Oil supply and return fuel oil system for main combustion chamber ignition performance test and adjusting method

Abstract

The invention provides an oil supply and return fuel oil system for a main combustion chamber ignition performance test and an adjusting method, and belongs to the technical field of aero-engine tests, the oil supply and return fuel oil system comprises an oil storage tank, a fuel oil degassing device, a fuel oil pump, a plurality of flow meters with different measuring ranges, an electric heater, a gas-heat heat exchanger, an electromagnetic three-way valve, an adjustable throttling device and a plurality of adjusting valves, an inlet of the fuel pump is connected with the oil storage tank through the fuel degassing device, one path of an outlet of the fuel pump is connected to an oil return opening of the oil storage tank through the oil return adjusting valve, and the other path of the outlet of the fuel pump is connected to the flow meters with different measuring ranges through the oil supply adjusting valve, the back ends of the plurality of flowmeters with different measuring ranges are gathered and then are respectively connected with a normal-temperature flow path, a low-temperature pipeline and a heating flow path which are respectively formed by a normal-temperature test valve, a low-temperature test valve and a heating test valve which are arranged in parallel, the three flow paths are connected to a first port of an electromagnetic three-way valve, and a second port of the electromagnetic three-way valve is connected to a test piece; and the third port is connected to an oil return port of the oil storage tank through an adjustable throttling device.

Description

Technical Field

[0001] This application belongs to the field of aero-engine testing technology, and specifically relates to a fuel supply and return system and its adjustment method for testing the ignition performance of the main combustion chamber. Background Technology

[0002] The combustion chamber is a crucial core component of an aero-engine. Combustion chambers typically only function properly within specified airflow velocity, temperature, and pressure ranges. Under conditions of strong external disturbances or drastic changes in operating conditions, they can easily cause difficulties in starting and ignition, surge, or in-flight flameout. Therefore, at different stages of combustion chamber design and development, it is necessary to conduct numerous ignition / flameout performance verification tests to study the ignition / flameout performance of aero-engines.

[0003] The current fuel supply system for main combustion chamber ignition performance testing mainly consists of a fuel tank, fuel pump, flow meter, and solenoid three-way valve. The solenoid three-way valve is located before the inlet of the test specimen. During the fuel flow regulation phase, the solenoid three-way valve closes the fuel flow direction towards the test specimen and opens the flow direction towards the return fuel. Fuel flows out of the fuel tank, is pressurized by the fuel pump, and the flow rate is measured by the flow meter. It then flows back to the fuel tank through the return fuel line. During this process, the frequency of the fuel pump needs to be continuously changed to adjust the fuel flow until the required test conditions are met. During the testing phase, the solenoid three-way valve is controlled to open the fuel flow direction towards the test specimen and close the flow direction towards the return fuel. Fuel enters the test specimen, and after the fuel flow stabilizes, the ignition performance test begins, with fuel continuously flowing into the test specimen. If ignition fails, the fuel flow regulation phase begins, increasing the fuel flow in increments until successful ignition. If ignition succeeds, the fuel flow regulation phase begins again, decreasing the fuel flow in increments until ignition fails. The minimum fuel flow rate for successful ignition is recorded.

[0004] However, existing fuel supply systems have the following problems:

[0005] 1) When the return oil flows into the oil storage tank, it causes air bubbles in the fuel. When these air bubbles enter the fuel pump, they cause pump surge. When they enter the test piece, they cause vapor lock, which affects the test results.

[0006] 2) During the adjustment phase, frequent frequency changes of the fuel pump and long test times can lead to issues such as overheating of the frequency converter, unstable fuel pump performance, and large fluctuations in fuel flow, which can reduce the lifespan of the fuel pump and decrease the accuracy of test data.

[0007] 3) During the testing phase, fuel needs to flow continuously into the test piece. The ignition performance test can only begin after the flow rate stabilizes. This not only wastes fuel but also poses a risk of detonation.

[0008] 4) The flow meter of the fuel system is difficult to disassemble, which can easily damage the ball head and pressure cap, leading to oil leakage at the connection and reducing the efficiency of the test. Summary of the Invention

[0009] The purpose of this application is to provide a fuel supply and return system and adjustment method for testing the ignition performance of the main combustion chamber, so as to solve or mitigate at least one of the problems in the prior art.

[0010] The technical solution of this application is: a fuel supply and return system for main combustion chamber ignition performance testing, comprising: a fuel tank, a fuel degassing device, a fuel pump, multiple flow meters with different ranges, an electric heater, a gas-heat exchanger, a solenoid three-way valve, an adjustable throttling device, and multiple regulating valves, wherein:

[0011] The inlet of the fuel pump is connected to the fuel storage tank through a fuel degassing device. One outlet of the fuel pump is connected to the return port of the fuel storage tank through a return oil regulating valve, and the other outlet is connected to multiple flow meters with different ranges in parallel through a fuel supply regulating valve.

[0012] Multiple flow meters with different ranges connected in parallel are then connected to a room temperature test valve, a low temperature test valve, and a heating test valve, all also connected in parallel. The room temperature test valve forms a room temperature flow path, the low temperature test valve and the gas-heat exchanger located behind it form a low temperature pipeline, and the heating test valve and the electric heater located behind it form a heating flow path. The room temperature flow path, the low temperature flow path, and the heating flow path are connected to the first port of a solenoid three-way valve, the second port of the solenoid three-way valve is connected to the test piece, and the third port of the solenoid three-way valve is connected to the return port of the oil storage tank through an adjustable throttling device to form a return oil path.

[0013] In at least one embodiment of this application, the fuel degassing device is disposed between the outlet of the fuel storage tank and the inlet of the fuel pump, and is used to eliminate air or air bubbles present in the fuel drawn from the fuel storage tank in the pipeline. A first regulating valve and a second regulating valve are respectively disposed before and after the fuel degassing device.

[0014] In at least one embodiment of this application, each flow meter has a regulating valve at its front and rear ends.

[0015] In at least one embodiment of this application, a first pressure gauge is provided at the outlet of the fuel pump for monitoring the fuel pump outlet pressure.

[0016] In at least one embodiment of this application, a second pressure gauge is provided before the inlet of the test piece to monitor the inlet pressure of the test piece 200.

[0017] In at least one embodiment of this application, a thermometer is provided at the front end of the first port of the electromagnetic three-way valve for monitoring the fuel outflow temperature of the normal temperature flow path, the low temperature flow path, and the heating flow path.

[0018] In at least one embodiment of this application, the front and / or rear sides of multiple flow meters with different ranges are connected by metal tubes that meet the length requirements to ensure the stability of the measurement results.

[0019] In at least one embodiment of this application, the metal tube is a flexible metal tube.

[0020] In addition, this application also provides a method for adjusting the fuel supply and return system for the main combustion chamber ignition performance test as described above. The adjustment process includes fuel adjustment before the test and fuel supply adjustment during the test, wherein:

[0021] The pre-test fuel conditioning process includes:

[0022] S11, An adjustable throttling device is set according to the fuel nozzle opening pressure of the test piece;

[0023] S12, open the first regulating valve, the second regulating valve and the oil supply regulating valve;

[0024] S13, select and open the regulating valves before and after the flow meter with the appropriate range according to the test fuel flow requirements, and keep the regulating valves before and after the other flow meters closed.

[0025] S14. Select and open any appropriate normal temperature test valve, low temperature test valve or heating test valve according to the test fuel temperature requirements, and keep the regulating valves of the other channels closed.

[0026] S15, turn on the fuel pump. According to the test requirements, adjust the fuel pump to the predetermined power and keep it unchanged. At this time, the fuel flows through the fuel tank, the first regulating valve, the fuel degassing device, the second regulating valve, and the fuel pump. The fuel pump outlet pressure is measured by the first pressure gauge. Then, the fuel flow rate is measured by the fuel supply regulating valve and the selected flow meter. The fuel temperature is measured by the temperature gauge. After passing through the solenoid three-way valve and the adjustable throttling device, the fuel finally returns to the fuel tank. Gradually open the return fuel regulating valve. At this time, some fuel will return directly to the fuel tank through the return fuel regulating valve. The flow rate of the fuel supply line where the fuel supply regulating valve is located will gradually decrease to the fuel flow rate required for the test, thus completing the fuel adjustment before the test.

[0027] The fuel supply regulation process during the test phase includes:

[0028] S21. When the flow rate of the fuel supply pipeline where the fuel supply regulating valve is located is adjusted to the test state point, the solenoid three-way valve is controlled to allow fuel to enter the test piece and start the ignition performance test. The fuel supply pressure of the test piece is measured through the test piece inlet pressure measuring point formed by the second pressure gauge, and the fuel supply pressure and flow rate of the test piece are recorded.

[0029] S22 controls the solenoid three-way valve to allow fuel to re-enter the reservoir, and starts the adjustment of the next state point of the test piece according to the test requirements.

[0030] The fuel supply and return system for the main combustion chamber ignition performance test proposed in this application has the advantages of easy disassembly and long service life, stable fuel flow and high adjustment accuracy, good data repeatability, less fuel waste, and avoidance of detonation during the test. It meets both the flow meter installation requirements and the test requirements, greatly improves the test efficiency, saves the test cost, and also ensures the safety of test personnel and equipment. Attached Figure Description

[0031] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0032] Figure 1 This is a schematic diagram of the fuel supply and return system used for the main combustion chamber ignition performance test in this application. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings.

[0034] In order to eliminate air bubbles in the fuel system before the fuel enters the fuel pump, so that the fuel pump can maintain stable operation without frequent adjustments throughout the process, and to avoid frequent surges and drops in fuel flow after the fuel enters the test piece, thereby achieving rapid and stable fuel flow, this application provides a fuel supply and return system and adjustment method for main combustion chamber ignition performance testing.

[0035] like Figure 1 As shown, the fuel supply and return system 100 for the main combustion chamber ignition performance test provided in this application mainly includes: fuel tank 10, fuel degassing device 20, fuel pump 30, multiple flow meters with different ranges, electric heater 50, gas heat exchanger 60, electromagnetic three-way valve 70, adjustable throttling device 80 and multiple regulating valves.

[0036] The inlet of the fuel pump 30 is connected to the fuel storage tank 10 via a fuel degassing device 20, which supplies fuel from the fuel storage tank 10 to the test specimen 200. The fuel degassing device 20 is positioned between the outlet of the fuel storage tank 10 and the inlet of the fuel pump, and a first regulating valve 81 and a second regulating valve 82 are respectively installed before and after the fuel degassing device 20. The fuel degassing device 20 is used to eliminate air or air bubbles present in the fuel drawn from the fuel storage tank 10 within the pipeline.

[0037] One outlet of the fuel pump 30 is connected to the return port of the fuel tank 10 via a third regulating valve 83 (i.e., the return fuel regulating valve), and the other outlet is connected to multiple flow meters arranged in parallel via a fourth regulating valve 84 (i.e., the supply fuel regulating valve). For example, in this embodiment of the application, the flow meters arranged in parallel include a first flow meter 41, a second flow meter 42, and a third flow meter 43. The first flow meter 41, the second flow meter 42, and the third flow meter 43 are three different flow meters with different ranges and / or accuracies. The measurement range meets all main combustion chamber ignition performance tests, and the appropriate flow meter range can be selected and switched during the test as needed. For example, the range of the first flow meter 41 is approximately 0~100 m³ / h (accuracy approximately 1 m³ / h), the range of the second flow meter 42 is approximately 0 m³ / h~10 m³ / h (accuracy approximately 0.1 m³ / h), and the range of the third flow meter 43 is approximately 0~5 m³ / h (accuracy approximately 0.01 m³ / h). Each flow meter is equipped with a regulating valve before and after it—specifically, the first flow meter 41 is equipped with the fifth regulating valve 85 and the eighth regulating valve 88 before and after it, the second flow meter 42 is equipped with the sixth regulating valve 86 and the ninth regulating valve 89 before and after it, and the third flow meter 43 is equipped with the seventh regulating valve 87 and the tenth regulating valve 810 before and after it. By opening and closing the regulating valves before and after the corresponding flow meters, the accuracy of flow measurement can be improved, frequent replacement of flow meters under different requirements can be avoided, and test termination caused by flow meter failure during the test can also be avoided.

[0038] The parallel flow meters are connected to the eleventh regulating valve 811, the twelfth regulating valve 812, and the thirteenth regulating valve 813 in parallel. The eleventh regulating valve 811 (normal temperature test valve) forms a normal temperature flow path, the twelfth regulating valve 812 (low temperature test valve) and the gas-heat exchanger 60 behind it form a low temperature pipeline, and the thirteenth regulating valve 813 (heating test valve) and the electric heater 50 behind it form a heating flow path. The normal temperature flow path, the low temperature flow path, and the heating flow path are connected to the first port of the electromagnetic three-way valve 70. The second port of the electromagnetic three-way valve 70 is connected to the test piece 200. The third port of the electromagnetic three-way valve 70 is connected to the return oil port of the oil storage tank 10 through the adjustable throttling device 80 to form a return oil path. Before the test, an adjustable throttling device 80 is set according to the fuel nozzle opening pressure of the test piece 200. The adjustable throttling device 80 simulates the pressure difference between the nozzle inlet and outlet, preventing the fuel flow from rising and falling when the fuel enters the test piece 200 due to the switching solenoid three-way valve 70. The ignition performance test can start without waiting for the fuel flow to stabilize, ensuring the accuracy and stability of the fuel supply flow, improving the test precision and efficiency, reducing fuel waste, and preventing deflagration in the pipeline.

[0039] In this application, a first pressure gauge 91 is installed at the outlet of the fuel pump 30 to monitor the fuel pump outlet pressure, a second pressure gauge 92 is installed before the inlet of the test piece 200 to monitor the inlet pressure of the test piece 200, and a thermometer 93 is installed at the front end of the first port of the electromagnetic three-way valve 70 to monitor the fuel outflow temperature of the normal temperature flow path, the low temperature flow path and the heated flow path.

[0040] In some embodiments of this application, the front and / or rear sides of the three flow meters can be connected by metal pipes of the required length to ensure the stability of the measurement results. Preferably, the metal pipe can be a flexible metal tube, which facilitates the installation and disassembly of the flow meters and avoids damage to the ball head and pressure cap caused by the stress of the rigid pipe.

[0041] In some embodiments of this application, the third regulating valve 83 and the fourth regulating valve 84 may be electrically regulated valves, while the first regulating valve 81, the second regulating valve 82, and the fifth regulating valve 85 to the thirteenth regulating valve 813 may all be manually regulated valves.

[0042] The fuel supply and return system 100 of this application can supply fuel at normal temperature, fuel at low temperature and fuel at high temperature. During the test, the corresponding eleventh regulating valve 811 (normal temperature test valve), twelfth regulating valve 812 (low temperature test valve) and thirteenth regulating valve 813 (heating test valve) can be opened or closed as needed.

[0043] The fuel supply and return system of this application mainly includes fuel conditioning before the test and fuel supply conditioning during the test phase, wherein:

[0044] 1) The fuel conditioning process before the test includes:

[0045] S11, an adjustable throttling device 80 is set according to the fuel nozzle opening pressure of the test piece 200;

[0046] S12, open the first regulating valve 81, the second regulating valve 82 and the fourth regulating valve 84;

[0047] S13, select and open the regulating valves before and after the flow meter with the appropriate range according to the test fuel flow requirements, and keep the regulating valves before and after the other flow meters closed.

[0048] S14. Select and open any appropriate normal temperature test valve, low temperature test valve or heating test valve according to the test fuel temperature requirements, and keep the regulating valves of the other channels closed.

[0049] S15, turn on fuel pump 30. According to the test requirements, adjust fuel pump 30 to the predetermined power and keep it unchanged. At this time, the fuel flow direction is: fuel tank 10 → first regulating valve 81 → fuel degassing device 20 → second regulating valve 82 → fuel pump 30 → first pressure gauge 91 (i.e., the fuel pump outlet pressure measuring point can measure the fuel pump 30 outlet pressure) → fourth regulating valve 84 → selected flow meter to measure fuel flow → temperature gauge 93 (i.e., fuel temperature measuring point to measure fuel temperature) → solenoid three-way valve 70 → adjustable throttling device 80 → fuel tank 10. Gradually open the third regulating valve 83 (return fuel regulating valve). At this time, some fuel will pass through → third regulating valve 83 → directly return to fuel tank 10. The flow of the fuel supply line where the fourth regulating valve 84 is located will gradually decrease to the fuel flow required for the test, completing the fuel adjustment before the test.

[0050] Since the fuel pump 30 operates at a predetermined power during the test, there is no need to frequently adjust the power of the fuel pump 30 to change the fuel flow rate. This prevents the fuel pump 30 from becoming unstable due to heat generation from the fuel pump 30 and the frequency converter during long-term testing. It also avoids damage caused by the fuel pump 30 operating under non-rated conditions for a long time, thus extending the service life of the fuel pump 30.

[0051] The adjustment method of this application improves the adjustment accuracy of fuel flow by 8% to 23%, the adjustment efficiency by 30% to 50%, and is more stable when the fuel supply flow is low.

[0052] 2) The fuel supply regulation process during the test phase includes:

[0053] S21, when the flow rate of the fuel supply line where the fourth regulating valve 84 is located is adjusted to the test state point, the electromagnetic three-way valve 70 is controlled to allow fuel to enter the test piece 200 and the ignition performance test is started. The fuel supply pressure of the test piece 200 is measured through the test piece inlet pressure measuring point formed by the second pressure gauge 92, and the fuel supply pressure and flow rate of the test piece 200 are recorded.

[0054] S22, control the solenoid three-way valve 70 to allow fuel to re-enter the oil reservoir 10, and start the adjustment of the next state point of the test piece according to the test requirements.

[0055] This application provides a highly efficient, energy-saving, and stable fuel supply and return system and adjustment method for main combustion chamber ignition performance testing. It has the advantages of easy disassembly and long service life, stable fuel flow and high adjustment accuracy, good data repeatability, less fuel waste, and avoidance of deflagration during the test. It meets both the flow meter installation requirements and the test requirements, greatly improves the test efficiency, saves the test cost, and also ensures the safety of test personnel and equipment.

[0056] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A fuel supply and return system for testing the ignition performance of the main combustion chamber, characterized in that, include: The fuel storage tank (10), fuel degassing device (20), fuel pump (30), multiple flow meters with different ranges, electric heater (50), gas heat exchanger (60), electromagnetic three-way valve (70), adjustable throttling device (80), and multiple regulating valves, wherein: The inlet of the fuel pump (30) is connected to the oil storage tank (10) through the fuel degassing device (20). One outlet of the fuel pump (30) is connected to the return port of the oil storage tank (10) through the return oil regulating valve, and the other outlet is connected to multiple flow meters with different ranges in parallel through the oil supply regulating valve. Multiple flow meters with different ranges are connected in parallel and then connected to a normal temperature test valve, a low temperature test valve, and a heating test valve. The normal temperature test valve forms a normal temperature flow path, the low temperature test valve and the gas heat exchanger (60) set behind the low temperature test valve form a low temperature pipeline, and the heating test valve and the electric heater (50) set behind the heating test valve form a heating flow path. The normal temperature flow path, the low temperature flow path and the heating flow path are connected to the first port of the electromagnetic three-way valve (70), the second port of the electromagnetic three-way valve (70) is connected to the test piece (200), and the third port of the electromagnetic three-way valve (70) is connected to the return port of the oil storage tank (10) through an adjustable throttling device (80) to form a return oil path.

2. The fuel supply and return system for main combustion chamber ignition performance testing as described in claim 1, characterized in that, The fuel degassing device (20) is located between the outlet of the fuel storage tank and the inlet of the fuel pump, and is used to eliminate air or air bubbles present in the fuel drawn from the fuel storage tank (10) in the pipeline. A first regulating valve (81) and a second regulating valve (82) are respectively installed before and after the fuel degassing device (20).

3. The fuel supply and return system for main combustion chamber ignition performance testing as described in claim 1, characterized in that, Each flow meter has a regulating valve at both its front and rear ends.

4. The fuel supply and return system for main combustion chamber ignition performance testing as described in claim 1, characterized in that, The fuel pump (30) is equipped with a first pressure gauge (91) at its outlet to monitor the fuel pump outlet pressure.

5. The fuel supply and return system for main combustion chamber ignition performance testing as described in claim 4, characterized in that, A second pressure gauge (92) is installed before the inlet of the test piece (200) to monitor the inlet pressure of the test piece 200.

6. The fuel supply and return system for main combustion chamber ignition performance testing as described in claim 5, characterized in that, The first port of the electromagnetic three-way valve (70) is equipped with a thermometer (93) for monitoring the fuel outflow temperature of the normal temperature flow path, the low temperature flow path and the heating flow path.

7. The fuel supply and return system for main combustion chamber ignition performance testing as described in claim 1, characterized in that, Multiple flow meters with different ranges are connected at the front and / or rear by metal tubes of the required length to ensure the stability of the measurement results.

8. The fuel supply and return system for main combustion chamber ignition performance testing as described in claim 7, characterized in that, The metal tube is a flexible metal tube.

9. A method for adjusting a fuel supply and return system for a main combustion chamber ignition performance test as described in any one of claims 1-8, characterized in that, The adjustment process includes pre-test fuel adjustment and test-stage fuel supply adjustment, wherein: The pre-test fuel conditioning process includes: S11, an adjustable throttle device (80) is set according to the fuel nozzle opening pressure of the test piece (200). S12, open the first regulating valve (81), the second regulating valve (82) and the oil supply regulating valve; S13, select and open the regulating valves before and after the flow meter with the appropriate range according to the test fuel flow requirements, and keep the regulating valves before and after the other flow meters closed. S14. Select and open any appropriate normal temperature test valve, low temperature test valve or heating test valve according to the test fuel temperature requirements, and keep the regulating valves of the other channels closed. S15, turn on the fuel pump (30). According to the test requirements, adjust the fuel pump (30) to the predetermined power and keep it unchanged. At this time, the fuel flows along the oil storage tank (10), the first regulating valve (81), the fuel degassing device (20), the second regulating valve (82), and the fuel pump (30). The fuel pump outlet pressure is measured by the first pressure gauge (91). Then, the fuel flow rate is measured along the fuel supply regulating valve and the selected flow meter. The fuel temperature is measured by the temperature gauge (93). After passing through the electromagnetic three-way valve (70) and the adjustable throttling device (80), the fuel finally returns to the oil storage tank (10). Gradually open the return oil regulating valve. At this time, some fuel will return directly to the oil storage tank (10) through the return oil regulating valve. The flow rate of the fuel supply pipeline where the fuel supply regulating valve is located will gradually decrease to the fuel flow rate required for the test, and the fuel adjustment before the test is completed. The fuel supply regulation process during the test phase includes: S21, when the flow rate of the fuel supply pipeline where the fuel supply regulating valve is located is adjusted to the test state point, the electromagnetic three-way valve (70) is controlled to allow fuel to enter the test piece (200) and the ignition performance test is started. The fuel supply pressure of the test piece (200) is measured by the test piece inlet pressure measuring point formed by the second pressure gauge (92), and the fuel supply pressure and flow rate of the test piece (200) are recorded. S22, control the solenoid three-way valve (70) to allow fuel to re-enter the oil storage tank (10), and start the adjustment of the next state point of the test piece according to the test requirements.

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