Active injection verification system and verification method for high-altitude simulation test bench

Abstract

The invention relates to an attitude and orbit control engine high-altitude environment simulation ignition test system and a verification method, in particular to a high-altitude simulation test bed active injection verification system and a verification method, and solves the technical problems of high cost, high risk and low verification data validity during verification of a high-altitude simulation test bed in the prior art. The active injection verification system for the high-altitude simulation test bench comprises a vacuum chamber, a diffuser, a water spray cooler, a first corrugated pipe, a first gas collection chamber, a second corrugated pipe, n groups of coolers, a third corrugated pipe, a second gas collection chamber, a steam-jet pump, a pipeline and a data acquisition module, according to the verification method of the active ejection verification system of the high-altitude simulation test stand, ejection capacity verification is carried out in two stages, and the verification effectiveness is greatly improved on the premise that the verification cost is greatly reduced.

Description

Technical Field

[0001] The present invention relates to a high-altitude environment simulation ignition test system and verification method for an attitude and orbit control engine, and in particular to an active ejection verification system and verification method for a high-altitude simulation test bench. Background Art

[0002] During the development phase, attitude control and orbit control engines of launch vehicles, aircraft, spacecraft and other spacecraft must undergo high-altitude environment simulation tests on the test bench to assess the thrust, specific impulse, temperature distribution and other characteristics of the attitude control and orbit control engines in a vacuum environment.

[0003] The existing vacuum suction methods of high-altitude simulation test benches include mechanical vacuum pump group suction, air injection, steam jet pump injection, engine self-injection, etc. Among them, engines with thrust levels of 50N to 20,000N and high vacuum requirements mostly use steam jet pump injection to ensure the vacuum degree of the engine environment.

[0004] After the high-altitude simulation test bench is built and before the engine enters the cabin for ignition test, it is necessary to verify the ejection capability of the high-altitude simulation test bench and its vacuum maintenance capability under load conditions. If a real engine is used to evaluate and verify the test bench capability, the cost is high and the risk is high. However, by leaking air at the inlet of the jet pump, it is impossible to verify the pressure drop, pressure loss, load distribution uniformity and other parameters of the simulated vacuum cabin, diffuser, and cooler channel, resulting in low validity of the verification data. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problems of high cost, high risk and low validity of verification data in the prior art when verifying a high-altitude simulation test bench, and to provide a high-altitude simulation test bench active ejection verification system and verification method.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] An active ejection verification system for a high-altitude simulation test bench is special in that it includes a vacuum cabin, a diffuser, a water spray cooler, a first bellows, a first gas collecting chamber, a second bellows, a cooler, a third bellows, a second gas collecting chamber, a steam jet pump, and a data acquisition module, which are sequentially connected along the gas flow direction; the value of n is greater than or equal to 3, and the value of m is greater than or equal to 1; wherein, the number of the second bellows, the cooler, and the third bellows is n, and the n second bellows, the cooler, and the third bellows are connected between the first gas collecting chamber and the third bellows in a one-to-one correspondence;

[0008] The vacuum chamber is used to be connected to the vacuum chamber load generating device through the vacuum chamber load discharge valve and connected to the vacuum unit through the vacuum unit isolation valve;

[0009] A vacuum isolation valve is provided on the pipeline between the outlet of the second gas collecting chamber and the inlet of the steam jet pump;

[0010] The steam jet pump is used to be connected to the jet pump load generating device through the jet pump load discharge valve;

[0011] The vacuum chamber, diffuser, water spray cooler, cooler, and steam jet pump are all provided with a vacuum transmitter and a temperature sensor connected to the data acquisition module; the vacuum chamber load generating device and the jet pump load generating device are both provided with a regulating valve and a flow meter connected to the data acquisition module;

[0012] The diffuser is used to increase the pressure and reduce the speed of the engine fuel gas; the water spray cooler is used to spray liquid water to reduce the temperature and speed of the engine fuel gas, and directly mix it with the water to obtain a mixed gas; the cooler is used to enhance the cooling effect of the engine fuel gas; the first air collecting chamber and the second air collecting chamber are both used to diffuse the mixed gas and further reduce the temperature and speed of the mixed gas; the first bellows is used to compensate for the thermal deformation of the diffuser, the water spray cooler and the first air collecting chamber and absorb their thermal stress; the second bellows is used to compensate for the thermal deformation of the first air collecting chamber and the cooler and absorb their thermal stress; the third bellows is used to compensate for the thermal deformation of the second air collecting chamber and the cooler; the vacuum cabin load generating device and the jet pump load generating device are used to simulate the load of the engine launch; the data acquisition module is used to collect vacuum degree, temperature, flow rate and vacuum pressure; the steam jet pump is used to verify the active ejection capability of the engine high-altitude simulation test bench.

[0013] Furthermore, it also includes a blender respectively arranged in the jet pump load generating device and the vacuum chamber load generating device; the blender includes a first channel and a second channel;

[0014] The jet pump load generating device comprises a load gas channel, an air compressor and a water vapor generator; the air compressor outlet is connected to the first channel through an air compressor connecting flange; the water vapor generator outlet is connected to the second channel through a water vapor generator connecting flange; the outlet ends of the first channel and the second channel are connected to the blender outlet docking flange of the load gas channel through a blender outlet flange, and the outlet of the load gas channel is connected to the steam jet pump through a jet pump load discharge valve;

[0015] A first flow regulating valve and a first flow meter are provided on the connecting pipeline between the air compressor and the first channel; a compressed air injection pipe is provided at the air outlet of the first channel, and the compressed air injection pipe is used to inject compressed air into the load gas channel of the jet pump load generating device;

[0016] A second flow regulating valve and a second flow meter are arranged on the steam inlet connecting pipeline between the water vapor generator and the second channel; a superheated steam injection pipe is arranged at the gas outlet of the second channel, and the superheated steam injection pipe is used to inject superheated steam into the load gas channel of the jet pump load generating device;

[0017] The vacuum chamber load generating device has the same structure as the jet pump load generating device; the air compressor outlet of the vacuum chamber load generating device is connected to the first channel via an air compressor connecting flange; the water vapor generator outlet of the vacuum chamber load generating device is connected to the second channel via a water vapor generator connecting flange; the outlet ends of the first channel and the second channel are connected to the blender outlet docking flange of the load gas channel of the vacuum chamber load generating device via a blender outlet flange, and the outlet of the load gas channel of the vacuum chamber load generating device is connected to the vacuum chamber via a vacuum chamber load discharge valve;

[0018] A third flow regulating valve and a third flow meter are arranged on the pipeline connecting the air compressor of the vacuum cabin load generating device and the first channel; a compressed air injection pipe is arranged at the air outlet of the first channel, and the compressed air injection pipe is used to inject compressed air into the load gas channel of the vacuum cabin load generating device;

[0019] A fourth flow regulating valve and a fourth flow meter are provided on the connecting pipeline between the water vapor generator of the vacuum chamber load generating device and the second channel; a superheated steam injection pipe is provided at the gas outlet of the second channel, and the superheated steam injection pipe is used to inject superheated water vapor into the load gas channel of the vacuum chamber load generating device;

[0020] All flow regulating valves and flow meters are connected to the data acquisition module.

[0021] Furthermore, a heat sink system is provided on the vacuum chamber to absorb the heat released by the engine ignition; and the steam jet pumps are m groups.

[0022] Furthermore, the water spray cooler is provided with a plurality of water spray rod assemblies, one end of the water spray rod assembly is connected to an external water source, and the other end is arranged in the water spray cooler for spraying liquid water to the gas.

[0023] Furthermore, water sprays are respectively provided on the outer walls of the first bellows and the second bellows to prevent the first bellows and the second bellows from overheating.

[0024] Furthermore, both ends of the first plenum chamber and both ends of the second plenum chamber are provided with seal heads.

[0025] Furthermore, n=3, m=3.

[0026] Furthermore, the diffuser is a sandwich water-cooled structure, and adopts a secondary throat diffuser or a straight-cylinder diffuser.

[0027] Furthermore, the first plenum chamber and the second plenum chamber are both columnar structures;

[0028] The cooler is a shell and tube structure or a tube bundle structure.

[0029] At the same time, the present invention also provides a high-altitude simulation test bench active ejection verification method, based on the above-mentioned high-altitude simulation test bench active ejection verification system verification method, which is special in that it includes the following steps:

[0030] 1) Start the data acquisition module and monitor the vacuum degree, vacuum pressure, temperature and flow in real time;

[0031] 2) Seal the vacuum chamber and evacuate the cavity between the vacuum chamber and the vacuum isolation valve;

[0032] 3) Start the steam jet pump and evacuate the steam jet pump until the change value of its vacuum pressure is within ±5% and the stable duration is greater than or equal to 20 seconds, then start the jet pump load generating device according to the first predetermined load flow rate, and open the jet pump load relief valve at the same time, and close the jet pump load relief valve and the jet pump load generating device after the vacuum pressure and temperature of the steam jet pump are stable for greater than or equal to 20 seconds;

[0033] 4) According to the working flow rate of 110%, start the jet pump load generating device, and open the jet pump load relief valve at the same time; determine whether the vacuum pressure and temperature stabilization time of the steam jet pump is greater than or equal to 20s, and the vacuum pressure of the steam jet pump is less than the vacuum pressure of the cavity between the vacuum chamber and the vacuum isolation valve. If so, the steam jet pump meets the design indicators, close the jet pump load relief valve and the jet pump load generating device, and open the vacuum isolation valve at the same time, and execute step 5); otherwise, adjust the first predetermined load flow and return to step 3);

[0034] 5) The cavity between the vacuum chamber and the steam jet pump is evacuated by a steam jet pump until the change value of the vacuum pressure is within ±5% and the stable duration is greater than or equal to 20 seconds; the vacuum chamber load generating device is started according to the second predetermined load flow rate, and the vacuum chamber load relief valve is opened at the same time, and after the vacuum pressure of the cavity between the vacuum chamber and the steam jet pump is stabilized for a time greater than or equal to 20 seconds, the vacuum chamber load relief valve and the vacuum chamber load generating device are closed;

[0035] 6) According to the working flow rate of 110%, the vacuum chamber load generating device is started, and the vacuum chamber load relief valve is opened at the same time, and it is determined whether the change value of the cavity vacuum pressure between the vacuum chamber and the steam jet pump is within ±5%, and the stable duration is greater than or equal to 20s. If so, the vacuum pressure and temperature distribution of the diffuser, the water spray cooler, the first air collecting chamber, the cooler, the second air collecting chamber, and the steam jet pump meet the design indicators, and the vacuum chamber load relief valve and the vacuum chamber load generating device are closed; otherwise, the second predetermined load flow rate is adjusted and the process returns to step 5);

[0036] 7) Close the vacuum isolation valve, steam jet pump and data acquisition module, and stop collecting data.

[0037] Beneficial effects of the present invention:

[0038] 1. The active ejection verification system of the high-altitude simulation test bench of the present invention, the designed jet pump load generating device and vacuum chamber load generating device can accurately simulate the engine gas composition, the temperature after the gas and spray water are mixed, and the total flow rate of the mixture, which greatly improves the accuracy of the verification.

[0039] 2. The verification method of the active ejection verification system of a high-altitude simulation test bench of the present invention is divided into two stages to carry out the ejection capability verification. The first stage is to discharge the load through the jet pump load generating device at the inlet of the steam jet pump, mainly to verify whether the performance of the steam jet pump newly built or intended to be used in a changed working condition meets the design or expected requirements. If the steam jet pump cannot meet the design or expected requirements, the second stage verification will not be carried out. In the second stage, the load is discharged through the vacuum cabin load generating device at the tail of the vacuum cabin, which can verify the flow resistance loss of the diffuser, water spray cooler, and cooler under the specified load flow, the temperature gradient, and the uniformity of the flow distribution of n groups of coolers. This phased verification method greatly improves the verification effectiveness while greatly reducing the verification cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of an embodiment of an active ejection verification system of a high-altitude simulation test bench of the present invention;

[0041] Figure 2 yes Figure 1 A top view of

[0042] Figure 3 It is a structural schematic diagram of a jet pump load generating device in an embodiment of an active ejection verification system of a high-altitude simulation test bench of the present invention;

[0043] Figure 4 It is a schematic diagram of the structure of a mixer in an embodiment of an active ejection verification system of a high-altitude simulation test bench of the present invention.

[0044] Explanation of reference numerals: 1-vacuum chamber, 2-vacuum unit, 21-vacuum unit isolation valve, 3-vacuum chamber load relief valve, 31-vacuum chamber load generating device, 4-diffuser, 5-water spray cooler, 6-first bellows, 7-first air collecting chamber, 8-second bellows, 9-cooler, 10-third bellows, 11-second air collecting chamber, 12-vacuum isolation valve, 13-steam jet pump, 14-jet pump load relief valve, 15-jet pump load generating device, 151-vacuum Air compressor, 152-steam generator, 153-first flow regulating valve, 154-second flow regulating valve, 155-first flow meter, 156-second flow meter, 16-mixer, 81-air compressor connecting flange, 82-first channel, 83-steam generator connecting flange, 84-second channel, 85-mixer outlet docking flange, 86-load gas channel, 87-compressed air injection pipe, 88-superheated steam injection pipe, 89-mixer outlet flange. DETAILED DESCRIPTION

[0045] like Figure 1 and Figure 2 As shown, an active ejection verification system of a high-altitude simulation test bench includes a vacuum cabin 1, a diffuser 4, a water spray cooler 5, a first bellows 6, a first gas collecting chamber 7, a second bellows 8, a cooler 9, a third bellows 10, a second gas collecting chamber 11, a steam jet pump 13, and a vacuum cabin load relief valve 3, a jet pump load relief valve 14, and a data acquisition module connected in sequence along the gas flow direction; in this embodiment, the value of n is 3, and the value of m is 3. Among them, there are three second bellows 8, coolers 9, and third bellows 10, and the three second bellows 8, coolers 9, and third bellows 10 are connected between the first gas collecting chamber 7 and the third bellows 10 in a one-to-one correspondence.

[0046] The vacuum cabin 1 is used to be connected to the vacuum cabin load generating device 31 through the vacuum cabin load relief valve 3 and to the vacuum unit 2 through the vacuum unit isolation valve 21, and the vacuum unit 2 is used to evacuate the vacuum cabin 1; a vacuum isolation valve 12 is provided on the pipeline between the outlet of the second gas collecting chamber and the inlet of the steam jet pump 13; the steam jet pump 13 is used to be connected to the jet pump load generating device 15 through the jet pump load relief valve 14; the vacuum cabin 1, the diffuser 4, the water spray cooler 5, the cooler 9, and the steam jet pump 13 are all provided with a vacuum transmitter and a temperature sensor connected to the data acquisition module; the vacuum cabin load generating device 31 and the jet pump load generating device 15 are both provided with a flow meter connected to the data acquisition module.

[0047] The diffuser 4 is used to increase the pressure and reduce the speed of the engine fuel gas; the water spray cooler 5 is used to spray liquid water to reduce the temperature and speed of the engine fuel gas, and directly mix it with the fuel gas to obtain a mixed gas; the cooler 9 is used to enhance the cooling effect of the engine fuel gas; the first gas collecting chamber 7 and the second gas collecting chamber 11 are both used to diffuse the mixed gas and further reduce the temperature and speed of the mixed gas; the first bellows 6 is used to compensate for the thermal deformation of the diffuser 4, the water spray cooler 5 and the first gas collecting chamber 7 and absorb their thermal stress; the second bellows 8 is used to compensate for the thermal deformation of the first gas collecting chamber 7 and the cooler 9 and absorb their thermal stress; the third bellows 10 is used to compensate for the thermal deformation of the second gas collecting chamber 11 and the cooler 9; the vacuum cabin load generating device 31 and the jet pump load generating device 15 are used to simulate the load of the engine launch; the data acquisition module is used to collect vacuum degree, temperature, flow rate and vacuum pressure; the steam jet pump 13 is used to verify the active ejection capability of the engine high-altitude simulation test bench, and it adopts an active ejection method to achieve the generation and maintenance of the vacuum degree of the high-altitude simulation test bench.

[0048] The vacuum cabin 1 is a place for engine installation and ignition. It is provided with an openable cabin door for personnel and equipment to enter and exit. A heat sink system is provided on the vacuum cabin 1 to absorb the heat released by the engine ignition. The diffuser 4 is a sandwich water-cooled structure. A secondary throat diffuser or a straight-cylinder diffuser is used to achieve the pressure increase and speed reduction of the engine gas. The profile of the diffuser 4 is determined by calculation. A plurality of water spray rod assemblies are provided on the water spray cooler 5. One end of the water spray rod assembly is connected to an external water source, and the other end is provided in the water spray cooler 5, which is used to spray liquid water to the gas. The liquid water discharged is directly mixed with the engine gas to reduce the gas temperature and further reduce the gas speed. The spraying water volume of the water spray rod assembly is reasonably designed to ensure that the gas temperature at the outlet of the water spray cooler 5 does not exceed 1000°C; the first bellows 6 is arranged at the rear end of the water spray cooler 5 to compensate for the thermal deformation of the diffuser 4, the water spray cooler 5 and the first gas collecting chamber 7 and absorb their thermal stress. A water spray is arranged on the outer wall of the first bellows 6 to prevent the first bellows 6 from overheating; the first gas collecting chamber 7 is a columnar structure, and a head is arranged at both ends thereof. The gas at the outlet of the first bellows 6 diffuses after entering the first gas collecting chamber 7, so that the gas velocity and gas temperature are further reduced. The first gas collecting chamber 7 is a sandwich water-cooled structure; the second bellows 8 is arranged between the first gas collecting chamber 7 and the cooler 9, which is used to compensate for the thermal deformation of the first gas collecting chamber 7 and the cooler 9 and absorb their thermal stress. A water spray is arranged on the outer wall of the second bellows 8 to prevent the second bellows 8 from overheating; the cooler 9 is the main cooling place for the engine gas, and adopts a shell and tube type or a tube bundle type structure to ensure that its outlet temperature does not exceed 300°C. According to the design requirements, the coolers 9 are usually connected in parallel in n groups to enhance the cooling effect and reduce the flow resistance loss of the cooler 9; the value of n is greater than or equal to 3; the third bellows 10 is arranged between the cooler 9 and the second gas collecting chamber 11, which is used to compensate for the thermal deformation of the second gas collecting chamber 11 and the cooler 9 and absorb their thermal stress. The temperature here is relatively low, and the outer wall water spray may not be arranged; the second gas collecting chamber 11 is a columnar structure, and a head is arranged at both ends. The inlet of the second gas collecting chamber 11 is connected to the third bellows 10, and the outlet is connected to the vacuum isolation valve 12 through a pipeline; the pipeline and the vacuum isolation valve 12 are the channels for the gas to flow to the steam jet pump 13. The steam jet pump 13 uses high-temperature and high-pressure steam flow to obtain its inlet vacuum degree, and usually adopts m groups of parallel structures, and the value of m is greater than or equal to 1.

[0049] During the actual test run, the load of the active ejection verification system of the high-altitude simulation test bench includes the gas generated by the engine and the liquid water sprayed by the water spray cooler 5. The vacuum chamber load generating device 31 and the jet pump load generating device 15 are used to simulate the loads generated by the two on the ejection system, including load component simulation, load temperature simulation and load flow simulation. The vacuum chamber load generating device 31 and the jet pump load generating device 15 output a gas load of a specified flow rate and specified composition through a mixture of air and water vapor. According to the engine gas flow rate and molar mass and the liquid water flow rate, the gas load flow rate required for the ejection system verification is obtained.

[0050] For example, when it is known that the engine gas flow rate is 20kg / s, of which the non-condensable components account for 80% and the condensable components account for 20%. The liquid water flow rate injected during the test run is 15kg / s, and the injection system load includes 16kg / s of non-condensable gas + 19kg / s of condensable gas. Therefore, the load generation system needs to output 16kg / s of non-condensable gas flow + 19kg / s of condensable gas flow. Among them, condensable gas generally refers to water vapor, and condensable gas will be condensed to form liquid water during the circulation process of the steam injection pump 13.

[0051] like Figure 3 and Figure 4 As shown, a mixer 16 is provided in the jet pump load generating device 15 and the vacuum chamber load generating device 31, respectively, and the mixer 16 is used to fully mix the compressed air with the superheated water vapor. The mixer 16 includes a first channel 82 and a second channel 84. The jet pump load generating device 15 includes a load gas channel 86, an air compressor 151 and a water vapor generator 152; the air compressor 151 is used to compress and dry the normal pressure air, and the speed of the air compressor 151 is adjustable, so as to adjust the pressure and air flow at the outlet of the air compressor 151; the water vapor generator 152 generates superheated steam by electric heating, gas heating, and oil heating, and its steam temperature and steam flow are adjustable.

[0052] The outlet of the air compressor 151 is connected to the first channel 82 through the air compressor connecting flange 81; the outlet of the steam generator 152 is connected to the second channel 84 through the steam generator connecting flange 83; the outlet ends of the first channel 82 and the second channel 84 are connected to the mixer outlet docking flange 85 of the load gas channel 86 through the mixer outlet flange 89, and the outlet of the load gas channel 86 is connected to the steam jet pump 13 through the jet pump load discharge valve 14.

[0053] A first flow regulating valve 153 and a first flow meter 155 are provided on the connecting pipeline between the air compressor 151 and the first channel 82; a compressed air injection pipe 87 is provided at the air outlet of the first channel 82, and the compressed air injection pipe 87 is used to inject compressed air to the load gas channel 86 of the jet pump load generating device 15. A second flow regulating valve 154 and a second flow meter 156 are provided on the connecting pipeline between the water vapor generator 152 and the second channel 84; a superheated steam injection pipe 88 is provided at the air outlet of the second channel 84, and the superheated steam injection pipe 88 is used to inject superheated water vapor to the load gas channel 86 of the jet pump load generating device 15.

[0054] The vacuum chamber load generating device 31 has the same structure as the jet pump load generating device 15; the outlet of the air compressor 151 of the vacuum chamber load generating device 31 is connected to the first channel 82 via the air compressor connecting flange 81; the outlet of the water vapor generator 152 of the vacuum chamber load generating device 31 is connected to the second channel 84 via the water vapor generator connecting flange 83; the outlet ends of the first channel 82 and the second channel 84 are connected to the mixer outlet docking flange 85 of the load gas channel 86 of the vacuum chamber load generating device 31 via the mixer outlet flange 89, and the outlet of the load gas channel 86 is connected to the vacuum chamber 1 via the vacuum chamber load discharge valve 3.

[0055] A third flow regulating valve and a third flow meter are provided on the connecting pipeline between the air compressor 151 of the vacuum chamber load generating device 31 and the first channel 82; a compressed air injection pipe 87 is provided at the air outlet of the first channel 82, and the compressed air injection pipe 87 is used to inject compressed air to the load gas channel 86 of the vacuum chamber load generating device 31. A fourth flow regulating valve and a fourth flow meter are provided on the connecting pipeline between the water vapor generator 152 of the vacuum chamber load generating device 31 and the second channel 84; a superheated steam injection pipe 88 is provided at the air outlet of the second channel 84, and the superheated steam injection pipe 88 is used to inject superheated water vapor to the load gas channel 86 of the vacuum chamber load generating device 31.

[0056] The first flow regulating valve 153, the first flow meter 155, the second flow regulating valve 154, the second flow meter 156, the third flow regulating valve, the third flow meter, the fourth flow regulating valve, and the fourth flow meter are all connected to the data acquisition module. The first flow regulating valve 153, the second flow regulating valve 154, the third flow regulating valve, and the fourth flow regulating valve are all used to adjust the compressed air and superheated water vapor, and they are all remote control valves; the first flow meter 155, the second flow meter 156, the third flow meter, and the fourth flow meter are all used to measure the real-time flow of compressed air and water vapor.

[0057] The jet pump load generating device 15 and the vacuum chamber load generating device 31 can adjust the load composition, load flow and load temperature in real time as needed. When adjusting the load composition, the ratio of compressed air and superheated water vapor is adjusted by adjusting the opening ratio of the first flow regulating valve 153 and the second flow regulating valve 154, and the third flow regulating valve and the fourth flow regulating valve, so as to adjust the proportion of condensable gas and non-condensable gas in the load gas; when adjusting the load flow, the opening of the first flow regulating valve 153 and the second flow regulating valve 154, and the opening of the third flow regulating valve and the fourth flow regulating valve are synchronously adjusted to adjust the load flow as a whole; when adjusting the load temperature, the steam temperature is adjusted while keeping the flow unchanged by setting the superheat of the steam generator 152, so as to adjust the load temperature.

[0058] The verification of the active ejection verification system of the high-altitude simulation test bench of the present invention generally needs to achieve the following verification purposes:

[0059] 1. Verify the ultimate vacuum pressure at the suction port of the steam jet pump 13;

[0060] 2. Verify whether the pressure distribution and temperature distribution of the steam jet pump 13 meet the design indicators when the load of rated working condition is discharged into the inlet of the steam jet pump 13;

[0061] 3. Verify whether the pressure distribution and temperature distribution of the steam jet pump 13 meet the design indicators when the vacuum chamber 1 is discharged into the rated working condition load, whether the flow distribution uniformity of the n groups of coolers 9, the vacuum pressure distribution and temperature distribution of the diffuser 4, the water spray cooler 5, the first air collecting chamber 7, and the second air collecting chamber 11 meet the design indicators.

[0062] For the injection system with multiple steam injection pumps in parallel, multiple injection verifications should be carried out. The parameter names, measurement point locations, and sensor types that need to be measured during the verification process are shown in Table 1 below:

[0063] Table 1

[0064] Parameter name Measuring point location Sensor Type Remark Vacuum chamber pressure Vacuum Chamber Vacuum transmitter Vacuum chamber temperature Vacuum Chamber Temperature Sensor Diffuser inlet pressure Diffuser inlet Vacuum transmitter Diffuser inlet temperature Diffuser inlet Temperature Sensor Diffuser throat pressure Diffuser throat Vacuum transmitter Diffuser throat temperature Diffuser throat Temperature Sensor Diffuser outlet pressure Diffuser outlet Vacuum transmitter Diffuser outlet temperature Diffuser outlet Temperature Sensor Desuperheater inlet pressure Cooler inlet Vacuum transmitter Three, one for each cooler inlet Desuperheater inlet temperature Cooler inlet Temperature Sensor Three, one for each cooler inlet Desuperheater outlet pressure Cooler outlet Vacuum transmitter Three, one for each cooler inlet Cooler outlet temperature Cooler outlet Temperature Sensor Three, one for each cooler inlet Inlet pressure of injection pump Injection pump inlet Vacuum transmitter Three, one for each jet pump inlet Inlet temperature of injection pump Injection pump inlet Temperature Sensor Three, one for each jet pump inlet Air flow Load generating device Flow Meter Steam flow Load generating device Flow Meter Load temperature Load generating device Temperature Sensor

[0065] In this embodiment, a group of pressure sensors are respectively arranged at different positions of the vacuum chamber 1, and each group is provided with pressure sensors with three ranges of high, medium and low. The inlet pressure of the diffuser 4 is provided with pressure sensors with three ranges of high, medium and low.

[0066] The present invention is based on the verification method of the active ejection verification system of the high-altitude simulation test bench, comprising the following steps:

[0067] 1) Start the data acquisition module and monitor the vacuum degree, vacuum pressure, temperature and flow in real time;

[0068] 2) Close the vacuum chamber 1 and evacuate the cavity between the vacuum chamber 1 and the vacuum isolation valve 12; the vacuum degree of the cavity between the vacuum chamber 1 and the vacuum isolation valve 12 is related to the number of stages of the jet pump 13. The vacuum degree should be higher than the ultimate vacuum degree of jet pumps 13 of different levels. The ultimate vacuum degree of the four-stage jet pump is 40-60Pa, so this vacuum degree should be greater than 60Pa. The ultimate vacuum degree of the three-stage jet pump is about 600-800Pa, so this vacuum degree should be higher than 800Pa. The two-stage jet pump, the one-stage jet pump and so on should be greater than the upper limit of the ultimate vacuum degree that can be achieved.

[0069] 3) Start the steam jet pump 13 and evacuate the steam jet pump 13 until the change value of its vacuum pressure is ±5% and the duration is greater than or equal to 20 seconds, then start the jet pump load generating device 15 according to the first predetermined load flow rate, and open the jet pump load relief valve 14 at the same time, and close the jet pump load relief valve 14 and the jet pump load generating device 15 after the vacuum pressure and temperature of the steam jet pump 13 are stabilized for a time greater than or equal to 20 seconds;

[0070] 4) According to the working flow rate of 110%, start the jet pump load generating device 15, and open the jet pump load relief valve 14 at the same time; determine whether the vacuum pressure and temperature stabilization time of the steam jet pump 13 are greater than or equal to 20s, and the vacuum pressure of the steam jet pump 13 is less than the vacuum pressure of the cavity between the vacuum chamber 1 and the vacuum isolation valve 12. If so, the steam jet pump 13 meets the design indicators, close the jet pump load relief valve 14 and the jet pump load generating device 15, and open the vacuum isolation valve 12 at the same time, and execute step 5); otherwise, adjust the first predetermined load flow rate and return to step 3);

[0071] 5) The cavity between the vacuum chamber 1 and the steam jet pump 13 is evacuated by the steam jet pump 13 until the change value of the vacuum pressure is within ±5% and the vacuum pressure is stable for a duration greater than or equal to 20 seconds; the vacuum chamber load generating device 31 is started according to the second predetermined load flow rate, and the vacuum chamber load discharge valve 3 is opened at the same time, and after the vacuum pressure of the cavity between the vacuum chamber 1 and the steam jet pump 13 is stable for a duration greater than or equal to 20 seconds, the vacuum chamber load discharge valve 3 and the vacuum chamber load generating device 31 are closed;

[0072] 6) According to the working flow of 110%, the vacuum chamber load generating device 31 is started, and the vacuum chamber load leakage valve 3 is opened at the same time, and it is determined whether the change value of the cavity vacuum pressure between the vacuum chamber 1 and the steam jet pump 13 is within ±5%, and the vacuum pressure stability duration is greater than or equal to 20s. If so, the vacuum pressure and temperature distribution of the diffuser 4, the water spray cooler 5, the first air collecting chamber 7, the cooler 9, the second air collecting chamber 11, and the steam jet pump 13 meet the design indicators, and the vacuum chamber load leakage valve 3 and the vacuum chamber load generating device 31 are closed; otherwise, the second predetermined load flow is adjusted, and the process returns to step 5);

[0073] 7) Close the vacuum isolation valve 12, the steam jet pump 13 and the data acquisition module, and stop collecting data;

[0074] Table 2

[0075]

[0076] In this embodiment, according to the above operation, the injection system of three groups of steam jet pumps 13 in parallel can be directly verified, wherein the first predetermined load flow rate and the second predetermined load flow rate are controlled according to the above Table 2. Under the first predetermined load flow rate and the second predetermined load flow rate, the vacuum pressure and temperature distribution of the diffuser 4, the water spray cooler 5, the first air collecting chamber 7, the three groups of coolers 9, the second air collecting chamber 11, and the steam jet pump 13 all meet the design indicators.

Claims

1. An active ejection verification system for a high-altitude simulation test bench, characterized in that: The invention comprises a vacuum chamber (1), a diffuser (4), a water spray cooler (5), a first bellows (6), a first gas collecting chamber (7), a second bellows (8), a cooler (9), a third bellows (10), a second gas collecting chamber (11), a steam jet pump (13), and a data acquisition module, which are sequentially connected along the gas flow direction; the value of n is greater than or equal to 3, and the value of m is greater than or equal to 1; wherein the number of the second bellows (8), the cooler (9), and the third bellows (10) is n, and the n second bellows (8), the cooler (9), and the third bellows (10) are connected one-to-one between the first gas collecting chamber (7) and the third bellows (10); The vacuum chamber (1) is used to be connected to a vacuum chamber load generating device (31) via a vacuum chamber load discharge valve (3), and to be connected to a vacuum unit (2) via a vacuum unit isolation valve (21); A vacuum isolation valve (12) is provided on the pipeline between the outlet of the second gas collecting chamber (11) and the inlet of the steam jet pump (13); The steam jet pump (13) is used to be connected to a jet pump load generating device (15) via a jet pump load discharge valve (14); The vacuum chamber (1), the diffuser (4), the water spray cooler (5), the cooler (9), and the steam jet pump (13) are all provided with a vacuum transmitter and a temperature sensor connected to a data acquisition module; the vacuum chamber load generating device (31) and the jet pump load generating device (15) are all provided with a regulating valve and a flow meter connected to the data acquisition module; The diffuser (4) is used to increase the pressure and reduce the speed of the engine fuel gas; the water spray cooler (5) is used to spray liquid water to reduce the temperature and speed of the engine fuel gas and directly mix it with the fuel gas to obtain a mixed gas; the cooler (9) is used to enhance the cooling effect of the engine fuel gas; the first gas collecting chamber (7) and the second gas collecting chamber (11) are both used to diffuse the mixed gas and further reduce the temperature and speed of the mixed gas; the first bellows (6) is used to compensate for the thermal deformation of the diffuser (4), the water spray cooler (5) and the first gas collecting chamber (7) and absorb The second bellows (8) is used to compensate for the thermal deformation of the first air collecting chamber (7) and the cooler (9) and absorb their thermal stress; the third bellows (10) is used to compensate for the thermal deformation of the second air collecting chamber (11) and the cooler (9); the vacuum chamber load generating device (31) and the jet pump load generating device (15) are used to simulate the load of the engine launch; the data acquisition module is used to collect the vacuum degree, temperature, flow rate and vacuum pressure; the steam jet pump (13) is used to verify the active ejection capability of the engine high-altitude simulation test bench.

2. According to claim 1, an active ejection verification system for a high-altitude simulation test bench is characterized by: It also includes a mixer (16) which is respectively arranged in the jet pump load generating device (15) and the vacuum chamber load generating device (31); the mixer (16) includes a first channel (82) and a second channel (84); The jet pump load generating device (15) comprises a load gas channel (86), an air compressor (151) and a water vapor generator (152); the outlet of the air compressor (151) is connected to the first channel (82) through an air compressor connecting flange (81); the outlet of the water vapor generator (152) is connected to the second channel (84) through a water vapor generator connecting flange (83); the outlet ends of the first channel (82) and the second channel (84) are connected to the blender outlet docking flange (85) of the load gas channel (86) through a blender outlet flange (89), and the outlet of the load gas channel (86) is connected to the steam jet pump (13) through a jet pump load discharge valve (14); A first flow regulating valve (153) and a first flow meter (155) are provided on the connecting pipeline between the air compressor (151) and the first channel (82); a compressed air injection pipe (87) is provided at the air outlet of the first channel (82), and the compressed air injection pipe (87) is used to inject compressed air into the load gas channel (86) of the jet pump load generating device (15); A second flow regulating valve (154) and a second flow meter (156) are provided on a pipeline connecting the steam generator (152) and the steam inlet of the second channel (84); a superheated steam injection pipe (88) is provided at the gas outlet of the second channel (84), and the superheated steam injection pipe (88) is used to inject superheated steam into the load gas channel (86) of the jet pump load generating device (15); The vacuum chamber load generating device (31) has the same structure as the jet pump load generating device (15); the outlet of the air compressor (151) of the vacuum chamber load generating device (31) is connected to the first channel (82) via the air compressor connecting flange (81); the outlet of the water vapor generator (152) of the vacuum chamber load generating device (31) is connected to the second channel (84) via the water vapor generator connecting flange (83); the outlet ends of the first channel (82) and the second channel (84) are connected to the blender outlet docking flange (85) of the load gas channel (86) of the vacuum chamber load generating device (31) via the blender outlet flange (89), and the outlet of the load gas channel (86) of the vacuum chamber load generating device (31) is connected to the vacuum chamber (1) via the vacuum chamber load discharge valve (3); A third flow regulating valve and a third flow meter are provided on a pipeline connecting the air compressor (151) of the vacuum chamber load generating device (31) and the first channel (82); a compressed air injection pipe (87) is provided at the air outlet of the first channel (82), and the compressed air injection pipe (87) is used to inject compressed air into the load gas channel (86) of the vacuum chamber load generating device (31); A fourth flow regulating valve and a fourth flow meter are provided on a connecting pipeline between the water vapor generator (152) of the vacuum chamber load generating device (31) and the second channel (84); a superheated steam injection pipe (88) is provided at the gas outlet of the second channel (84), and the superheated steam injection pipe (88) is used to inject superheated steam into the load gas channel (86) of the vacuum chamber load generating device (31); All flow regulating valves and flow meters are connected to the data acquisition module.

3. According to claim 2, an active ejection verification system for a high-altitude simulation test bench is characterized in that: The vacuum chamber (1) is provided with a heat sink system for absorbing the heat released by the engine ignition; The steam jet pumps (13) are in m groups.

4. According to claim 3, an active ejection verification system for a high-altitude simulation test bench is characterized in that: The water spray cooler (5) is provided with a plurality of water spray rod assemblies, one end of which is connected to an external water source and the other end of which is arranged inside the water spray cooler (5) for spraying liquid water onto the fuel gas.

5. According to claim 4, an active ejection verification system for a high-altitude simulation test bench is characterized in that: Water sprays are provided on the outer wall of the first bellows (6) and the outer wall of the second bellows (8), respectively, to prevent the first bellows (6) and the second bellows (8) from overheating.

6. According to claim 5, an active ejection verification system for a high-altitude simulation test bench is characterized by: Both ends of the first air collecting chamber (7) and both ends of the second air collecting chamber (11) are provided with sealing heads.

7. According to claim 6, an active ejection verification system for a high-altitude simulation test bench is characterized by: Said n=3, m=3.

8. According to claim 7, an active ejection verification system for a high-altitude simulation test bench is characterized by: The diffuser (4) is a sandwich water-cooled structure, and adopts a secondary throat diffuser or a straight-cylinder diffuser.

9. According to claim 8, an active ejection verification system for a high-altitude simulation test bench is characterized by: The first gas collecting chamber (7) and the second gas collecting chamber (11) are both columnar structures; The cooler (9) is a shell and tube structure or a tube bundle structure.

10. A method for verifying active ejection of a high-altitude simulation test bench, based on the active ejection verification system of a high-altitude simulation test bench according to any one of claims 1 to 9, characterized in that: The following steps are involved: 1) Start the data acquisition module and monitor the vacuum degree, vacuum pressure, temperature and flow in real time; 2) sealing the vacuum chamber (1) and evacuating the cavity between the vacuum chamber (1) and the vacuum isolation valve (12); 3) starting the steam jet pump (13) and evacuating the steam jet pump (13) until the change value of the vacuum pressure is within ±5% and the stabilization duration is greater than or equal to 20 seconds, starting the jet pump load generating device (15) according to the first predetermined load flow rate, and opening the jet pump load relief valve (14) at the same time; after the vacuum pressure and temperature of the steam jet pump (13) are stabilized for a time greater than or equal to 20 seconds, closing the jet pump load relief valve (14) and the jet pump load generating device (15); 4) According to the working flow rate of 110%, the jet pump load generating device (15) is started, and the jet pump load relief valve (14) is opened at the same time; after judging whether the vacuum pressure and temperature stabilization time of the steam jet pump (13) are greater than or equal to 20 seconds, and the vacuum pressure of the steam jet pump (13) is less than the vacuum pressure of the cavity between the vacuum chamber (1) and the vacuum isolation valve (12), if so, the steam jet pump (13) meets the design index, the jet pump load relief valve (14) and the jet pump load generating device (15) are closed, and the vacuum isolation valve (12) is opened at the same time, and step 5) is executed; otherwise, the first predetermined load flow rate is adjusted, and the return to step 3) is returned; 5) evacuating the cavity between the vacuum chamber (1) and the steam jet pump (13) by means of the steam jet pump (13) until the change value of the vacuum pressure is within ±5% and the stable duration is greater than or equal to 20 seconds; starting the vacuum chamber load generating device (31) according to the second predetermined load flow rate and simultaneously opening the vacuum chamber load relief valve (3); after the vacuum pressure of the cavity between the vacuum chamber (1) and the steam jet pump (13) is stabilized for a time greater than or equal to 20 seconds, closing the vacuum chamber load relief valve (3) and the vacuum chamber load generating device (31); 6) According to the working flow rate of 110%, the vacuum chamber load generating device (31) is started, and the vacuum chamber load relief valve (3) is opened at the same time, and it is determined whether the change value of the cavity vacuum pressure between the vacuum chamber (1) and the steam jet pump (13) is within ±5%, and the stable duration is greater than or equal to 20 seconds. If so, the vacuum pressure and temperature distribution of the diffuser (4), the water spray cooler (5), the first air collecting chamber (7), the cooler (9), the second air collecting chamber (11), and the steam jet pump (13) meet the design indicators, and the vacuum chamber load relief valve (3) and the vacuum chamber load generating device (31) are closed; otherwise, the second predetermined load flow rate is adjusted, and the process returns to step 5); 7) Close the vacuum isolation valve (12), the steam jet pump (13) and the data acquisition module, and stop collecting data.

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