An air supply system for high-altitude environmental simulation tests and its adjustment method

Abstract

The present invention relates to an air supply system and an adjustment method for high-altitude environment simulation tests, aiming to solve the technical problems that the existing control methods cannot accurately control the startup, rising rate, and stability of heating devices according to PID parameters. The system includes a high-pressure gas storage system, a high-pressure delivery system, and a pressure regulation module including a heater air supply pressure regulation unit and a mixer air supply pressure regulation unit. The method obtains the relationship curve between the valve opening and the pressure to obtain a preset opening. At the same time, based on the pressure regulating valve control system and the regulator control system using the PID algorithm, the air conditioning system has a faster startup pressure stabilization time and higher dynamic regulation accuracy.

Description

Technical Field

[0001] The present invention relates to an air supply device for high-altitude environment simulation tests, and particularly to an air supply system and adjustment method for high-altitude environment simulation tests. Background Art

[0002] In the ground test research of a ramjet engine, it is required that the test device can simulate the Mach number, pressure, temperature and angle of attack conditions during flight. Therefore, the test bench must provide a large flow of high-temperature gas, and the gas composition should be the same as that of "real air".

[0003] The ambient incoming flow simulation system is used to form the incoming flow conditions required for the engine test. The incoming air is heated by using a medium combustion method in the heating device. The heating device consists of a heater and a mixer. The high-temperature gas generated by the combustion of the medium in the heater heats the air supplied by the air supply system, and then a certain flow of cold air is supplemented through the mixer to ensure that the air flow and total temperature of the heating device meet the test requirements. At the same time, the temperature distribution of the heated air is made uniform, and finally it is accelerated and expanded by the jet nozzle to generate a uniform flow field that meets the requirements.

[0004] To ensure that the heating device generates a uniform flow field, an air supply system and related control technologies are required to ensure that high-pressure and large-flow air required for operation is provided to the heater and mixer, so as to ensure the formation of the interference incoming flow finally required for the high-altitude simulation test of the ramjet engine. However, the PID parameters have different characteristics in the stable execution section and the start-up and adjustment sections of the test, and the problem of being unable to accurately control its start-up, rising rate and stability characteristics results in the inability of the air conditioning system to quickly stabilize the starting pressure, seriously affecting the test progress and results. Summary of the Invention

[0005] In order to solve the technical problems that the existing control methods cannot accurately control the start-up, rising rate and stability of the heating device according to the PID parameters, the present invention proposes an air supply system and adjustment method for high-altitude environment simulation tests.

[0006] The technical solution provided by the present invention is as follows:

[0007] An air supply system for high-altitude environment simulation tests, which is characterized in that it includes a high-pressure gas storage system, a high-pressure transmission system and a pressure regulation module;

[0008] The high-pressure gas storage system is used to provide high-pressure air; the high-pressure transmission system is connected to the high-pressure gas storage system and is used to transport the required air to the pressure regulation module;

[0009] The pressure regulation module includes a heater air supply pressure regulation unit and a mixer air supply pressure regulation unit;

[0010] The heater air supply pressure regulating unit includes a first pressure regulating component, a second pressure regulating component and a first orifice plate connected in parallel. The first pressure regulating component includes a third electric valve and a first pressure regulating valve connected thereto. The third electric valve is connected to the high-pressure delivery system, and the first pressure regulating valve is connected to the heater. A pressure gauge and a thermometer are provided between the first pressure regulating valve and the heater; the second pressure regulating component includes a fourth electric valve and a second pressure regulating valve connected thereto. The fourth electric valve is connected to the high-pressure delivery system, and the second pressure regulating valve is connected to the heater. A pressure gauge and a thermometer are provided between the second pressure regulating valve and the heater; a first isolation valve is provided between the first pressure regulating valve and the heater; the first orifice plate is provided at the heater inlet for passing air output from the first pressure regulating valve and the second pressure regulating valve.

[0011] The mixer air supply pressure regulating unit includes a first regulator, a second regulator, a third pressure regulating component, a fourth pressure regulating component connected in parallel, and a second orifice plate provided at the mixer inlet;

[0012] The third pressure regulating component includes a sixth electric valve and a third pressure regulating valve connected thereto. The sixth electric valve is connected to the high-pressure delivery system, and the third pressure regulating valve is connected to the mixer; the fourth pressure regulating component includes a fifth electric valve, a first pressure reducer, a second pressure reducer and a second isolation valve. The fifth electric valve is connected to the fourth electric valve. The input ends of the first pressure reducer and the second pressure reducer are both connected to the output end of the fifth electric valve. The output ends of the first pressure reducer and the second pressure reducer are both connected to the second isolation valve. The second isolation valve is connected to the mixer. The input end of the fifth electric valve is connected between the fourth electric valve and the second pressure regulating valve; the driving end and the input end of the first regulator are both connected to the high-pressure delivery system, and the output end is connected to the driving end of the first pressure reducer; the driving end and the input end of the second regulator are both connected to the high-pressure delivery system, and the output end is connected to the driving end of the second pressure reducer; the second orifice plate is used for passing air output from the third pressure regulating component and the fourth pressure regulating component.

[0013] The first pressure regulating valve, the second pressure regulating valve and the third pressure regulating valve are all connected to a pressure regulating valve control system; the first regulator and the second regulator are both connected to a regulator control system.

[0014] Further, the Cv value of the flow passage of the second pressure regulating valve is greater than the Cv value of the flow passage of the first pressure regulating valve;

[0015] The Cv value of the flow passage of the third pressure regulating valve is greater than the Cv values of the flow passages of the first pressure reducer and the second pressure reducer.

[0016] Further, the high-pressure delivery system includes a first electric valve, a filter, a second electric valve, a manual pressure reducer and a second manual valve;

[0017] One end of the first electric valve is connected to the high-pressure gas storage system, and the other end is connected to the filter. The filter is connected to the third electric valve, the fourth electric valve and the sixth electric valve;

[0018] One end of the second electric valve is connected to the high-pressure gas storage system, and the other end is connected to both the input ends of the first regulator and the second regulator;

[0019] One end of the manual pressure reducer is connected to the high-pressure gas storage system, and the other end is connected to the second manual valve. The second manual valve is connected to the driving ends of both the first regulator and the second regulator.

[0020] Furthermore, the high-pressure gas storage system includes a high-pressure gas storage tank group and a first manual valve connected to the high-pressure gas storage tank group. The first manual valve is connected to the first electric valve, the second electric valve, and the manual pressure reducer.

[0021] Furthermore, the pressure regulating valve control system adopts a PID algorithm to adjust the opening degrees of the first pressure regulating valve, the second pressure regulating valve, and the third pressure regulating valve in real time; the regulator control system adopts a PID algorithm to adjust the control gas of the first regulator and the second regulator in real time.

[0022] The present invention also provides a regulation method for an air supply system for high-altitude environment simulation tests, which is characterized in that the above-mentioned air supply system for high-altitude environment simulation tests is adopted, and it includes the following steps:

[0023] S1. According to the required air pressure ranges of the heaters and the mixer, determine a plurality of heater target pressures and a plurality of mixer target pressures; and according to each heater target pressure, determine the corresponding initial debugging aperture of the first orifice plate, and according to each mixer target pressure, determine the corresponding initial debugging aperture of the second orifice plate;

[0024] S2. Start the pressure regulating valve control system and the regulator control system, and open the high-pressure gas storage system and the high-pressure transmission system;

[0025] S3. Select the current heater target pressure and the current mixer target pressure;

[0026] S4. Open the first pressure regulating component and the second pressure regulating component. According to the current heater target pressure, adjust the output pressures of the first pressure regulating valve and the second pressure regulating valve through the pressure regulating valve control system to obtain the opening degrees of the first pressure regulating valve and the second pressure regulating valve when the output pressures of the first pressure regulating valve and the second pressure regulating valve are the current heater target pressure; according to the measurement results of the pressure gauge and the thermometer, obtain the actual aperture of the corresponding first orifice plate under the current heater target pressure;

[0027] Turn on the first regulator, the second regulator, the third pressure regulating component, and the fourth pressure regulating component. According to the current mixer target pressure, adjust the output pressures of the third pressure regulating valve, the first pressure reducer, and the second pressure reducer through the pressure regulating valve control system and the regulator control system to obtain the opening degrees of the third pressure regulating valve, the first pressure reducer, and the second pressure reducer corresponding to the output pressures of the third pressure regulating valve, the first pressure reducer, and the second pressure reducer being the current mixer target pressure respectively; According to the measurement results of the pressure gauge and the thermometer, obtain the actual aperture of the second orifice plate corresponding to the current mixer target pressure.

[0028] S5. Return to step S3, reselect the current heater target pressure and the current mixer target pressure until the opening degrees of the first pressure regulating valve and the second pressure regulating valve are obtained under each group of heater target pressures, construct the first relationship curve between the opening degree of the first pressure regulating valve and the corresponding output pressure, the second relationship curve between the opening degree of the second pressure regulating valve and the corresponding output pressure, and determine the relationship formula between the actual aperture of the first orifice plate and the flow rate and pressure.

[0029] Obtain the opening degrees of the third pressure regulating valve, the first pressure reducer, and the second pressure reducer under each group of mixer target pressures, construct the third relationship curve between the opening degree of the third pressure regulating valve and the corresponding output pressure, the fourth relationship curve between the opening degree of the first pressure reducer and the corresponding output pressure, the fifth relationship curve between the second pressure reducer and the corresponding output pressure, and determine the relationship formula between the actual aperture of the second orifice plate and the flow rate and pressure.

[0030] Turn off the pressure regulating valve control system, the regulator control system, the high-pressure gas storage system, the high-pressure transmission system, and the pressure regulating module.

[0031] S6. Start the high-altitude environment simulation test, and turn on the pressure regulating valve control system, the regulator control system, and the pressure regulating module.

[0032] S7. Based on the actual air pressure demand of the current heater in the high-altitude environment simulation test, obtain the preset opening degrees of the first pressure regulating valve and the second pressure regulating valve according to the first relationship curve and the second relationship curve in step S5, and set the first pressure regulating valve and the second pressure regulating valve according to the preset opening degrees; Determine the corresponding actual aperture of the first orifice plate according to the relationship formula between the actual aperture of the first orifice plate and the flow rate and pressure.

[0033] Based on the actual air pressure demand of the current mixer, obtain the preset opening degrees of the third pressure regulating valve, the first pressure reducer, and the second pressure reducer according to the third relationship curve, the fourth relationship curve, and the fifth relationship curve in step S5, and set the third pressure regulating valve, the first pressure reducer, and the second pressure reducer according to the preset opening degrees; Determine the corresponding actual aperture of the second orifice plate according to the relationship formula between the actual aperture of the second orifice plate and the flow rate and pressure.

[0034] S8. Turn on the high-pressure gas storage system and the high-pressure transmission system, and input air to the heater.

[0035] If the input pressure of the heater does not meet the requirements, adjust the input pressure of the heater by adjusting the first regulating valve or the second regulating valve;

[0036] Meanwhile, input air into the mixer. If the input pressure of the mixer does not meet the requirements, adjust the input pressure of the mixer by adjusting the third regulating valve or the first pressure reducer or the second pressure reducer;

[0037] S9. Return to step S7, re-determine the actual air pressure requirements of the heater and the mixer according to the requirements of the high-altitude environment simulation test parameters, and obtain the actual air pressure requirements of the current heater and mixer again until the high-altitude environment simulation test ends.

[0038] Further, in step S8, if the input pressure of the heater does not meet the requirements, adjust the input pressure of the heater by adjusting the first regulating valve or the second regulating valve. Specifically:

[0039] Calculate the actual flow rate of the air input into the heater according to the pressure corresponding to the preset opening, the air density at this pressure, and the aperture of the first orifice plate, and adjust the input air pressure of the heater according to the difference ΔQ1 between the actual flow rate and the target heater flow rate;

[0040] If the opening adjustment range of the first regulating valve corresponding to ΔQ1 is within the optimized opening range of the first regulating valve, then use the first regulating valve to adjust the input pressure of the heater until the input air pressure meets the requirements of the heater;

[0041] If the opening adjustment range of the first regulating valve corresponding to ΔQ1 is outside the optimized opening range of the first regulating valve, then use the second regulating valve to adjust the input pressure of the heater until the input air pressure meets the requirements of the heater.

[0042] Further, in step S8, if the input pressure of the mixer does not meet the requirements, adjust the input pressure of the mixer by adjusting the third regulating valve or the first pressure reducer or the second pressure reducer. Specifically:

[0043] Calculate the actual flow rate of the air input into the mixer according to the pressure corresponding to the preset opening, the air density at this pressure, and the aperture of the second orifice plate, and adjust the input air pressure of the mixer according to the difference ΔQ2 between the actual flow rate and the target mixer flow rate;

[0044] If the opening adjustment range of the first pressure reducer or the second pressure reducer corresponding to ΔQ2 is within the optimized opening range of the first pressure reducer or the second pressure reducer, then use the first pressure reducer or the second pressure reducer to adjust the input pressure of the heater until the air pressure meets the requirements of the mixer;

[0045] If the opening adjustment range of the first pressure reducer or the second pressure reducer corresponding to ΔQ2 is outside the optimized opening range of the first pressure reducer or the second pressure reducer, the first pressure reducer and the second pressure reducer are simultaneously used to adjust the heater flow rate until the air pressure meets the requirements of the mixer;

[0046] If the opening adjustment ranges of the first pressure reducer and the second pressure reducer corresponding to ΔQ2 are both outside the optimized opening ranges of the first pressure reducer and the second pressure reducer, the third pressure regulating valve is used to adjust the heater flow rate until the air pressure meets the requirements of the mixer. Further, in step S7, the optimized opening ranges of the first regulating valve, the first pressure reducer, and the second pressure reducer are 10%-85% of the corresponding maximum opening.

[0047] Advantages of the present invention:

[0048] 1. The present invention adopts a parallel adjustment and matching combination technology in which the first pressure regulating assembly and the second pressure regulating assembly are arranged in parallel, and the third pressure regulating assembly and the fourth pressure regulating assembly are arranged in parallel, realizing synchronous and rapid adjustment of the air supply of the heater and the mixer, and improving both the adjustment range and the adjustment accuracy.

[0049] 2. The adjustment method provided by the present invention obtains the preset opening by obtaining the relationship curve between the valve opening and the pressure. At the same time, based on the pressure regulating valve control system and the regulator control system using the PID algorithm, the start-up pressure stabilization time of the air conditioning system is shortened from the traditional 6 seconds to 2 seconds, and the dynamic adjustment accuracy reaches 3%.

[0050] 3. By pre-setting the opening with the pressure curve of the first pressure regulating valve, the second pressure regulating valve, the third pressure regulating valve, the first pressure reducer and the second pressure reducer of the adjustment module, the test system can better meet the requirements of the flow deviation under various working conditions, and at the same time greatly reduce the cold adjustment workload.

[0051] 4. The present invention adopts modular combination, simplifies the test process system, makes full use of system resources, and avoids waste. Description of the Drawings

[0052] Figure 1 It is a schematic structural diagram of the air supply system for high-altitude environment simulation test of the present invention. Detailed Embodiments

[0053] See Figure 1 , this embodiment provides an air supply system for high-altitude environment simulation test, which includes a high-pressure gas storage system, a high-pressure transmission system and a pressure regulating module;

[0054] The pressure regulating module includes a heater air supply pressure regulating unit and a mixer air supply pressure regulating unit;

[0055] The heater air supply pressure regulating unit includes a first pressure regulating component, a second pressure regulating component and a first orifice plate connected in parallel. The first pressure regulating component includes a third electric valve and a first pressure regulating valve connected thereto. The third electric valve is connected to the high-pressure delivery system, and the first pressure regulating valve is connected to the heater. A pressure gauge and a thermometer are provided between the first pressure regulating valve and the heater. The second pressure regulating component includes a fourth electric valve and a second pressure regulating valve connected thereto. The fourth electric valve is connected to the high-pressure delivery system, and the second pressure regulating valve is connected to the heater. A pressure gauge and a thermometer are provided between the second pressure regulating valve and the heater. A first isolation valve is provided between the first pressure regulating valve and the heater. The first orifice plate is provided at the heater inlet for passing the air output from the first pressure regulating valve and the second pressure regulating valve. The flow Cv value of the second pressure regulating valve is greater than that of the first pressure regulating valve. By providing two pressure regulating valves connected in parallel and setting the flow Cv value of the first pressure regulating valve to a small value, precise adjustment of the pressure and flow rate during the experiment can be achieved, and the adjustment range can be increased.

[0056] The mixer air supply pressure regulating unit includes a first regulator, a second regulator, a third pressure regulating component, a fourth pressure regulating component and a second orifice plate provided at the mixer inlet, all of which are connected in parallel.

[0057] The third pressure regulating component includes a sixth electric valve and a third pressure regulating valve connected thereto. The sixth electric valve is connected to the high-pressure delivery system, and the third pressure regulating valve is connected to the mixer. The fourth pressure regulating component includes a fifth electric valve, a first pressure reducer, a second pressure reducer and a second isolation valve. The fifth electric valve is connected to the fourth electric valve. The input ends of the first pressure reducer and the second pressure reducer are both connected to the output end of the fifth electric valve. The output ends of the first pressure reducer and the second pressure reducer are both connected to the second isolation valve. The second isolation valve is connected to the mixer. The input end of the fifth electric valve is connected between the fourth electric valve and the second pressure regulating valve. The driving end and the input end of the first regulator are both connected to the high-pressure delivery system, and the output end is connected to the driving end of the first pressure reducer. The driving end and the input end of the second regulator are both connected to the high-pressure delivery system, and the output end is connected to the driving end of the second pressure reducer. The second orifice plate is used for passing the air output from the third pressure regulating component and the fourth pressure regulating component. The flow Cv value of the third pressure regulating valve is greater than that of the first pressure reducer and also greater than that of the second pressure reducer, which also increases the adjustment range and adjustment accuracy. Generally, rough adjustment is performed through the third pressure regulating valve, and fine adjustment is performed using the first pressure reducer and / or the second pressure reducer.

[0058] The first pressure regulating valve, the second pressure regulating valve and the third pressure regulating valve are all connected to a pressure regulating valve control system. The pressure regulating valve control system uses a hydraulic servo system to provide a hydraulic driving source for the pressure regulating valve and adopts a PID algorithm to perform real-time adjustment of the opening degrees of the first pressure regulating valve, the second pressure regulating valve and the third pressure regulating valve. The first regulator and the second regulator are both connected to a regulator control system. The regulator control system adopts a PID algorithm to perform real-time adjustment of the control air of the first regulator and the second regulator.

[0059] The high-pressure gas storage system is used to provide high-pressure air; the high-pressure gas storage system includes a high-pressure gas storage tank group and a first manual valve connected to the high-pressure gas storage tank group, and the first manual valve is connected to a first electric valve, a second electric valve, and a manual pressure reducer.

[0060] The high-pressure delivery system is connected to the high-pressure gas storage system and is used to deliver the required air to the pressure regulating module; the high-pressure delivery system includes a first electric valve, a filter, a second electric valve, a manual pressure reducer, and a second manual valve; one end of the first electric valve is connected to the high-pressure gas storage system, and the other end is connected to the filter, and the filter is connected to a third electric valve, a fourth electric valve, and a sixth electric valve; one end of the second electric valve is connected to the high-pressure gas storage system, and the other end is connected to the input ends of a first regulator and a second regulator; one end of the manual pressure reducer is connected to the high-pressure gas storage system, and the other end is connected to the second manual valve, and the second manual valve is connected to the driving ends of the first regulator and the second regulator.

[0061] The adjustment method of the above air supply system for high-altitude environment simulation test includes the following steps:

[0062] S1. Determine a plurality of heater target pressures and a plurality of mixer target pressures according to the required air pressure ranges of the heaters and the mixer; and determine the corresponding initial debugging orifice diameters of the first orifice plates according to each heater target pressure, and determine the corresponding initial debugging orifice diameters of the second orifice plates according to each mixer target pressure;

[0063] S2. Start the pressure regulating valve control system and the regulator control system, and open the high-pressure gas storage system and the high-pressure delivery system;

[0064] S3. Select the current heater target pressure and the current mixer target pressure;

[0065] S4. Open the first pressure regulating component and the second pressure regulating component, and according to the current heater target pressure and the corresponding initial debugging orifice diameter of the first orifice plate, adjust the output pressures of the first pressure regulating valve and the second pressure regulating valve through the pressure regulating valve control system to obtain the opening degrees of the first pressure regulating valve and the second pressure regulating valve when the output pressures of the first pressure regulating valve and the second pressure regulating valve are the current heater target pressure; according to the measurement results of the pressure gauge and the thermometer, obtain the actual orifice diameter of the corresponding first orifice plate under the current heater target pressure;

[0066] Turn on the first regulator, the second regulator, the third pressure regulating component and the fourth pressure regulating component. According to the current mixer target pressure and the corresponding initial debugging aperture of the second orifice plate, adjust the output pressures of the third pressure regulating valve, the first pressure reducer and the second pressure reducer through the pressure regulating valve control system and the regulator control system, and obtain the opening degrees of the third pressure regulating valve, the first pressure reducer and the second pressure reducer corresponding to the output pressures of the third pressure regulating valve, the first pressure reducer and the second pressure reducer being the current mixer target pressure respectively; According to the measurement results of the pressure gauge and the thermometer, obtain the actual aperture of the corresponding second orifice plate under the current mixer target pressure.

[0067] S5. Return to step S3, reselect the current heater target pressure and the current mixer target pressure until the opening degrees of the first pressure regulating valve and the second pressure regulating valve under each group of heater target pressures are obtained, construct the first relationship curve between the opening degree of the first pressure regulating valve and the corresponding output pressure, the second relationship curve between the opening degree of the second pressure regulating valve and the corresponding output pressure, and determine the relationship formula between the actual aperture of the first orifice plate and the flow rate and pressure.

[0068] Obtain the opening degrees of the third pressure regulating valve, the first pressure reducer and the second pressure reducer under each group of mixer target pressures, construct the third relationship curve between the opening degree of the third pressure regulating valve and the corresponding output pressure, the fourth relationship curve between the opening degree of the first pressure reducer and the corresponding output pressure, the fifth relationship curve between the second pressure reducer and the corresponding output pressure, and determine the relationship formula between the actual aperture of the second orifice plate and the flow rate and pressure.

[0069] Turn off the pressure regulating valve control system, the regulator control system, the high-pressure gas storage system, the high-pressure transmission system and the pressure regulating module.

[0070] S6. Start the high-altitude environment simulation test, and turn on the pressure regulating valve control system, the regulator control system and the pressure regulating module.

[0071] S7. Based on the actual air pressure demand of the current heater in the high-altitude environment simulation test, obtain the preset opening degrees of the first pressure regulating valve and the second pressure regulating valve according to the first relationship curve and the second relationship curve in step S5, and set the first pressure regulating valve and the second pressure regulating valve according to the preset opening degrees. Determine the actual aperture of the corresponding first orifice plate according to the relationship formula between the actual aperture of the first orifice plate and the flow rate and pressure.

[0072] Based on the actual air pressure demand of the current mixer, obtain the preset opening degrees of the third pressure regulating valve, the first pressure reducer and the second pressure reducer according to the third relationship curve, the fourth relationship curve and the fifth relationship curve in step S5, and set the third pressure regulating valve, the first pressure reducer and the second pressure reducer according to the preset opening degrees. Determine the actual aperture of the corresponding second orifice plate according to the relationship formula between the actual aperture of the second orifice plate and the flow rate and pressure.

[0073] S8. Open the high-pressure gas storage system and the high-pressure delivery system, and input air into the heater. If the input pressure of the heater does not meet the requirements, adjust the input pressure of the heater by adjusting the first regulating valve or the second regulating valve. Specifically: Calculate the actual flow rate of the air input into the heater based on the pressure corresponding to the preset opening, the air density at this pressure, and the aperture of the first orifice plate. Adjust the input air pressure of the heater according to the difference ΔQ1 between the actual flow rate and the target heater flow rate. If the opening adjustment range of the first regulating valve corresponding to ΔQ1 is within the optimized opening range of the first regulating valve, then use the first regulating valve to adjust the input pressure of the heater until the input air pressure meets the requirements of the heater. If the opening adjustment range of the first regulating valve corresponding to ΔQ1 is outside the optimized opening range of the first regulating valve, then close the first isolation valve and use the second regulating valve to adjust the input pressure of the heater until the input air pressure meets the requirements of the heater. The optimized opening range of the first regulating valve is 10% - 85% of the maximum opening of the first regulating valve. That is to say, the valve opening is not greater than 85% at the maximum flow rate and not less than 10% at the minimum flow rate, ensuring that the required parameters are within the flow range of the regulating valve, thereby optimizing the regulating performance of the valve.

[0074] Meanwhile, input air into the mixer. If the input pressure of the mixer does not meet the requirements, adjust the input pressure of the mixer by adjusting the third regulating valve, the first pressure reducer, or the second pressure reducer. Specifically: Calculate the actual flow rate of the air input into the mixer based on the pressure corresponding to the preset opening, the air density at this pressure, and the aperture of the second orifice plate. Adjust the input air pressure of the mixer according to the difference ΔQ2 between the actual flow rate and the target mixer flow rate. If the opening adjustment range of the first pressure reducer or the second pressure reducer corresponding to ΔQ2 is within the optimized opening range of the first pressure reducer or the second pressure reducer, then use the first pressure reducer or the second pressure reducer to adjust the input pressure of the heater until the air pressure meets the requirements of the mixer. If the opening adjustment range of the first pressure reducer or the second pressure reducer corresponding to ΔQ2 is outside the optimized opening range of the first pressure reducer or the second pressure reducer, then use the first pressure reducer and the second pressure reducer simultaneously to adjust the heater flow rate until the air pressure meets the requirements of the mixer. If the opening adjustment ranges of the first pressure reducer and the second pressure reducer corresponding to ΔQ2 are both outside the optimized opening ranges of the first pressure reducer and the second pressure reducer, then close the second isolation valve and use the third pressure regulating valve to adjust the heater flow rate until the air pressure meets the requirements of the mixer. Among them, the optimized opening ranges of the first pressure reducer and the second pressure reducer are 10% - 85% of the corresponding maximum openings.

[0075] S9. Return to step S7, re-determine the actual air pressure requirements of the heater and the mixer according to the requirements of the high-altitude environment simulation test parameters, and obtain the actual air pressure requirements of the current heater and mixer again until the high-altitude environment simulation test ends.

[0076] The air supply system for high-altitude environmental simulation tests provided in this embodiment can shorten the start-up pressure stabilization time to 2 s, and the dynamic regulation accuracy reaches 3%, meeting the test requirements.

Claims

1. An air supply system for high-altitude environmental simulation tests, characterized in that: It includes a high-pressure gas storage system, a high-pressure delivery system and a pressure regulating module; The high-pressure gas storage system is used to provide high-pressure air; the high-pressure delivery system is connected to the high-pressure gas storage system and is used to deliver the required air to the pressure regulating module; The pressure regulating module includes a heater air supply pressure regulating unit and a mixer air supply pressure regulating unit; The heater air supply pressure regulating unit includes a first pressure regulating component, a second pressure regulating component and a first orifice plate connected in parallel. The first pressure regulating component includes a third electric valve and a first pressure regulating valve connected thereto. The third electric valve is connected to the high-pressure delivery system, and the first pressure regulating valve is connected to the heater. A pressure gauge and a thermometer are arranged between the first pressure regulating valve and the heater; the second pressure regulating component includes a fourth electric valve and a second pressure regulating valve connected thereto. The fourth electric valve is connected to the high-pressure delivery system, and the second pressure regulating valve is connected to the heater. A pressure gauge and a thermometer are arranged between the second pressure regulating valve and the heater; a first isolation valve is arranged between the first pressure regulating valve and the heater; the first orifice plate is arranged at the heater inlet and is used to pass the air output from the first pressure regulating valve and the second pressure regulating valve; The mixer air supply pressure regulating unit includes a first regulator, a second regulator, a third pressure regulating component, a fourth pressure regulating component connected in parallel and a second orifice plate arranged at the mixer inlet; The third pressure regulating component includes a sixth electric valve and a third pressure regulating valve connected thereto. The sixth electric valve is connected to the high-pressure delivery system, and the third pressure regulating valve is connected to the mixer; the fourth pressure regulating component includes a fifth electric valve, a first pressure reducer, a second pressure reducer and a second isolation valve. The fifth electric valve is connected to the fourth electric valve. The input ends of the first pressure reducer and the second pressure reducer are both connected to the output end of the fifth electric valve, and the output ends are both connected to the second isolation valve. The second isolation valve is connected to the mixer. The input end of the fifth electric valve is connected between the fourth electric valve and the second pressure regulating valve; the driving end and the input end of the first regulator are both connected to the high-pressure delivery system, and the output end is connected to the driving end of the first pressure reducer; the driving end and the input end of the second regulator are both connected to the high-pressure delivery system, and the output end is connected to the driving end of the second pressure reducer; the second orifice plate is used to pass the air output from the third pressure regulating component and the fourth pressure regulating component; The first pressure regulating valve, the second pressure regulating valve and the third pressure regulating valve are all connected to a pressure regulating valve control system; the first regulator and the second regulator are both connected to a regulator control system.

2. The air supply system for high-altitude environment simulation test according to claim 1, characterized in that: The Cv value of the flow-through of the second pressure regulating valve is greater than the Cv value of the flow-through of the first pressure regulating valve; The Cv value of the flow-through of the third pressure regulating valve is greater than the Cv values of the flow-through of the first pressure reducer and the second pressure reducer.

3. The air supply system for high-altitude environment simulation test according to claim 1 or 2, characterized in that: The high-pressure delivery system includes a first electric valve, a filter, a second electric valve, a manual pressure reducer and a second manual valve; One end of the first electric valve is connected to the high-pressure gas storage system, and the other end is connected to the filter. The filter is connected to the third electric valve, the fourth electric valve and the sixth electric valve; One end of the second electric valve is connected to the high-pressure gas storage system, and the other end is connected to the input ends of the first regulator and the second regulator; One end of the manual pressure reducer is connected to the high-pressure gas storage system, and the other end is connected to the second manual valve. The second manual valve is connected to the driving ends of the first regulator and the second regulator.

4. The air supply system for high-altitude environment simulation test according to claim 3, wherein: The high-pressure gas storage system includes a high-pressure gas storage tank group and a first manual valve connected to the high-pressure gas storage tank group. The first manual valve is respectively connected to the first electric valve, the second electric valve and the manual pressure reducer.

5. The air supply system for high-altitude environment simulation test according to claim 4, wherein: The pressure regulating valve control system adopts a PID algorithm to adjust the opening degrees of the first pressure regulating valve, the second pressure regulating valve and the third pressure regulating valve in real time; the regulator control system adopts a PID algorithm to adjust the control gas of the first regulator and the second regulator in real time.

6. A regulating method for an air supply system used in high-altitude environment simulation tests, characterized in that, Using the air supply system for high-altitude environment simulation test according to claim 1, comprising the following steps: S1. Determine a plurality of heater target pressures and a plurality of mixer target pressures according to the required air pressure ranges of the heaters and the mixer; and determine the corresponding initial debugging apertures of the first orifice plates according to the respective heater target pressures, and determine the corresponding initial debugging apertures of the second orifice plates according to the respective mixer target pressures; S2. Start the pressure regulating valve control system and the regulator control system, and open the high-pressure gas storage system and the high-pressure delivery system; S3. Select the current heater target pressure and the current mixer target pressure; S4. Open the first pressure regulating component and the second pressure regulating component. According to the current heater target pressure, adjust the output pressures of the first pressure regulating valve and the second pressure regulating valve through the pressure regulating valve control system to obtain the opening degrees of the first pressure regulating valve and the second pressure regulating valve when the output pressures of the first pressure regulating valve and the second pressure regulating valve are the current heater target pressure; according to the measurement results of the pressure gauge and the thermometer, obtain the actual aperture of the corresponding first orifice plate under the current heater target pressure; Open the first regulator, the second regulator, the third pressure regulating component and the fourth pressure regulating component. According to the current mixer target pressure, adjust the output pressures of the third pressure regulating valve, the first pressure reducer and the second pressure reducer through the pressure regulating valve control system and the regulator control system to obtain the opening degrees of the third pressure regulating valve, the first pressure reducer and the second pressure reducer respectively corresponding when the output pressures of the third pressure regulating valve, the first pressure reducer and the second pressure reducer are the current mixer target pressure; according to the measurement results of the pressure gauge and the thermometer, obtain the actual aperture of the corresponding second orifice plate under the current mixer target pressure; S5. Return to step S3, re-select the current heater target pressure and the current mixer target pressure until the opening degrees of the first pressure regulating valve and the second pressure regulating valve under each group of heater target pressures are obtained, construct a first relationship curve between the opening degree of the first pressure regulating valve and the corresponding output pressure, a second relationship curve between the opening degree of the second pressure regulating valve and the corresponding output pressure, and determine the relationship formula between the actual aperture of the first orifice plate and the flow rate and pressure; Obtain the opening degrees of the third pressure regulating valve, the first pressure reducer, and the second pressure reducer under the target pressure of each mixer, construct the third relationship curve between the opening degree of the third pressure regulating valve and the corresponding output pressure, the fourth relationship curve between the opening degree of the first pressure reducer and the corresponding output pressure, and the fifth relationship curve between the second pressure reducer and the corresponding output pressure, and determine the relational expression between the actual aperture of the second orifice plate and the flow rate and pressure; Close the pressure regulating valve control system, the regulator control system, the high-pressure gas storage system, the high-pressure transmission system, and the pressure regulating module; S6. Start the high-altitude environment simulation test, and turn on the pressure regulating valve control system, the regulator control system, and the pressure regulating module; S7. Based on the actual air pressure demand of the current heater in the high-altitude environment simulation test, obtain the preset opening degrees of the first pressure regulating valve and the second pressure regulating valve according to the first relationship curve and the second relationship curve in step S5, and set the first pressure regulating valve and the second pressure regulating valve according to the preset opening degrees; determine the actual aperture of the corresponding first orifice plate according to the relational expression between the actual aperture of the first orifice plate and the flow rate and pressure; Based on the actual air pressure demand of the current mixer, obtain the preset opening degrees of the third pressure regulating valve, the first pressure reducer, and the second pressure reducer according to the third relationship curve, the fourth relationship curve, and the fifth relationship curve in step S5, and set the third pressure regulating valve, the first pressure reducer, and the second pressure reducer according to the preset opening degrees; determine the actual aperture of the corresponding second orifice plate according to the relational expression between the actual aperture of the second orifice plate and the flow rate and pressure; S8. Open the high-pressure gas storage system and the high-pressure transmission system, and input air into the heater. If the input pressure of the heater does not meet the requirements, adjust the input pressure of the heater by adjusting the first regulating valve or the second regulating valve; At the same time, input air into the mixer. If the input pressure of the mixer does not meet the requirements, adjust the input pressure of the mixer by adjusting the third regulating valve, the first pressure reducer, or the second pressure reducer; S9. Return to step S7, re-determine the actual air pressure demands of the heater and the mixer according to the high-altitude environment simulation test parameter requirements, and obtain the actual air pressure demands of the current heater and mixer again until the high-altitude environment simulation test ends.

7. The adjustment method of the air supply system for high-altitude environment simulation test according to claim 6, characterized in that: In step S8, if the input pressure of the heater does not meet the requirements, adjusting the input pressure of the heater by adjusting the first regulating valve or the second regulating valve specifically includes: Calculate the actual flow rate of the air input into the heater according to the pressure corresponding to the preset opening degree, the air density under this pressure, and the aperture of the first orifice plate, and adjust the input air pressure of the heater according to the difference ΔQ1 between the actual flow rate and the target heater flow rate; If the opening degree adjustment range of the first regulating valve corresponding to ΔQ1 is within the optimized opening degree range of the first regulating valve, then use the first regulating valve to adjust the input pressure of the heater until the input air pressure meets the requirements of the heater; If the opening degree adjustment range of the first regulating valve corresponding to ΔQ1 is outside the optimized opening degree range of the first regulating valve, then use the second regulating valve to adjust the input pressure of the heater until the input air pressure meets the requirements of the heater.

8. The adjustment method of the air supply system for high-altitude environment simulation test according to claim 7, characterized in that: In step S8, if the input pressure of the mixer does not meet the requirements, the input pressure of the mixer is adjusted by adjusting the third regulating valve or the first pressure reducer or the second pressure reducer. Specifically: Calculate the actual flow rate of the air input into the mixer according to the pressure corresponding to the preset opening, the air density at this pressure, and the aperture of the second orifice plate. Adjust the input air pressure of the mixer according to the difference ΔQ2 between the actual flow rate and the target mixer flow rate; If the opening adjustment range of the first pressure reducer or the second pressure reducer corresponding to ΔQ2 is within the optimized opening range of the first pressure reducer or the second pressure reducer, the first pressure reducer or the second pressure reducer is used to adjust the input pressure of the heater until the air pressure meets the requirements of the mixer; If the opening adjustment range of the first pressure reducer or the second pressure reducer corresponding to ΔQ2 is outside the optimized opening range of the first pressure reducer or the second pressure reducer, the first pressure reducer and the second pressure reducer are simultaneously used to adjust the flow rate of the heater until the air pressure meets the requirements of the mixer; If the opening adjustment ranges of the first pressure reducer and the second pressure reducer corresponding to ΔQ2 are both outside the optimized opening ranges of the first pressure reducer and the second pressure reducer, the third pressure regulating valve is used to adjust the flow rate of the heater until the air pressure meets the requirements of the mixer.

9. The adjustment method of the air supply system for high-altitude environment simulation test according to claim 8, characterized in that: In step S7, the optimized opening ranges of the first regulating valve, the first pressure reducer, and the second pressure reducer are 10%-85% of the corresponding maximum opening.

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