Main combustion chamber and afterburner integrated test platform and method

Abstract

The invention discloses a main combustion chamber and afterburner integrated test platform and method, and belongs to the technical field of aero-engines. The integrated test platform comprises a main combustion chamber test section, a heat exchanger section, a back pressure valve section and an afterburner test section which are connected in sequence; the heat exchanger section comprises a heat exchange flange and a straight and straight mixing section which are coaxially connected; the heat exchange flange is provided with an air inlet pipe, an air collecting ring and a jet hole, external air is introduced into the straight mixing section through the jet hole, and the tail gas of the main combustion chamber and the external air are mixed and cooled and then input into the afterburner test section; the main combustion chamber test section and the afterburner test section are connected with the gas supply system, the oil supply system and the measurement and control system, the heat exchanger section is connected with the gas supply system and the measurement and control system, and the back pressure valve section is connected with the water supply system and used for cooperatively controlling test parameters. Decoupling between working conditions of the main combustion chamber and the afterburner is easier to realize, so that the working condition range of an integrated test of the main combustion chamber and the afterburner is widened.

Description

Technical Field

[0001] The present invention belongs to the technical field of aero-engines, and in particular relates to a main combustion chamber and afterburner combustion chamber integrated test platform and method. Background Art

[0002] The main combustion chamber and afterburner are key components of aircraft engines. Component testing of these components is required during the initial design demonstration phase. Currently, due to different R&D departments, these tests are conducted separately.

[0003] Under design conditions, the exhaust temperature of the main combustion chamber exceeds 1500 degrees Celsius. In single-head tests, the exhaust is directly discharged, and this heat energy is lost. Meanwhile, the intake temperature of the afterburner exceeds 800 degrees Celsius. In single-head tests, electric heating is used to provide intake conditions, resulting in high power consumption and significant voltage loads during each test. For long-duration tests, the testing costs of both the main combustion chamber and the afterburner are very high.

[0004] At present, the integration test of the main combustion chamber and afterburner is carried out on a full-scale real engine. Since the full-scale whole-machine test is already in the engine test stage, it is no longer possible to carry out multiple or long-term tests on only the key components of the combustion chamber.

[0005] In order to focus on the research of the combustion chamber, make full use of the exhaust gas of the main combustion chamber, and save test costs and time, it is urgent to propose a test platform scheme and its control method that integrates the main combustion chamber and afterburner. Summary of the Invention

[0006] Technical issues to be solved: In order to avoid the shortcomings of the prior art, the present invention provides a main combustion chamber and afterburner integrated test platform and method, which uses a direct air intake heat exchanger to connect the main combustion chamber and the afterburner, and the heat exchanger simulates a turbine to cool the exhaust gas of the main combustion chamber, and provides intake conditions for the afterburner after cooling; compared with using a turbine to connect the main combustion chamber and the afterburner in the whole machine test, there is no need to consider the operating condition matching relationship between the real engine core machines, and it is easier to achieve decoupling between the operating conditions of the main combustion chamber and the afterburner, thereby broadening the operating condition range of the main combustion chamber and afterburner integrated test.

[0007] The technical solution of the present invention is: a main combustion chamber and afterburner integrated test platform, comprising a main combustion chamber test section, a heat exchanger section, a back pressure valve section and an afterburner test section connected in sequence; The heat exchanger section includes a coaxially connected heat exchange flange and a flat mixing section; the heat exchange flange is provided with an air inlet pipe in the radial direction and an air collecting ring in the circumferential direction; the air inlet of the air collecting ring is connected to the air inlet pipe, and the air outlet is connected to the jet hole provided on the inner wall of the heat exchange flange, and the external air is introduced into the flat mixing section through the jet hole. The exhaust gas of the main combustion chamber is mixed with the external air and cooled before being input into the afterburner test section; The main combustion chamber test section and the afterburner combustion chamber test section are both connected to the air supply system, the oil supply system, and the measurement and control system. The heat exchanger section is connected to the air supply system and the measurement and control system. The back pressure valve section is connected to the water supply system for coordinated control of test parameters.

[0008] A further technical solution of the present invention is that the air supply system includes a main air supply subsystem, an auxiliary air supply subsystem and a bypass air supply subsystem, each subsystem including a compressor, a heater, a flow valve, a flow meter, a temperature sensor and a pressure sensor connected in sequence; The main air supply subsystem is connected to the main combustion chamber test section, the auxiliary air supply subsystem is connected to the heat exchanger section, and the bypass air supply subsystem is connected to the afterburner test section.

[0009] A further technical solution of the present invention is: the oil supply system includes a main oil supply subsystem and an auxiliary oil supply subsystem, each subsystem includes an oil tank, an oil pump, a flow valve, a flow meter, a temperature sensor, a pressure sensor and a conversion valve connected in sequence; the outlet of the conversion valve is divided into an oil supply pipeline and an oil return pipeline, and a simulated nozzle is provided at the end of the oil return pipeline to maintain flow stability during switching.

[0010] A further technical solution of the present invention is: the measurement and control system includes a control module, a measuring module and a computer, the measuring module is connected to the temperature sensor, the pressure sensor and the flow meter, the control module is connected to the compressor, the oil pump, the valve, the water pump, the igniter and the back pressure valve; the control module and the measuring module are both connected to the computer.

[0011] A further technical solution of the present invention is: the water supply system includes a water tank, a water pump, a flow valve and a flow meter connected once, and its water supply pipe and return pipe are both connected to the back pressure valve. Water flows into the back pressure valve to cool the valve core and then flows back into the water tank to form a closed loop.

[0012] A further technical solution of the present invention is that the main combustion chamber section includes a front measuring section and a test section, wherein the front measuring section includes a pressure sensor, a temperature sensor, a fuel supply quick connector and a fuel supply pipe; and the test section includes a combustion chamber head injection unit, an igniter, a casing and a flame tube; The afterburner section consists of a front measuring section and a test section. The front measuring section includes a temperature sensor, a fuel supply quick-connect connector and a fuel supply pipe; the test section includes an integrated combustion chamber head structure, a casing and a heat shield. The integrated head structure includes an oil collecting ring, a fuel injection hole and a stabilizer. The casing is connected to the air intake pipe and there is an annular cavity between it and the heat shield.

[0013] A test method for a main combustion chamber and afterburner integrated test platform, the specific steps are as follows: Working condition formulation: Generate an integrated verification working condition table by matching the main combustion chamber outlet temperature with the afterburner inlet temperature; Ignition and start-up: sequentially adjust the air supply system, oil supply system, and water supply system to the ignition conditions to complete the ignition of the main combustion chamber and afterburner; Steady-state control: Based on the oil-gas ratio and gradient limit rules, gradually adjust the parameters to the target operating conditions; Flame-out and shutdown: Cut off the fuel supply in sequence, lower the temperature and then shut down the system; Reignition: The main combustion chamber or afterburner is shut down separately and the reignition process is performed.

[0014] A further technical solution of the present invention is: In the working condition formulation method, the inlet flow rate of the heat exchanger is determined by the following equations: and temperature :

[0015]

[0016] in, is the main combustion chamber inlet flow, is the theoretical temperature at the main combustion chamber outlet, is the afterburner inlet temperature, is the afterburner inlet flow rate.

[0017] A further technical solution of the present invention is: the specific operation process of the test method is as follows: Working condition formulation method: 1.1 Sort the main combustion chamber operating parameters by outlet theoretical temperature in ascending order to generate List B, and sort the afterburner operating parameters by inlet temperature in ascending order to generate List A; 1.2 Traverse list A. For each afterburner operating condition Ai, find the main combustor operating condition Bi from list B with the smallest difference between the outlet temperature and the inlet temperature of Ai. Combine the operating condition Bi and the operating condition Ai and write them into a new table C. Delete the operating condition Bi from list B. 1.3 Traverse the remaining operating conditions in List B. For each main combustion chamber operating condition Bj, find the afterburner operating condition Aj from List A that has the smallest difference between the inlet temperature and the outlet temperature of Bj. Write the combination of operating conditions Bj and Aj into Table C. 1.4 Rearrange the combinations in Table C from smallest to largest according to afterburner inlet temperature; 1.5 Determine the heat exchanger parameters based on the heat balance equation and solve the heat exchanger inlet flow and temperature , generate an integrated verification condition table; Ignition starting method: 2.1 Adjust the flow valve, main heater and back pressure valve of the main air supply subsystem to ensure that the inlet flow, temperature and pressure of the main combustion chamber reach the ignition condition; 2.2 Adjust the flow valves of the auxiliary air supply subsystem, the bypass air supply subsystem, and the water system so that the heat exchanger inlet air flow, back pressure valve water flow, and afterburner heat shield cooling air flow meet ignition conditions; 2.3 Start the main fuel pump, adjust the flow valve of the main fuel supply subsystem to the ignition fuel flow, switch the switching valve to the fuel supply pipeline, and start the main combustion chamber igniter to complete ignition; 2.4 After the flame in the main combustion chamber stabilizes, start the auxiliary fuel pump, adjust the flow valve of the auxiliary fuel supply subsystem to the target fuel flow, switch the auxiliary fuel supply switching valve to the fuel supply pipeline, and complete the ignition of the afterburner; Steady-state control method: 3.1 Extract the target operating condition Hii from the integrated verification operating condition table and adjust the current operating condition Hi starting from the current operating condition. If the afterburner fuel-air ratio of Hi is higher than Hii, the auxiliary air supply subsystem flow valve, the auxiliary fuel supply subsystem flow valve, and the bypass air supply subsystem flow valve are adjusted first to make the afterburner operating condition approach Hii. Otherwise, the main combustion chamber operating condition is adjusted first: 3.11 If the fuel-air ratio of the main combustion chamber of Hi is higher than Hii, first adjust the water system flow valve to the target water flow, and then adjust the opening of the main air supply flow valve, main oil supply flow valve and back pressure valve; 3.12 If the fuel-air ratio of the main combustion chamber of Hi is lower than Hii, first adjust the opening of the main air supply flow valve, main oil supply flow valve and back pressure valve, and then adjust the water supply system flow valve; 3.2 Follow the gradient limit during the adjustment process; 3.3 Repeat the adjustment until the current working condition reaches the target working condition, and then switch to the next target working condition; How to shut down the engine: 4.1 Cut off the auxiliary fuel supply subsystem switching valve, close the auxiliary fuel pump and flow valve, increase the auxiliary air supply and bypass air supply flow to the maximum, and shut down the afterburner; 4.2 Cut off the main fuel supply subsystem switching valve, close the main fuel pump and flow valve, set the back pressure valve opening to 100%, increase the main air supply flow to the maximum, and extinguish the main combustion chamber; 4.3 When the temperature of the heat exchanger section drops to the safety threshold of the pipeline material, shut down the auxiliary compressor and the bypass compressor; 4.4 When the temperature of the heat exchanger section further drops to the safety threshold where the back pressure valve cannot cool down, shut down the main compressor, water pump, and measurement and control system, and cut off the platform power supply; Re-ignition method: 5.1 Main combustion chamber flameout treatment: 5.11 Cut off the main fuel supply switching valve to stop the fuel supply to the main combustion chamber; 5.12 Adjust the auxiliary air supply, bypass air supply and water system to ignition conditions according to step 2.2; 5.13 Adjust the main gas supply and back pressure valve to ignition conditions according to step 2.1; 5.14 Re-ignite the main combustion chamber and restore steady-state control; 5.2 Afterburner flameout treatment: 5.21 Cut off the auxiliary fuel supply switching valve to stop the fuel supply to the afterburner; 5.22 Adjust the auxiliary air supply, bypass air supply and water system to ignition conditions according to step 2.2; 5.23 Adjust the main combustion chamber operating conditions to ignition conditions according to step 2.1; 5.24 Re-ignite the afterburner and restore steady-state control.

[0018] A further technical solution of the present invention is: in the steady-state control method, each adjustment amount of the air flow and fuel flow does not exceed 10% of the current value, the air temperature adjustment amount does not exceed 50°C, the back pressure valve opening adjustment amount does not exceed 5%, and the water flow adjustment amount does not exceed 20%.

[0019] Beneficial effects The beneficial effects of the present invention are as follows: the present invention integrates the main combustion chamber and the afterburner on a single platform, and uses a heat exchanger to simulate the temperature drop caused by turbine expansion work, which helps to fully utilize the thermal energy of the exhaust gas emitted by the main combustion chamber and effectively reduces the testing cost of the afterburner. By integrating the main combustion chamber and the afterburner on a single platform, combustion tests of the main combustion chamber and the afterburner can be conducted simultaneously. Components with similar thermal protection technologies for the main combustion chamber flame tube and the afterburner heat shield can be tested simultaneously, thereby shortening the development cycle. The specific advantages are analyzed as follows: 1. This invention uses a heat exchanger to recover heat energy from the main combustion chamber exhaust (above 1500°C), cooling it to the required intake temperature of the afterburner (800-1250°C). This saves over 53.2% of the afterburner's electrical heating power (e.g., 528.145 kW in the example), significantly reducing power consumption. The integrated platform eliminates the need for redundant equipment such as compressors and heaters required in traditional separate platform testing, significantly lowering the cost of a single test.

[0020] 2. This invention supports simultaneous thermal protection testing of both the main combustion chamber flame liner and the afterburner heat shield, shortening the development cycle for similar components. Steady-state control methods (such as gradient limiting) and reignition logic based on the measurement and control system enable rapid switching between multiple operating conditions, improving testing efficiency.

[0021] 3. This invention utilizes steady-state control rules (such as dynamic oil-gas ratio balancing and control gradient limiting) and a re-ignition process to avoid flameout risks during testing and shorten recovery time after flameout. The flameout shutdown method also includes established safety thresholds for pipeline materials and a no-cooling threshold for the backpressure valve, ensuring equipment durability under extreme operating conditions.

[0022] 4. This invention utilizes a modular design for the air supply, fuel supply, and measurement and control subsystems, enabling rapid adaptation to different combustion chamber types (e.g., single-tube, sector-shaped, and annular structures), resulting in strong scalability. The heat balance equations incorporated into the operating condition formulation method enable precise decoupling of the flow and temperature between the main and afterburner chambers, expanding the range of test conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The overall design diagram of an embodiment of the integrated test platform provided by the present invention; Figure 2 A schematic diagram of the gas supply system of an embodiment of the integrated test platform provided by the present invention; Figure 3 A schematic diagram of a fuel system of an embodiment of the integrated test platform provided by the present invention; Figure 4 A schematic diagram of a measurement and control system of an embodiment of the integrated test platform provided by the present invention; Figure 5 A schematic diagram of a water system of an embodiment of the integrated test platform provided by the present invention; Figure 6 A schematic diagram of a main combustion chamber section of an embodiment of the integrated test platform provided by the present invention; Figure 7 A schematic diagram of a heat exchanger section of an embodiment of the integrated test platform provided by the present invention; Figure 8 A schematic diagram of the afterburner section of an embodiment of the integrated test platform provided by the present invention; Figure 9A test flow chart of an embodiment of the integrated test platform provided by the present invention; Figure 10 Formulate a flow chart for the operating conditions of an embodiment of the integrated test platform provided by the present invention; Figure 11 An ignition startup flow chart of an embodiment of the integrated test platform provided by the present invention; Figure 12 A steady-state control flow chart of an embodiment of the integrated test platform provided by the present invention; Figure 13 A flameout and shutdown flow chart of an embodiment of the integrated test platform provided by the present invention; Figure 14 A re-ignition flow chart of an embodiment of the integrated test platform provided by the present invention; Explanation of reference numerals: 1. air supply system; 11. main air supply subsystem; 111. main compressor; 112. main heater; 113. main air supply pipe accessories; 12. auxiliary air supply subsystem; 121. auxiliary compressor; 122. auxiliary heater; 123. auxiliary air supply pipe accessories; 13. bypass air supply subsystem; 131. bypass compressor; 132. bypass heater; 133. bypass air supply pipe accessories; 2. oil supply system; 21. main oil supply subsystem System; 211, main fuel tank; 212, main fuel pump; 213, main fuel supply pipe accessories; 22, auxiliary fuel supply subsystem; 221, auxiliary fuel tank; 222, auxiliary fuel pump; 223, auxiliary fuel supply pipe accessories; 3, measurement and control system; 31, measurement module; 32, control module; 33, computer; 4, water system; 41, water tank; 42, water pump; 43, water supply pipe accessories; 5, main combustion chamber test section; 51, front measurement section; 511, pressure sensor sensor; 512, temperature sensor; 513, fuel supply quick connector; 514, fuel supply pipe; 52, first test section; 521, head injection unit; 522, igniter; 523, casing; 524, flame tube; 6, heat exchanger section; 61, heat exchange flange; 611, intake pipe; 612, gas collecting ring; 613, jet hole; 62, stabilization section; 621, stabilization long tube; 622, temperature sensor; 7, back pressure valve section; 8, Afterburner test section; 81. Front measuring section; 82. Second test section; 811. Temperature sensor; 812. Fuel supply quick connector; 813. Fuel supply pipe; 82. Test section; 821. Oil collecting ring; 822. Fuel injection hole; 823. Intake pipe; 824. Casing; 825. Stabilizer; 826. Heat shield; a. Flow valve; b. Flow meter; c. Temperature sensor; d. Pressure sensor; e. Conversion valve; f. Simulated nozzle. DETAILED DESCRIPTION The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0024] Conventional testing of the main combustion chamber and afterburner is typically conducted independently. High-temperature exhaust gases (>1500°C) from the main combustion chamber are directly discharged, wasting heat energy. The afterburner requires additional electrical heating to simulate high-temperature intake air (>800°C), resulting in extremely high energy consumption (>500kW per cycle). Traditional integrated testing relies on full-scale engine runs, which prevents flexible adjustment of operating conditions or repeated testing of key components (such as the flame tube and heat shield). This results in long development cycles and high costs. Existing simulation systems only support single temperature control and are unable to dynamically match the fuel-gas ratio and flow rate coupling relationship under real-world operating conditions. This results in test data that deviates from reality and hinders optimization of combustion chamber performance. Therefore, the present invention provides an integrated test platform for a main combustion chamber and an afterburner, comprising a main combustion chamber test section, a heat exchanger section, a back pressure valve section and an afterburner test section connected in sequence; the heat exchanger section comprises a coaxially connected heat exchange flange and a straight mixing section; the heat exchange flange is provided with an air intake pipe radially and an air collecting ring circumferentially; the air inlet of the air collecting ring is connected with the air intake pipe, and the air outlet is connected with the jet hole provided on the inner wall of the heat exchange flange, and the external air is introduced into the straight mixing section through the jet hole, and the exhaust gas of the main combustion chamber is mixed with the external air and cooled before being input into the afterburner test section; the main combustion chamber test section and the afterburner test section are both connected to the air supply system, the oil supply system and the measurement and control system, the heat exchanger section is connected to the air supply system and the measurement and control system, and the back pressure valve section is connected to the water supply system for collaborative control of test parameters.

[0025] The technical solution of the present invention uses a direct-intake heat exchanger to connect the main combustion chamber and afterburner. Compared to the use of a turbine to connect the main combustion chamber and afterburner in whole-machine testing, this eliminates the need to consider the operating condition matching relationship between the actual engine core. This makes it easier to achieve decoupling between the main combustion chamber and afterburner operating conditions, thereby broadening the operating condition range of the main combustion chamber and afterburner integrated testing. The heat exchanger adopts a heat exchange flange form, which can easily connect to a variety of different combustion chamber structures such as single-tube, fan-shaped, and annular. In addition, the present invention provides a comprehensive integrated testing method, including operating condition setting, ignition startup, steady-state control, flameout shutdown, and re-ignition methods, thereby improving the practicality of the integrated testing platform.

[0026] The above technical solution is further described below with reference to the accompanying drawings: In one embodiment, referring to Figure 1 As shown, the main combustion chamber and afterburner integrated test platform of this embodiment includes an air supply system 1, an oil supply system 2, a measurement and control system 3, a water supply system 4, a main combustion chamber test section 5, a heat exchanger section 6, a back pressure valve section 7 and an afterburner test section 8.

[0027] Figure 1The connection mode of the pipelines in the integrated test platform of the main combustion chamber and afterburner is marked: the main air supply system 11 is connected to the front measuring section 51 of the main combustion chamber test section 5, the auxiliary air supply system 12 is connected to the heat exchange flange air inlet pipe 611 of the heat exchanger test section 6, the bypass air supply system 13 is connected to the test section air inlet pipe 823 of the afterburner test section 8, the main oil supply system 21 is connected to the front measuring section oil supply quick connector 513 of the main combustion chamber test section 5, and the auxiliary oil supply system 22 is connected to the front measuring section oil supply quick connector 812 of the afterburner test section 8. The water supply pipe and return pipe of the water supply system 4 are both connected to the back pressure valve 7. Water flows into the back pressure valve 7 to cool the valve core and then returns to the water tank 41. Figure 1 The connection method of the measurement and control wires in the integrated test platform of the main combustion chamber and afterburner is marked: the compressor, oil pump, valve, water pump, igniter and back pressure valve are connected to the control module 31 in the measurement and control system, the temperature sensor, pressure sensor and flow meter are connected to the measurement module 32 in the measurement and control system, and the control module 31 and the measurement module 32 are both connected to the computer through control wires.

[0028] In one embodiment, referring to Figure 2 As shown, the air supply system 1 consists of a main air supply subsystem 11, a secondary air supply subsystem 12, and a bypass air supply subsystem 13. The main air supply subsystem 11 comprises a main compressor 111, a main heater 112, and a main air supply pipe accessory 113. The secondary air supply subsystem 12 comprises a secondary compressor 121, a secondary heater 122, and a secondary air supply pipe accessory 123. The bypass air supply subsystem 13 comprises a bypass compressor 131, a bypass heater 132, and a bypass air supply pipe accessory 133. The pipe accessories include a flow valve a, a flow meter b, a temperature sensor c, and a pressure sensor d. In each subsystem, the compressor, heater, flow valve, flow meter, temperature sensor, and pressure sensor are connected in sequence. In one embodiment, referring to Figure 3 As shown, the fuel supply system 2 consists of a main fuel supply subsystem 21 and an auxiliary fuel supply subsystem 22. The main fuel supply subsystem 21 consists of a main fuel tank 211, a main fuel pump 212 and a main fuel supply pipe accessory 213. The auxiliary fuel supply subsystem consists of an auxiliary fuel tank 221, an auxiliary fuel pump 222 and an auxiliary fuel supply pipe accessory 223. The pipe accessories include a flow valve a, a flow meter b, a temperature sensor c, a pressure sensor d and a conversion valve e. In each subsystem, the fuel tank, the fuel pump, the flow valve, the flow meter, the temperature sensor, the pressure sensor and the conversion valve are connected in sequence. The outlet of the conversion valve is divided into two pipelines, one is the return oil pipeline and the other is the supply oil pipeline. The conversion valve is used to switch the direction of fuel flow. The end of the return oil pipeline is in the fuel tank and is connected to a simulated nozzle f, which is the same as the nozzle in the actual combustion chamber, to ensure that the flow remains basically unchanged after the conversion valve is switched. In one embodiment, referring to Figure 4As shown, the measurement and control system 3 is composed of a control module 31, a measurement module 32 and a computer 33; In one embodiment, referring to Figure 5 As shown, the water supply system 4 consists of a water tank 41, a water pump 42 and a water supply pipe accessory 43. The water supply pipe accessory includes a flow valve and a flow meter. The water tank, water pump, flow valve and flow meter are connected in sequence. In addition to supplying water to the outside, there is also a return pipe connected to the water tank to form a closed loop. In one embodiment, referring to Figure 6 As shown, the main combustion chamber test section 5 consists of a front measuring section 51 and a test section 52. The front measuring section 51 includes a pressure sensor 511, a temperature sensor 512, a fuel supply quick connector 513, and a fuel supply pipe 514. The test section includes a combustion chamber head injection unit 521, an igniter 522, a casing 523, and a flame tube 524. In one embodiment, referring to Figure 7 As shown, the heat exchanger section 6 is composed of a heat exchange flange 61 and a stabilizing section 62. The heat exchange flange 61 includes an air inlet pipe 611, an air collecting ring 612 and a jet hole 613. The stabilizing section 62 includes a straight pipe 621 on which a temperature sensor 622 is installed. In one embodiment, referring to Figure 8 As shown, the afterburner test section 8 consists of a front measuring section 81 and a test section 82. The front measuring section 81 includes a temperature sensor 811, a fuel supply quick connector 812 and a fuel supply pipe 813. The test section 82 includes an integrated combustion chamber head structure, a casing 824 and a heat shield 826. The integrated head structure includes an oil collecting ring 821, a fuel injection hole 822 and a stabilizer 825. The casing 824 is connected to the air intake pipe 823, and there is an annular cavity between it and the heat shield 826.

[0029] Based on the aforementioned components and connections, an integrated test platform was constructed for simultaneous testing of the main combustion chamber and afterburner. To further illustrate the integrated test method, the test flow and steps are described using the main combustion chamber flame liner and afterburner heat shield wall temperature measurement test as an example.

[0030] The overall test steps are as follows Figure 9 As shown, after the test starts, we must first formulate a test condition table for integrated verification based on the main combustion chamber and afterburner test conditions given by the general department and the condition formulation method; then, we must complete the ignition and start-up of the main combustion chamber and afterburner according to the ignition and start-up method; then, based on the steady-state control method and referring to the test condition table for integrated verification, we will conduct tests one by one, and finally complete the test work of all conditions; if the main combustion chamber or afterburner is flameout during the steady-state control process, it is necessary to re-ignite it according to the re-ignition method; finally, we will extinguish the flameout and shut down according to the flameout shutdown method to complete the entire integrated verification test.

[0031] The process of setting working conditions is as follows Figure 10 As shown, the method is formulated according to the working conditions, which is generally divided into 5 steps: 1. Sort the afterburner operating parameters in ascending order of inlet temperature into List A. Sort the main combustion chamber operating parameters in ascending order of theoretical combustion chamber outlet temperature into List B. Then, select the first operating condition A1 from List A as the current operating condition Ai. 2. Starting from the first operating condition A1 in the afterburner operating condition list, find the main combustor operating condition Bi whose outlet theoretical temperature is closest to the inlet temperature of this operating condition. Combine operating condition Bi with operating condition Ai and write them into a new table C. Then jump to the next operating condition in operating condition list A and use this operating condition as the current operating condition Ai. Delete operating condition Bi from operating condition table B. Repeat the above steps until all operating conditions in operating condition list A have been processed. 3. Take the first operating condition B1 from list B as the current operating condition Bi. Find the afterburner operating condition Ai whose inlet temperature is closest to the theoretical combustion chamber outlet temperature of operating condition Bi. Combine operating conditions Bi and Ai and write them into table C. Then jump to the next operating condition in the main combustion chamber operating condition list and use that operating condition as the current operating condition Bi. Repeat the above steps until all operating conditions in operating condition list B have been processed. 4. Rearrange the operating conditions in Table C from smallest to largest according to the afterburner inlet temperature; 5. Starting from the first working condition in Table C, according to the following equation:

[0032]

[0033] in, is the main combustion chamber inlet flow, is the theoretical temperature at the main combustion chamber outlet, is the afterburner inlet temperature, is the afterburner inlet flow rate. The above variables are all known quantities. By solving the equations, the heat exchanger inlet flow rate can be determined. and temperature , thus achieving decoupling and matching between the main combustion chamber and afterburner operating conditions through the introduction of the heat exchanger, and ultimately forming an integrated verification operating condition table.

[0034] The ignition start process is as follows Figure 11 As shown, according to the ignition start method, it is generally divided into 3 steps: 1. Turn on the main switch, start the main compressor 111, turn on the main heater 112, and adjust the main air supply subsystem flow valve 11a, the main heater 112, and the back pressure valve 7 so that the main combustion chamber inlet flow, temperature, and pressure reach the ignition condition; 2. Turn on auxiliary compressor 121, bypass compressor 131, auxiliary heater 122, bypass heater 132, and water pump 42. Adjust auxiliary air supply subsystem flow valve 12a, auxiliary heater 122, bypass air supply subsystem flow valve 13a, and water system flow valve 4a to ensure that the inlet air flow and temperature of the heat exchanger, and the cooling air and water flow of the afterburner heat shield meet ignition conditions. 3. Turn on the main oil pump 212 and the auxiliary oil pump 222, first place the conversion valve e of the main oil supply subsystem 21 and the auxiliary oil supply subsystem 22 in the return oil gear, adjust the main oil supply subsystem flow valve 21a so that the fuel flow in the main combustion chamber meets the ignition conditions, adjust the auxiliary oil supply subsystem flow valve 22a so that the fuel flow in the afterburner also meets the ignition conditions, place the conversion valve 21e of the main oil supply subsystem in the oil supply gear to supply oil to the main combustion chamber test section, turn on the main combustion chamber igniter, and after the flame in the main combustion chamber stabilizes, place the conversion valve 22e of the auxiliary oil supply subsystem in the oil supply gear to supply oil to the afterburner test section, and finally complete the ignition start.

[0035] The process of homeostatic regulation is as follows Figure 12 As shown in the figure, according to the steady-state control method, the control objects are the main combustion chamber, afterburner and water system respectively, and the order of object control is determined in accordance with the following two principles: 1. If the afterburner fuel-air ratio of the current operating condition Hi is higher than that of the target operating condition Hii, the afterburner operating condition is adjusted first; otherwise, the main combustion chamber operating condition is adjusted first.

[0036] 2. If the oil-gas ratio of the main combustion chamber under the current operating condition Hi is higher than the target operating condition Hii, the main combustion chamber operating condition is adjusted first, and then the water system is adjusted; otherwise, the water system is adjusted first, and then the main combustion chamber operating condition is adjusted.

[0037] The control process of the main combustion chamber working condition is as follows: the control objects are the main fuel supply subsystem 21, the main air supply subsystem 11, the main heater 112 and the back pressure valve 7, and the order of object control is determined in accordance with the following four principles: 1. If the fuel flow rate of the main combustion chamber under the current operating condition Hi is lower than the target operating condition Hii, the main fuel supply subsystem flow valve 21a is adjusted first to increase the fuel flow rate. Otherwise, the main combustion chamber air flow rate is adjusted first.

[0038] 2. If the main combustion chamber air flow rate of the current working condition Hi is higher than the target working condition Hii, the main air supply subsystem flow valve 11a is adjusted first to reduce the air flow rate. Otherwise, the main combustion chamber inlet temperature is adjusted first.

[0039] 3. If the main combustion chamber inlet temperature of the current operating condition Hi is lower than the target operating condition Hii, the main heater 112 is adjusted first to increase the air temperature; otherwise, the main combustion chamber air pressure is adjusted first.

[0040] 4. If the main combustion chamber inlet pressure of the current working condition Hi is lower than the target working condition Hii, first adjust the back pressure valve 7 to increase the air pressure; otherwise, adjust the back pressure valve 7 to reduce the intake pressure.

[0041] The control process for the afterburner operating conditions is as follows: the control objects are the auxiliary fuel supply subsystem 22, the auxiliary air supply subsystem 12, the auxiliary heater 122, and the bypass air supply subsystem 13. The order of control of the objects is determined in accordance with the following four principles: 1. If the afterburner fuel-air ratio in the current operating condition Hi is lower than the target operating condition Hii, first adjust the bypass air supply subsystem flow valve 13a and bypass heater 132 to adjust the current heat shield cooling air flow toward the target value. Otherwise, first adjust the afterburner fuel flow.

[0042] 2. If the afterburner fuel flow rate of the current operating condition Hi is lower than the target operating condition Hii, the auxiliary fuel supply subsystem flow valve 22a is adjusted first to increase the fuel flow rate. Otherwise, the afterburner air flow rate is adjusted first.

[0043] 3. If the afterburner air flow rate of the current operating condition Hi is higher than the target operating condition Hii, the auxiliary air supply subsystem flow valve 12a is adjusted to reduce the air flow rate. Otherwise, the afterburner inlet temperature is adjusted first.

[0044] 4. If the afterburner inlet temperature of the current operating condition Hi is lower than the target operating condition Hii, the auxiliary heater 122 is adjusted to increase the intake air temperature; otherwise, the intake air temperature is reduced.

[0045] like Figure 12 As shown in FIG, in the process of adjusting the current working condition Hi to the target working condition Hii, according to the steady-state control method, the adjustment of various parameters should follow the following principles: During the adjustment process, the air flow and fuel flow shall be adjusted by no more than 10% of the current value each time; the air temperature shall be adjusted by no more than 50 degrees Celsius each time; the air pressure shall be adjusted by no more than 5% of the current value each time; and the water flow shall be adjusted by no more than 20% of the current value each time. According to the above principles, if one adjustment fails to adjust the current operating condition Hi to the target operating condition Hii, the control process is repeated until the operating condition Hii is adjusted. Thereafter, the operating condition Hii is used as the current operating condition Hi. Under the current operating condition Hi, the collected values ​​of the temperature measurement points on the flame tube of the main combustion chamber and the heat shield of the afterburner are recorded. After the collection is completed, the next operating condition in the integrated verification operating condition table is used as the target operating condition Hii. The above test process is repeated until the test measurement of all operating conditions is completed and the steady-state control process is completed.

[0046] The shutdown process is as follows Figure 13 As shown, according to the flameout shutdown method, it is generally divided into 4 steps: 1. Switch the switching valve 22e of the auxiliary fuel supply subsystem to cut off the fuel supply to the afterburner, close the auxiliary fuel pump 222 and the flow valve 22a, close the auxiliary heater 122 and the bypass heater 132, and increase the flow valve a of the auxiliary air supply subsystem 12 and the bypass air supply subsystem 13.

[0047] 2. Switch the main fuel supply subsystem switching valve 21e to cut off the fuel supply to the main combustion chamber, turn off the main oil pump 212 and flow valve 21a, turn off the main heater 112, set the back pressure valve 7 position to 100%, and increase the main air supply subsystem flow valve 11a.

[0048] 3. Maintain the flow rate of each air supply subsystem unchanged and purge for a period of time. When the feedback temperature of the temperature sensor 622 of the heat exchanger section 6 drops to the safety threshold of the pipeline material, turn off the auxiliary compressor 121 and the bypass compressor 131.

[0049] 4. Maintain the flow rate of the main air supply subsystem unchanged and purge for a period of time. When the feedback temperature of the temperature sensor 622 of the heat exchanger section 6 further drops to the safety threshold of the back pressure valve without cooling, turn off the main compressor 111, turn off the water pump 42 and valve 4a in the water system, turn off the computer 33 of the measurement and control system, cut off the power supply of the entire integrated verification platform, and finally shut down.

[0050] If either the main combustion chamber or afterburner flameout occurs during the test, the integrated verification platform needs to be reignited. Depending on the reignition method, two situations are handled: main combustion chamber alone flameout and afterburner alone flameout.

[0051] If the main combustion chamber is extinguished alone, the re-ignition method is generally divided into 4 steps: 1. Switch the main fuel supply subsystem switching valve 21e to cut off the fuel supply to the main combustion chamber.

[0052] 2. Adjust the auxiliary air supply subsystem flow valve 12a and auxiliary heater 122 so that the air flow and temperature at the heat exchanger inlet are in ignition conditions. Adjust the bypass air supply subsystem flow valve 13a so that the cooling air flow of the afterburner heat shield meets the ignition conditions. Adjust the water valve 4a so that the water inlet flow of the back pressure valve 7 meets the ignition conditions. Adjust the auxiliary fuel supply subsystem flow valve 22a so that the fuel flow meets the afterburner ignition conditions.

[0053] 3. Adjust the main air supply subsystem flow valve 11a and the main heater 112, and adjust the back pressure valve 7 so that the main combustion chamber inlet air flow, temperature and pressure meet the ignition conditions.

[0054] 4. Adjust the main fuel supply subsystem flow valve 21a so that the fuel flow meets the ignition condition of the main combustion chamber, switch the main fuel supply subsystem conversion valve 21e to supply fuel to the main combustion chamber, and turn on the igniter 522 at the same time. The main combustion chamber is successfully ignited again.

[0055] If the afterburner flames out alone, the re-ignition method is generally divided into 4 steps: 1. Switch the auxiliary fuel supply subsystem switching valve 22e to cut off the fuel supply to the afterburner.

[0056] 2. Adjust the auxiliary air supply subsystem flow valve 22a and the auxiliary heater 122 so that the air flow and temperature at the heat exchanger inlet are at the ignition condition. Adjust the bypass air supply subsystem flow valve 13a so that the cooling air flow of the afterburner heat shield meets the ignition condition. Adjust the water valve 4a so that the water flow at the back pressure valve meets the ignition condition.

[0057] 3. Adjust the main air supply subsystem flow valve 11a and the main heater 112, and adjust the back pressure valve 7 so that the air flow, temperature and pressure at the main combustion chamber inlet meet the ignition conditions, and adjust the main fuel supply subsystem flow valve 21a so that the fuel flow meets the ignition conditions of the main combustion chamber.

[0058] 4. Adjust the auxiliary fuel supply subsystem flow valve 22a so that the fuel flow meets the afterburner ignition condition, switch the auxiliary fuel supply subsystem conversion valve 22e, supply fuel to the afterburner, and the afterburner is successfully ignited again.

[0059] If the main combustion chamber and afterburner burn out at the same time, re-ignite according to the ignition starting method.

[0060] Since the high-temperature airflow at the outlet of the main combustion chamber is utilized, the afterburner does not need to consume additional heating power to maintain its intake air temperature, thus saving energy. Note that this part of the energy saved is actually used for experimental research in the main combustion chamber. The following table is used as an example to illustrate:

[0061] As shown in the table above, the integrated test solution reduced compressor power by approximately 53.2% and heater power by 528.145 kW compared to the afterburner-only test solution. The longer the test, the greater the energy savings. Furthermore, integrating the main combustor and afterburner on a single platform allowed for simultaneous measurement of the main and afterburner liner and heat shield temperatures, rather than testing each component separately. This helped shorten the development cycle for both components.

[0062] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A main combustion chamber and afterburner integrated test platform, characterized by: It includes the main combustion chamber test section, heat exchanger section, back pressure valve section and afterburner test section connected in sequence; The heat exchanger section includes a coaxially connected heat exchange flange and a flat mixing section; the heat exchange flange is provided with an air inlet pipe in the radial direction and an air collecting ring in the circumferential direction; the air inlet of the air collecting ring is connected to the air inlet pipe, and the air outlet is connected to the jet hole provided on the inner wall of the heat exchange flange, and the external air is introduced into the flat mixing section through the jet hole. The exhaust gas of the main combustion chamber is mixed with the external air and cooled before being input into the afterburner test section; The main combustion chamber test section and the afterburner combustion chamber test section are both connected to the air supply system, the oil supply system, and the measurement and control system. The heat exchanger section is connected to the air supply system and the measurement and control system. The back pressure valve section is connected to the water supply system for coordinated control of test parameters.

2. The main combustion chamber and afterburner integrated test platform according to claim 1, characterized in that: The air supply system includes a main air supply subsystem, an auxiliary air supply subsystem and a bypass air supply subsystem, each subsystem including a compressor, a heater, a flow valve, a flow meter, a temperature sensor and a pressure sensor connected in sequence; The main air supply subsystem is connected to the main combustion chamber test section, the auxiliary air supply subsystem is connected to the heat exchanger section, and the bypass air supply subsystem is connected to the afterburner test section.

3. The main combustion chamber and afterburner integrated test platform according to claim 1, characterized in that: The oil supply system includes a main oil supply subsystem and an auxiliary oil supply subsystem. Each subsystem includes an oil tank, an oil pump, a flow valve, a flow meter, a temperature sensor, a pressure sensor and a conversion valve connected in sequence; the outlet of the conversion valve is divided into an oil supply pipeline and an oil return pipeline. A simulated nozzle is provided at the end of the oil return pipeline to maintain flow stability during switching.

4. The main combustion chamber and afterburner integrated test platform according to claim 1, characterized in that: The measurement and control system includes a control module, a measuring module and a computer. The measuring module is connected to a temperature sensor, a pressure sensor and a flow meter. The control module is connected to a compressor, an oil pump, a valve, a water pump, an igniter and a back pressure valve. Both the control module and the measuring module are connected to the computer.

5. The main combustion chamber and afterburner integrated test platform according to claim 1, characterized in that: The water supply system includes a water tank, a water pump, a flow valve and a flow meter that are connected once. The water supply pipe and the return pipe are both connected to the back pressure valve. Water flows into the back pressure valve to cool the valve core and then flows back into the water tank to form a closed loop.

6. The main combustion chamber and afterburner integrated test platform according to claim 1, characterized in that: The main combustion chamber section includes a front measurement section and a test section. The front measurement section includes a pressure sensor, a temperature sensor, a fuel supply quick connector and a fuel supply pipe; the test section includes a combustion chamber head injection unit, an igniter, a casing and a flame tube; The afterburner section includes a front measuring section and a test section. The front measuring section includes a temperature sensor, a fuel supply quick-connect connector and a fuel supply pipe; the test section includes an integrated combustion chamber head structure, a casing and a heat shield. The integrated head structure includes an oil collecting ring, a fuel injection hole and a stabilizer. The casing is connected to the air intake pipe and there is an annular cavity between it and the heat shield.

7. A test method for the main combustion chamber and afterburner integrated test platform according to any one of claims 1 to 6, characterized in that The specific steps are as follows: Working condition formulation: Generate an integrated verification working condition table by matching the main combustion chamber outlet temperature with the afterburner inlet temperature; Ignition and start-up: sequentially adjust the air supply system, oil supply system, and water supply system to the ignition conditions to complete the ignition of the main combustion chamber and afterburner; Steady-state control: Based on the oil-gas ratio and gradient limit rules, gradually adjust the parameters to the target operating conditions; Flame-out and shutdown: Cut off the fuel supply in sequence, lower the temperature and shut down the system; Reignition: Execute the reignition process for the main combustion chamber or afterburner combustion chamber.

8. The test method of the main combustion chamber and afterburner integrated test platform according to claim 7, characterized in that: In the working condition formulation, the heat exchanger inlet flow m is determined by the following equations: 换热器 and temperature T 换热器 : m 主燃 ×(T 主燃出口 -T 加力进口 )=m 换热器 ×(T 加力进口 -T 换热器 ) m 主燃 +m 换热器 =m 加力 Among them, m 主燃 is the main combustion chamber inlet flow rate, T 主燃出口 The main combustion chamber outlet theoretical temperature, T 加力进口 is the afterburner inlet temperature, m 加力 is the afterburner inlet flow rate.

9. The test method of the main combustion chamber and afterburner integrated test platform according to claim 8, characterized in that: The specific operation process of the test method is as follows: Working condition formulation method: S1.1 Sort the main combustion chamber operating parameters by outlet theoretical temperature in ascending order to generate List B, and sort the afterburner operating parameters by inlet temperature in ascending order to generate List A; S1.2 traverses list A. For each afterburner operating condition Ai, find the main combustor operating condition Bi from list B that minimizes the difference between the outlet temperature and the inlet temperature of Ai. Combine the operating condition Bi and the operating condition Ai and write them into a new table C. Delete the operating condition Bi from list B. S1.3 traverse the remaining operating conditions in List B. For each main combustion chamber operating condition Bj, find the afterburner operating condition Aj from List A that minimizes the difference between the inlet temperature and the outlet temperature of Bj. Combine the operating conditions Bj and Aj and write them into Table C. S1.4 Rearrange the combinations in Table C from smallest to largest according to afterburner inlet temperature; S1.5 Determine the heat exchanger parameters based on the heat balance equation and use the obtained heat exchanger inlet flow m 换热器 and temperature T 换热器 , generate an integrated verification condition table; Ignition starting method: S2.1 Adjust the flow valve, main heater and back pressure valve of the main air supply subsystem to ensure that the inlet flow, temperature and pressure of the main combustion chamber reach the ignition condition; S2.2 Adjust the flow valves of the auxiliary air supply subsystem, the bypass air supply subsystem, and the water system so that the heat exchanger inlet air flow, the back pressure valve water flow, and the afterburner heat shield cooling air volume reach the ignition operating conditions; S2.3 Start the main oil pump, adjust the flow valve of the main oil supply subsystem to the ignition fuel flow, switch the switching valve to the oil supply pipeline, and start the main combustion chamber igniter to complete ignition; S2.4 After the flame in the main combustion chamber stabilizes, start the auxiliary fuel pump, adjust the flow valve of the auxiliary fuel supply subsystem to the target fuel flow, switch the auxiliary fuel supply switching valve to the fuel supply pipeline, and complete the ignition of the afterburner; Steady-state control method: S3.1 Extract the target operating condition Hii from the integrated verification operating condition table and, starting with the current operating condition Hi, perform adjustments: If the afterburner fuel-air ratio at Hi is higher than Hii, prioritize adjusting the auxiliary air supply subsystem flow valve, the auxiliary fuel supply subsystem flow valve, and the bypass air supply subsystem flow valve to bring the afterburner operating condition closer to Hii; otherwise, prioritize adjusting the main combustion chamber operating condition: S3.11 If the main combustion chamber oil-air ratio of Hi is higher than Hii, first adjust the water system flow valve to the target water flow, then adjust the opening of the main air supply flow valve, main oil supply flow valve, and back pressure valve; S3.12 If the main combustion chamber oil-air ratio of Hi is lower than Hii, first adjust the opening of the main air supply flow valve, main oil supply flow valve and back pressure valve, and then adjust the water supply system flow valve; S3.2 Follow the gradient limit during the adjustment process; S3.3 Repeat the adjustment until the current working condition reaches the target working condition, and switch to the next target working condition after completion; How to shut down the engine: S4.1 Cut off the auxiliary fuel supply subsystem switching valve, close the auxiliary fuel pump and flow valve, increase the auxiliary air supply and bypass air supply flow to the maximum, and extinguish the afterburner; S4.2 Cut off the main fuel supply subsystem switching valve, shut down the main fuel pump and flow valve, set the back pressure valve opening to 100%, increase the main air supply flow to the maximum, and extinguish the main combustion chamber; S4.3 When the temperature of the heat exchanger section drops to the safety threshold of the pipeline material, shut down the auxiliary compressor and the bypass compressor; S4.4 When the temperature of the heat exchanger section further drops to the safety threshold of the back pressure valve without cooling, shut down the main compressor, water pump and measurement and control system, and cut off the platform power; Re-ignition method: S5.1 Main combustion chamber flameout treatment: S5.11 cuts off the main fuel supply switching valve to stop fuel supply to the main combustion chamber; S5.12 Adjust the auxiliary air supply, bypass air supply, and water system to ignition conditions according to step 2.2; S5.13 Adjust the main air supply and back pressure valve to ignition conditions according to step 2.1; S5.14 Re-ignites the main combustion chamber and restores steady-state control; S5.2 Afterburner flameout treatment: S5.21 cuts off the auxiliary fuel supply switching valve, stopping the fuel supply to the afterburner; S5.22 Adjust the auxiliary air supply, bypass air supply and water system to ignition conditions according to S2.2; S5.23 Adjust the main combustion chamber operating conditions to ignition conditions according to S2.1; S5.24 Re-ignites the afterburner and restores steady-state control.

10. The test method of the main combustion chamber and afterburner integrated test platform according to claim 9, characterized in that: In the steady-state control method, each adjustment amount of air flow and fuel flow does not exceed 10% of the current value, the air temperature adjustment amount does not exceed 50°C, the back pressure valve opening adjustment amount does not exceed 5%, and the water flow adjustment amount does not exceed 20%.

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