened inside the cleaning frame.

[0008] The air inlet pipe penetrates through the inner wall of the combustion chamber test device body and is fixedly communicated with the cleaning frame. The limiting rod penetrates through the limiting plate, and the slider is in contact with the inner wall of the cleaning frame.

[0009] One end of the memory tension spring is fixedly connected to one side of the limiting plate, and the other end of the memory tension spring is fixedly connected to one side of the slider.

[0010] The control mechanism includes a plug plate slidably installed inside the cleaning frame, a connecting rod fixedly installed at the bottom of the plug plate, a control plate fixedly installed at the end of the connecting rod away from the plug plate, a control rod fixedly installed on the slider, an exhaust groove opened inside the cleaning frame, and an exhaust pipe fixedly installed on the observation frame.

[0011] The side surface of the plug plate is in contact with the inner wall of the cleaning frame. The control rod penetrates through the limiting plate, and the end of the control rod away from the slider is in contact with one side of the plug plate.

[0012] A fixing plate is fixedly connected inside the observation frame. One side of the fixing plate is fixedly connected with a first telescopic plate, and the movable end of the first telescopic plate is fixedly connected with one side of the slider.

[0013] The first telescopic plate is arranged inside the sliding groove. A second telescopic plate is fixedly connected inside the sliding groove, and the movable end of the second telescopic plate is fixedly connected with the side of the slider away from the first telescopic plate.

[0014] A fuel nozzle is fixedly connected inside the combustion chamber test device body, and the fuel nozzle is arranged below the fuel conduit.

[0015] A flame tube is fixedly connected to one side of the fuel nozzle, and a swirler is fixedly connected to one side of the flame tube.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. A visualization test device for combustion stability of an afterburner. Through the setting of a cleaning mechanism, the high-pressure gas generated by combustion enters the interior of the moving chamber through the air inlet hole. The memory spring is heated by the high-pressure gas and becomes soft, causing its pulling force to decrease. At the same time, there will be a pressure difference on both sides of the slider. Under the action of the pressure difference, the slider is pushed and moves along the slide rail. The slider drives the cleaning rod to move synchronously. The cleaning rod closely adheres to the surface of the internal quartz glass, thereby achieving the effect of scraping and cleaning the dust and impurities on the outer wall of the internal quartz glass, avoiding the occurrence of situations that affect visualization, ensuring the stable collection of experimental data and the accuracy of data collection, and improving the overall quality of the test.

[0018] 2. A visualization test device for combustion stability of an afterburner. Through the setting of a control mechanism, when the temperature of the moving chamber drops, the memory spring becomes hard and the pulling force increases, pulling the slider and the control rod fixedly installed thereon in the opposite direction synchronously. The control rod passes through the limit plate and pushes open the plug plate until the plug plate returns to its initial position. At this time, the intake chamber and the moving chamber are connected again through the air inlet hole. The slider separates the interior of the moving chamber and the observation frame again. In this way, it can be reciprocated to achieve automatic scraping and cleaning of the outer wall of the internal quartz glass back and forth. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the drawings.

[0020] Figure 1 is the front view of the present invention;

[0021] Figure 2 is the cross-section Figure 1 ;

[0022] Figure 3 is the cross-section Figure 2 ;

[0023] Figure 4 is Figure 3 the partial enlarged view at A in

[0024] Figure 5 is the structural schematic diagram of the cleaning frame in the present invention;

[0025] Figure 6 is Figure 5 the partial enlarged view at B in

[0026] Figure 7 is Figure 5 the partial enlarged view at C in

[0027] Figure 8 is the structural schematic diagram of the internal quartz glass in the present invention;

[0028] Figure 9 It is a schematic structural diagram of the cyclone in the present invention.

[0029] In the figure:

[0030] 1. Combustion chamber test device body; 2. First valve port; 3. Second valve port; 4. Fuel conduit; 5. Observation rack; 6. Internal quartz glass; 7. External quartz glass; 8. Cleaning rack; 9. Air inlet pipe; 10. Limit rod; 11. Limit plate; 12. Air inlet hole; 13. Slide block; 14. Memory tension spring; 15. Cleaning rod; 16. Slide rail; 17. Plug plate; 18. Connecting rod; 19. Control board; 20. Control rod; 21. Exhaust groove; 22. Exhaust pipe; 23. First telescopic plate; 24. Fixed plate; 25. Second telescopic plate; 26. Fuel nozzle; 27. Flame tube; 28. Cyclone. Specific embodiments

[0031] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0032] Refer to Figure 1 - Figure 9 , the present invention provides three technical solutions:

[0033] Embodiment 1:

[0034] It includes a combustion chamber test device body 1, a first valve port 2 and a second valve port 3 fixedly installed on the combustion chamber test device body 1, a fuel conduit 4 fixedly installed on the combustion chamber test device body 1, an observation rack 5 fixedly installed on the combustion chamber test device body 1, an internal quartz glass 6 and an external quartz glass 7 fixedly installed on the observation rack 5, a cleaning rack 8 fixedly installed inside the observation rack 5, a cleaning mechanism arranged inside the cleaning rack 8 for wiping the surface of the internal quartz glass 6, and a control mechanism arranged inside the cleaning rack 8 for multiple automatic cleanings;

[0035] The cleaning mechanism includes an air inlet pipe 9 fixedly installed on the inner wall of the combustion chamber test device body 1, a limit rod 10 fixedly installed inside the cleaning rack 8, a limit plate 11 fixedly installed inside the cleaning rack 8, an air inlet hole 12 opened on the limit plate 11, a slide rail 16 fixedly installed inside the cleaning rack 8, a slide block 13 slidably installed on the slide rail 16, a memory tension spring 14 sleeved on the limit rod 10, and a cleaning rod 15 fixedly installed at the bottom of the slide block 13. A chute for the cleaning rod 15 to slide is opened inside the cleaning rack 8.

[0036] The air inlet pipe 9 penetrates through the inner wall of the combustion chamber test device body 1 and is fixedly communicated with the cleaning rack 8. The limit rod 10 penetrates through the limit plate 11, and the slide block 13 is in contact with the inner wall of the cleaning rack 8.

[0037] One end of the memory tension spring 14 is fixedly connected to one side of the limit plate 11, and the other end of the memory tension spring 14 is fixedly connected to one side of the slider 13.

[0038] When the combustion stability visualization test device of the afterburner is in use, the inner chamber of the combustion chamber test device body 1 is the combustion chamber. The cleaning rack 8 is divided into an air inlet chamber and a moving chamber by the limit plate 11. The combustion situation in the combustion chamber can be observed through the inner quartz glass 6 and the outer quartz glass 7 on the observation rack 5. First, the fuel and the combustion-supporting agent required for the combustion in the combustion chamber are injected through the fuel conduit 4, and then it can be ignited for the high-pressure combustion test. After burning inside the combustion chamber, it will instantly generate high temperature and high pressure. The high-pressure gas will enter the inside of the air inlet chamber of the cleaning rack 8 through the air inlet pipe 9 and enter the inside of the moving chamber through the air inlet hole 12. The high-pressure gas is initially hot, and the memory tension spring 14 becomes soft after being heated by the high-pressure gas, causing its pulling force to decrease. At the same time, there will be a pressure difference on both sides of the slider 13. Under the action of the pressure difference, the slider 13 will be pushed to move along the slide rail 16 to one side. When the slider 13 moves, the slider 13 will drive the cleaning rod 15 to move synchronously. The cleaning rod 15 closely adheres to the surface of the inner quartz glass 6, so as to achieve the scraping and cleaning effect of the cleaning rod 15 on the dust and impurities on the outer wall of the inner quartz glass 6, thus avoiding the situation that affects visualization, ensuring the stable collection of experimental data and the accuracy of data collection, and improving the overall quality of the test.

[0039] Embodiment 2:

[0040] On the basis of Embodiment 1: The control mechanism includes a plug plate 17 slidably installed inside the cleaning rack 8, a connecting rod 18 fixedly installed at the bottom of the plug plate 17, a control plate 19 fixedly installed at the end of the connecting rod 18 away from the plug plate 17, a control rod 20 fixedly installed on the slider 13, an exhaust groove 21 opened inside the cleaning rack 8, and an exhaust pipe 22 fixedly installed on the observation rack 5.

[0041] The side surface of the plug plate 17 fits with the inner wall of the cleaning rack 8. The control rod 20 penetrates through the limit plate 11, and the end of the control rod 20 away from the slider 13 fits with one side of the plug plate 17.

[0042] When the afterburner combustion stability visualization test device is in use, the fuel and combustion promoter required for combustion in the combustion chamber are injected through the fuel conduit 4, and then it can be ignited for high-pressure combustion tests. After combustion inside the combustion chamber, finally, the slider 13 drives the cleaning rod 15 to move along the direction of the slide rail 16, achieving the effect of scraping and cleaning the dust and impurities on the outer wall of the internal quartz glass 6. At the same time, during the movement of the slider 13, it will contact the fixed plate 24 and drive the fixed plate 24 to move synchronously. The movement of the fixed plate 24 drives the connecting rod 18 to move synchronously, and the movement of the connecting rod 18 drives the blocking plate 17 fixedly connected to it to move synchronously. Until the slider 13 moves to the top, exactly the blocking plate 17 blocks the air inlet hole 12 on the limiting plate 11. At this time, the slider 13 crosses the position of the exhaust groove 21, and at this time, the inside of the moving chamber is communicated with the inside of the observation frame 5. High-pressure air enters the inside of the observation frame 5 and is then discharged through the exhaust pipe 22 on the observation frame 5 until there is no high-pressure gas inside the moving chamber. At this time, the temperature of the moving chamber drops. When the temperature drops, the memory spring 14 hardens and the pulling force increases, pulling the slider 13 and the control rod 20 fixedly installed on it in the opposite direction synchronously. During the movement, the cleaning rod 15 realizes the effect of scraping and cleaning the dust and impurities on the outer wall of the internal quartz glass 6 again. The control rod 20 will pass through the limiting plate 11 and push open the blocking plate 17 until the blocking plate 17 is restored to its initial position. At this time, the intake chamber is communicated with the moving chamber again through the air inlet hole 12, and the inside of the moving chamber and the observation frame 5 are separated again by the slider 13. Repeating this process can achieve automatic back-and-forth scraping and cleaning of the outer wall of the internal quartz glass 6.

[0043] Embodiment 3:

[0044] Based on Embodiment 1 and Embodiment 2: A fixed plate 24 is fixedly connected inside the observation frame 5. One side of the fixed plate 24 is fixedly connected with a first telescopic plate 23, and the movable end of the first telescopic plate 23 is fixedly connected with one side of the slider 13.

[0045] The first telescopic plate 23 is arranged inside the sliding groove. A second telescopic plate 25 is fixedly connected inside the sliding groove, and the movable end of the second telescopic plate 25 is fixedly connected with the side of the slider 13 away from the first telescopic plate 23.

[0046] When the afterburner combustion stability visualization test device is in use, through the cooperation of the cleaning mechanism and the control mechanism, while the cleaning rod 15 scrapes the outer wall of the internal quartz glass 6 back and forth, when the slider 13 drives the cleaning rod 15 to move along the slide rail 16, the second telescopic plate 25 extends and the first telescopic plate 23 contracts. When the slider 13 drives the cleaning rod 15 to move in the reverse direction along the slide rail 16, the second telescopic plate 25 contracts and the first telescopic plate 23 extends. Through the cooperation between the first telescopic plate 23 and the second telescopic plate 25, the chute is always kept in a closed state, preventing the high-pressure air inside the combustion chamber of the combustion chamber test device body 1 from directly entering the inside of the moving chamber, thereby ensuring the normal operation of the cleaning mechanism and the control mechanism.

[0047] Inside the combustion chamber test device body 1, a fuel nozzle 26 is fixedly connected, and the fuel nozzle 26 is arranged below the fuel conduit 4.

[0048] One side of the fuel nozzle 26 is fixedly connected to a flame tube 27, and one side of the flame tube 27 is fixedly connected to a swirler 28.

[0049] When the afterburner combustion stability visualization test device is in use, the fuel nozzle 26 atomizes the liquid fuel into tiny droplets to form a uniform fuel spray. The swirler 28, through blade or orifice design, makes the air generate a rotational flow to form a strong swirling flow field. The rotating airflow of the swirler 28 interacts with the spray of the fuel nozzle 26 to enhance the mixing efficiency of fuel and air. The centrifugal force generated by the swirling flow field throws the large droplets to the periphery to promote secondary breakup and further refine the fuel particles. Through the action of the flame tube 27, it ensures that the flame stably stays near the nozzle; the flow channel design of the flame tube 27 guides the gas flow to avoid flame flicker or extinction caused by turbulent dissipation.

[0050] Working principle: When the afterburner combustion stability visualization test device is in use, first, the fuel and combustion-supporting agent required for combustion in the combustion chamber are injected through the fuel conduit 4. Subsequently, it can be ignited for high-pressure combustion tests. After combustion inside the combustion chamber, it will instantaneously generate high temperature and high pressure. The high-pressure gas will enter the inner part of the air intake chamber in the cleaning rack 8 through the air inlet pipe 9, and enter the inner part of the moving chamber through the air inlet holes 12. The high-pressure gas is initially hot, and the memory spring 14 becomes soft after being heated by the high-pressure gas, causing its pulling force to decrease. At the same time, there will be a pressure difference on both sides of the slider 13. Under the action of the pressure difference, the slider 13 will be pushed to move along the slide rail 16 to one side. When the slider 13 moves, the slider 13 will drive the cleaning rod 15 to move synchronously. The cleaning rod 15 closely adheres to the surface of the inner quartz glass 6, thereby achieving the effect of scraping and cleaning the dust and impurities on the outer wall of the inner quartz glass 6 by the cleaning rod 15. At the same time, during the movement of the slider 13, it will contact the fixed plate 24 and drive the fixed plate 24 to move synchronously. The movement of the fixed plate 24 drives the connecting rod 18 to move synchronously. The movement of the connecting rod 18 drives the blocking plate 17 fixedly connected to it to move synchronously. Until the slider 13 moves to the top, exactly the blocking plate 17 blocks the air inlet holes 12 on the limiting plate 11. At this time, the slider 13 crosses the position of the exhaust groove 21. At this time, the inside of the moving chamber is communicated with the inside of the observation rack 5, and the high-pressure air enters the inside of the observation rack 5 and is then discharged through the exhaust pipe 22 on the observation rack 5 until there is no high-pressure gas inside the moving chamber. At this time, the temperature of the moving chamber drops. When the temperature drops, the memory spring 14 becomes hard and the pulling force becomes larger, pulling the slider 13 and the control rod 20 fixedly installed on it in the opposite direction synchronously. During the movement, the cleaning rod 15 again achieves the effect of scraping and cleaning the dust and impurities on the outer wall of the inner quartz glass 6. The control rod 20 will pass through the limiting plate 11 and push the blocking plate 17 away until the blocking plate 17 is restored to its initial position. At this time, the air intake chamber is communicated with the moving chamber again through the air inlet holes 12, and the moving chamber and the inside of the observation rack 5 are separated again by the slider 13. In this way, it can be reciprocated to automatically scrape and clean the outer wall of the inner quartz glass 6 back and forth. The first telescopic plate 23 extends. Through the cooperation between the first telescopic plate 23 and the second telescopic plate 25, the chute is always kept in a closed state, preventing the high-pressure air inside the combustion chamber of the combustion chamber test device body 1 from directly entering the inside of the moving chamber, thereby ensuring the normal operation of the cleaning mechanism and the control mechanism.

[0051] The above front, back, left, right, up, and down are all based on the Figure 1 in the attached drawings of the specification. Taking the perspective of the observer as the standard, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0052] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the protection scope of the present invention.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A visual test device for combustion stability of afterburner, characterized in that: The combustion chamber test device comprises a combustion chamber test device body (1), a first valve port (2) and a second valve port (3) fixedly mounted on the combustion chamber test device body (1), a fuel pipe (4) fixedly mounted on the combustion chamber test device body (1), an observation frame (5) fixedly mounted on the combustion chamber test device body (1), an inner quartz glass (6) and an outer quartz glass (7) fixedly mounted on the observation frame (5), a cleaning frame (8) fixedly mounted inside the observation frame (5), a cleaning mechanism arranged inside the cleaning frame (8) for wiping the surface of the inner quartz glass (6), and a control mechanism arranged inside the cleaning frame (8) for multiple automatic cleaning; The cleaning mechanism comprises an air intake pipe (9) fixedly mounted on the inner wall of the combustion chamber test device body (1), a limit rod (10) fixedly mounted inside the cleaning frame (8), a limit plate (11) fixedly mounted inside the cleaning frame (8), an air intake hole (12) provided on the limit plate (11), a slide rail (16) fixedly mounted inside the cleaning frame (8), a slider (13) slidably mounted on the slide rail (16), a memory tension spring (14) sleeved on the limit rod (10), and a cleaning rod (15) fixedly mounted on the bottom of the slider (13); a slide groove for the cleaning rod (15) to slide is provided inside the cleaning frame (8).

2. The afterburner combustion stability visualization test device according to claim 1, characterized in that: The air intake pipe (9) passes through the inner wall of the combustion chamber test device body (1) and is fixedly connected to the cleaning frame (8); the limiting rod (10) passes through the limiting plate (11); and the sliding block (13) is in contact with the inner wall of the cleaning frame (8).

3. The afterburner combustion stability visualization test device according to claim 2, characterized in that: One end of the memory tension spring (14) is fixedly connected to one side of the limit plate (11), and the other end of the memory tension spring (14) is fixedly connected to one side of the slider (13).

4. The afterburner combustion stability visualization test device according to claim 1, characterized in that: The control mechanism comprises a blocking plate (17) slidably mounted inside the cleaning frame (8), a connecting rod (18) fixedly mounted at the bottom of the blocking plate (17), a control plate (19) fixedly mounted at one end of the connecting rod (18) away from the blocking plate (17), a control rod (20) fixedly mounted on the slider (13), an exhaust groove (21) provided inside the cleaning frame (8), and an exhaust pipe (22) fixedly mounted on the observation frame (5).

5. The afterburner combustion stability visualization test device according to claim 4, characterized in that: The side surface of the blocking plate (17) is in contact with the inner wall of the cleaning frame (8), the control rod (20) passes through the limiting plate (11), and the end of the control rod (20) away from the slider (13) is in contact with one side of the blocking plate (17).

6. The afterburner combustion stability visualization test device according to claim 1, characterized in that: A fixed plate (24) is fixedly connected inside the observation frame (5), a first telescopic plate (23) is fixedly connected to one side of the fixed plate (24), and a movable end of the first telescopic plate (23) is fixedly connected to one side of the slider (13).

7. The afterburner combustion stability visualization test device according to claim 6, characterized in that: The first telescopic plate (23) is arranged inside the slide groove, and a second telescopic plate (25) is fixedly connected inside the slide groove, and a movable end of the second telescopic plate (25) is fixedly connected to a side of the slider (13) away from the first telescopic plate (23).

8. The afterburner combustion stability visualization test device according to claim 1, characterized in that: A fuel nozzle (26) is fixedly connected to the interior of the combustion chamber test device body (1), and the fuel nozzle (26) is arranged below the fuel conduit (4).

9. The afterburner combustion stability visualization test device according to claim 8, characterized in that: One side of the fuel nozzle (26) is fixedly connected to a flame tube (27), and one side of the flame tube (27) is fixedly connected to a swirler (28).

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