Supersonic engine test stand and method of testing

Abstract

A kind of supersonic engine test bench, high-altitude simulation cabin is the shell structure of sealing, engine thrust measuring rack is fixedly installed in high-altitude simulation cabin, test engine is installed on engine thrust measuring rack;Intake system is communicated with the test engine or exhaust system, one end of exhaust system is fixedly installed in high-altitude simulation cabin through the shell surface of high-altitude simulation cabin, and the other end is fixedly communicated with the tail gas treatment system.The supersonic engine test bench of the application realizes the supersonic intake state simulation of supersonic engine when supersonic engine and engine ground test are carried out;At the same time, its engine thrust measuring rack realizes the measurement of engine thrust, simple structure, in addition, the exhaust gas of engine test bench is treated, so that the gas discharged from the gas outlet of alkaline spray tower meets the national pollutant discharge standard;Through setting silencing tower, the exhaust of exhaust system is silenced and noise is reduced, and noise pollution is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine test technology, and particularly to a supersonic engine test bench and a test method thereof. BACKGROUND

[0002] Engine test and test technology is an important part of solid propelling technology. Before flight test, an aero-engine needs to be tested on the ground at high altitude. When testing the engine, a group of inlet parameters, including total inlet pressure, inlet air flow, inlet oxygen content, and total inlet temperature, are required, which are called inlet state points. After reaching the set values and being stable, the performance and parameters are recorded or the performance is evaluated. With the increasing maturity of engines, supersonic engines are increasingly widely used. On this basis, the inlet system of a supersonic engine needs to simulate the supersonic inlet state of the supersonic engine when testing the engine on the ground, especially for an unmanned aerial vehicle. The existing engine test bench technology has no mature technology for simulating the inlet of a supersonic engine, and there is no accurate theoretical method for determining when the simulated state reaches a stable state, resulting in poor simulation effect, long test period, high cost, and serious waste of resources.

[0003] Secondly, thrust measurement is an important parameter that needs to be measured in engine test and test. To study the thrust of an engine, a large number of repeated tests need to be done. These tests cannot be done in flight tests. The main reasons are high cost, long cycle, small amount of information, risk, and large amount of manpower. Therefore, engine ground test is needed. Engine ground test refers to static test of a system on the ground according to specific conditions and environmental requirements to obtain performance index information of the system, so as to solve the key problems in the process of engine thrust test. However, there is no mature technology for engine thrust test equipment in the prior art.

[0004] Thirdly, for engine test benches of turbofan engines, solid rocket engines, and other aerospace engines, the main components of the exhaust gas are carbon dioxide and hydrogen sulfide, and contain a certain amount of particulate matter, mainly including boron trioxide and magnesium oxide. If the exhaust gas of the test bench is directly discharged into the atmosphere, it will cause serious pollution to the atmosphere and lead to the generation of acid rain. The particulate matter will also form PM10, PM2.5, and other pollutants to pollute the atmosphere, which is extremely environmentally unfriendly. However, there is no mature and effective method for treating the exhaust gas of the engine test bench of a turbofan engine, a solid rocket engine, and other aerospace engines in the prior art.

[0005] In addition, the noise source polluting the engine test bench and the surrounding environment is mainly the aerodynamic noise, which is generated when the high-pressure, high-speed and high-temperature compressed air and the gas flow in the metal or other enclosure or are discharged to the atmosphere, and the noise is as high as more than 130 dB(A). Noise is an unwanted sound, and the frequency of the sound that can be heard by the human ear is within 20 Hz to 20,000 Hz, which is the noise that can be directly perceived by people. The noise outside this frequency is the sound killer that cannot be perceived by the human ear, and is also the object of noise control. At present, different countries have different regulations on noise control. According to the relevant provisions of the Environmental Protection Law of China, the allowable noise level of a newly built enterprise working for 8 hours per day is 85 dB(A), and the allowable noise level of an enterprise working for 1 hour per day is 94 dB(A). For the engine test bench with a sound power greater than 130 dB(A) and a short working time, the working place of the test bench is far away from the city and the residential area, and the purpose of noise control is mainly to make the noise of the test bench working place reach the specified index and to reduce the noise of the environment outside the test bench as much as possible.

[0006] There is no very mature and effective technical means for the noise reduction method of the test bench. The applicant's previous application CN203910262U proposes a muffler, which has a certain effect on the noise reduction of the test bench. However, the staggered arrangement of the thick plate assembly and the thin plate assembly of the muffler requires a large floor area. On the one hand, when the exhaust flow of the engine test bench is small, in order to ensure the noise reduction quality, a plurality of thick plate assemblies and thin plate assemblies (at least 2 pieces of thick plate assembly and 2 pieces of thin plate assembly of the muffler, plus half a thick plate assembly and half a thin plate assembly of the muffler) are still needed, resulting in a substantial increase in cost. On the other hand, when the engine test bench has a small area for installing the noise reduction device and does not allow the staggered arrangement of the thick plate assembly and the thin plate assembly of the muffler as described in the patent application, removing any one of the noise reduction plates will result in a decrease in the noise reduction capacity. SUMMARY

[0007] The technical problem of the present application is to overcome the shortcomings of the prior art and provide a supersonic engine test bench and a test method thereof.

[0008] The technical solution of the present application is a supersonic engine test bench, which comprises an air intake system, an engine thrust measurement bench, an exhaust system, an exhaust treatment system and a high-altitude simulation cabin. The high-altitude simulation cabin is a sealed shell structure, the engine thrust measurement bench is fixedly installed in the high-altitude simulation cabin, and the test engine is installed on the engine thrust measurement bench. The air intake system is in communication with the test engine or the exhaust system, one end of the exhaust system is fixedly installed inside the high-altitude simulation cabin through the shell surface of the high-altitude simulation cabin, and the other end is in fixed communication with the exhaust treatment system.

[0009] The advantages of the present application compared with the prior art are:

[0010] 1、The supersonic engine test bed and test method of the present application, a Laval supersonic nozzle is arranged between the temperature simulation unit and the engine air inlet of the air inlet system, the supersonic air inlet state simulation of the supersonic engine is realized when the supersonic engine and the engine are tested on the ground, the engine air flow and total pressure are simulated through the engine air supply source, at the same time, the engine air is supplemented with oxygen through the oxygen supply source, and the engine air temperature is simulated through the temperature simulation unit, the real simulation of the engine air is realized, and the simulation precision is high; an alcohol supply source is arranged, alcohol is ignited by an igniter to generate heat and exchange heat with the engine air in the temperature simulation unit, the engine air temperature is adjusted; the oil supply of the engine is realized through the fuel supply source; the flow and pressure of the related supply sources are adjustable through the arrangement of various valves, and the simulation of multiple state points is realized.

[0011] 2、The supersonic engine test bed and test method of the present application, the tested engine is arranged in the simulation cabin, the simulation cabin adopts a sealed state, the exhaust ejector is used to exhaust air, the environment pressure of the engine at different flight altitudes is simulated, the active air flow supply source of the ejector is used to provide the ejecting air flow for the exhaust ejector, and the method is simple; the oil supply of the engine is realized through the fuel supply source.

[0012] 3、The supersonic engine test bed and test method of the present application, the engine thrust measurement bed realizes the measurement of the engine thrust, and the structure is simple.

[0013] 4、The supersonic engine test bed and test method of the present application, the engine thrust measurement bed, the movable frame is ingeniously hung on the fixed frame through spring sheets, and the thrust of the engine is measured by the force sensor, which is simple and easy to implement.

[0014] 5、The supersonic engine test bed and test method of the present application, in the engine thrust measurement bed, the measurement section bracket is arranged to ensure that the measurement section for measuring the air inlet parameters of the tested engine is coaxial with the engine, the precision of the engine air simulation is ensured, and the precision of the engine air parameter measurement is improved.

[0015] 6、The supersonic engine test bed and test method of the present application, in the engine thrust measurement bed, the overall rigidity of the movable frame is large, in order to ensure the dynamic performance of the test bed, the force receiving elements are reasonably distributed in the design, the structure equivalent strength principle is adopted, the non-force receiving part of the material is removed, and the mass of the movable frame is reduced through the optimization design.

[0016] 7. The supersonic engine test bench and test method of the present application, in the engine thrust measuring bench, a horizontal base is arranged in the fixed frame to improve the bearing capacity of the whole fixed frame.

[0017] 8. The supersonic engine test bench and test method of the present application, in the engine thrust measuring bench, a locking state is arranged to keep the movable frame and the fixed frame in a fixed state when the engine is not tested or installed before testing, thereby prolonging the service life of the engine thrust measuring bench and avoiding irreversible external force applied to the spring sheet or damage to the spring sheet when the movable frame is installed in a self state (without using the locking state) and related test pieces, thereby ensuring the accuracy of the engine thrust measuring bench.

[0018] 9. The supersonic engine test bench and test method of the present application, in the engine thrust measuring bench, a gantry type engine mounting frame is used to suspend the engine, thereby improving the measurement accuracy of the engine thrust, and the front joint and rear joint positions are adjustable, thereby greatly improving the application range of the engine mounting frame and solving the problem of one engine mounting frame for one engine.

[0019] 10. The supersonic engine test bench and test method of the present application, in the engine thrust measuring bench, a standard force sensor is used to determine the error of the working force sensor, and static calibration is performed, thereby generating a set of high-precision known "simulated thrust" to calibrate the force measuring system. Since it reproduces the deformation and stress condition of the test state, it eliminates most of the system errors caused by deformation, installation, temperature, constraints and other factors during testing, thereby reducing the uncertainty of thrust measurement.

[0020] 11. The supersonic engine test bench and test method of the present application, in the engine thrust measuring bench, the characteristic curve graph of the standard force sensor and the working force sensor is drawn through calibration, and the real value of the force output by the working force sensor is accurately determined through the characteristic curve graph, thereby avoiding calibration of the working force sensor for each test, reducing cost and improving efficiency.

[0021] 12. The supersonic engine test bench and test method of the present application, in the exhaust treatment system, a closed circulating pool and two sets of alkaline spraying benches are arranged to realize the treatment of the engine test bench exhaust, so that the gas discharged from the gas outlet of the alkaline spraying tower meets the national pollutant emission standard. Two sets of parallel alkaline spraying benches are arranged to divide the engine test bench exhaust into two paths for alkaline spraying, thereby reducing the flow rate of the engine test bench exhaust through the alkaline spraying tower, making the alkaline spraying process more sufficient, reducing the workload of each alkaline spraying tower, and further fully performing alkaline spraying. At the same time, by arranging the silencing tower, the exhaust of the exhaust system is silenced and noise is reduced, thereby avoiding noise pollution.

[0022] 13. The supersonic engine test bench and its test method of the present invention, in its exhaust gas treatment system, creatively proposes a combination of thin and thick silencer plates during the silencing process. This achieves the setting of thin and thick silencer plates on two sides of an airflow channel, respectively. While ensuring silencing capacity, it reduces the number of silencer plates used (for existing technologies, each layer of silencer plate assembly requires at least two thick silencer plates and two thin silencer plates, plus a thick silencer plate assembly and a thin silencer plate assembly of half a silencer plate, while the silencer plate assembly proposed in this invention is equivalent to only one thick silencer plate assembly and one thin silencer plate assembly, plus a thick silencer plate assembly and a thin silencer plate assembly of half a silencer plate). It has a small footprint (suitable for both high-flow-rate test benches and low-flow-rate engine test benches), a wide range of applications, and also significantly reduces costs.

[0023] 14. The supersonic engine test bench and test method of the present invention, wherein the exhaust gas treatment system, during the silencing process, has guide vanes set on the silencing plates to guide the gas entering the airflow channel, so that the gas flow is uniform and the silencing effect is further improved.

[0024] 15. The supersonic engine test bench and its test method of the present invention, its exhaust gas treatment system, and its engine test bench exhaust gas treatment system, creatively set up two spray systems in each alkaline spray tower to make the spraying more thorough.

[0025] 16. The supersonic engine test bench and test method of the present invention, wherein the exhaust gas treatment system has a packing layer filled with ceramic material in each spray system, which greatly improves the treatment capacity of the alkaline spray tower.

[0026] 17. The supersonic engine test bench and test method of the present invention, in its exhaust gas treatment system, by setting up a circulating water pool, wastewater treatment equipment and closed cooling tower, realizes the reuse of alkaline circulating water, and significantly reduces the test cost.

[0027] 18. The supersonic engine test bench and test method of the present invention, wherein the exhaust gas treatment system adds a spray system in the silencer tower to further degrade the exhaust gas, thereby further improving the exhaust gas treatment capacity. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the supersonic engine test bench of the present invention.

[0029] Figure 2 This is a front view of the engine thrust measurement rig in the supersonic engine test bench of the present invention.

[0030] Figure 3 for Figure 2Enlarged view of middle A.

[0031] Figure 4 For Figure 2 Enlarged view of middle B.

[0032] Figure 5 For the supersonic engine test bed of the present application, the engine thrust measurement test bed structure top view.

[0033] Figure 6 For Figure 5 Enlarged view of middle C.

[0034] Figure 7 For the supersonic engine test bed of the present application, the engine thrust measurement test bed structure top view.

[0035] Figure 8 For Figure 7 Enlarged view of middle D.

[0036] Figure 9 For Figure 7 Enlarged view of middle E.

[0037] Figure 10 For the supersonic engine test bed of the present application, the engine thrust measurement test bed structure top view.

[0038] Figure 11 For the supersonic engine test bed of the present application, the engine thrust measurement test bed structure top view.

[0039] Figure 12 For the supersonic engine test bed of the present application, the engine thrust measurement test bed structure top view.

[0040] Figure 13 For the supersonic engine test bed of the present application, the engine thrust measurement test bed structure top view.

[0041] Figure 14 For the supersonic engine test bed of the present application, the engine thrust measurement test bed structure top view.

[0042] Figure 15 For the supersonic engine test bed of the present application, the engine thrust measurement test bed structure top view.

[0043] Figure 16 For the supersonic engine test bed of the present application, the engine thrust measurement test bed structure top view.

[0044] Figure 17It is the structure diagram of the three-layered sound-absorbing piece assembly of the exhaust treatment system in the supersonic engine test bed of the application.

[0045] Figure 18 It is the structure diagram of the one-layered sound-absorbing piece assembly of the exhaust treatment system in the supersonic engine test bed of the application.

[0046] Figure 19 It is the structure diagram of the semi-thin sound-absorbing piece of the exhaust treatment system in the supersonic engine test bed of the application.

[0047] Figure 20 It is the structure diagram of the semi-thin sound-absorbing piece of the exhaust treatment system in the supersonic engine test bed of the application.

[0048] Figure 21 It is the structure diagram of the semi-thin sound-absorbing piece of the exhaust treatment system in the supersonic engine test bed of the application. DETAILED DESCRIPTION

[0049] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the features defined as "first" and "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, unless otherwise specified and limited, the term "a plurality of" means two or more.

[0050] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting", "abutting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] The pressure, total pressure, static pressure, dynamic pressure, temperature, total temperature, static temperature and dynamic temperature involved in the application are the same as those in the prior application (application number: CN201811164303.1, invention name: a supersonic engine test stand) of the applicant, in addition, the air intake system of the engine test stand is provided with temperature sensors and pressure sensors at the inlet and outlet of the first medium channel, in the first medium channel, at the inlet and outlet of the second medium channel, in the second medium channel, at the inlet and outlet of the supersonic nozzle, and in the supersonic nozzle, the temperature sensors and pressure sensors are arranged in the direction of the air flow, and are used for measuring the total pressure and total temperature of the sensor cross section.

[0052] A supersonic engine, especially a test stand suitable for a supersonic engine with a Mach number of 1-5, such as a turbofan engine, a solid rocket engine and other aerospace engines, especially a test stand suitable for high-altitude multi-state point simulation test of a supersonic engine, wherein the parameters of each state point in the high-altitude multi-state point of the supersonic engine include engine intake total pressure, intake air flow, intake oxygen composition, intake total temperature, engine oil supply, and air environment pressure. The supersonic engine test stand comprises an air intake system, an engine thrust measurement stand, an exhaust system 700, a tail gas treatment system 800 and a high-altitude simulation cabin 900; the high-altitude simulation cabin 900 is a sealed shell structure, and its shape is not limited, which can be a cuboid, an ellipsoid or the like; the engine thrust measurement stand is fixedly installed in the high-altitude simulation cabin 900, and the tested engine 1 is installed on the engine thrust measurement stand; the air intake system is in communication with the tested engine 1 and / or the exhaust system 700, one end of the exhaust system 700 is fixedly installed in the high-altitude simulation cabin 900 through the shell surface of the high-altitude simulation cabin 900, and the other end is in fixed communication with the tail gas treatment system 800.

[0053] The air intake system comprises a supply source, a temperature simulation unit 60 and a supersonic nozzle 401.

[0054] The supply source comprises a fuel supply source 10, an oxygen supply source 20, an engine air supply source 30, an alcohol supply source 40 and an ejector active airflow supply source 50.

[0055] The temperature simulation unit comprises a pipe body 61 and a shell 62, the pipe body 61 is located inside the shell 62, a first medium channel is formed in the pipe body 61, and a space between an outer wall of the pipe body 61 and an inner wall of the shell 62 forms a second medium channel; when the temperature simulation unit 60 works, a first medium flows in the first medium channel, and a second medium flows in the second medium channel, the temperature of the first medium is higher than that of the second medium, the first medium and the second medium realize heat exchange through a pipe wall of the pipe body 61, and an outlet of the supersonic nozzle 401 is fixedly connected with an air inlet of the test engine 1.

[0056] The fuel supply source 10 is connected with the test engine 1 through a pipeline, the oxygen supply source 20 and the engine air supply source 30 are respectively connected with an inlet of the second medium channel through pipelines, an outlet of the second medium channel is connected with an inlet of the inlet straight section 610 of the supersonic nozzle 401 through a pipeline, and an outlet of the supersonic expansion section 650 of the supersonic nozzle 401 is connected with an air inlet of the test engine through a pipeline, so that the test engine 1 is connected with the air inlet, and simulated engine supersonic air inlet flow, air inlet Mach number, air inlet total pressure and oxygen content are provided for the test engine 1; the alcohol supply source 40 is connected with an inlet of the first medium channel through a pipeline after passing through an igniter, an outlet of the first medium channel is connected with the outside, the igniter ignites alcohol to generate heat, and the heat exchanges with the second medium in the temperature simulation unit 60 to adjust the temperature of the second medium in the second medium channel, so that the engine air temperature simulation is realized, the engine air simulation of the present application is real, high in precision, and simple in structure.

[0057] Preferably, the exhaust system 700 of the present application is a tail chamber combined with an ejector structure, which comprises a tail chamber section 710, an ejector low pressure chamber 720, an ejector converging section 730, an ejector constant section 740 and an ejector expanding section 750 fixedly connected in sequence, the outlet of the ejector expanding section 750 is communicated with the tail gas treatment system input pipeline 850 of the tail gas treatment system 800, and the tail gas treatment system input pipeline 850 is respectively communicated with the spray tower gas inlet 802 of the first alkali liquor spray tower 810 and the second alkali liquor spray tower 820 of the tail gas treatment system. A replaceable small tail chamber is fixedly installed in the tail chamber section 710, and the exhaust system 700 is a prior art, which is specifically described in the Chinese invention patent ZL 201610786167.4 of the applicant. The ejector active airflow supply source 50 is communicated with the ejector low pressure chamber 720 of the exhaust system 700 through a pipeline.

[0058] The pipeline for communicating the fuel supply source 10 with the test engine 1 is provided with an engine fuel supply flow regulating valve 51, the pipeline for communicating the oxygen supply source 20 with the inlet of the second medium channel is provided with an oxygen supply flow regulating valve 53, the pipeline for communicating the engine air intake supply source 30 with the inlet of the second medium channel is provided with an engine air intake supply pressure regulating valve 55, the pipeline for communicating the alcohol supply source 40 with the inlet of the first medium channel is provided with an alcohol supply flow regulating valve 56, and the pipeline for communicating the ejector active airflow supply source 50 with the exhaust system 700 is provided with an ejector active airflow supply pressure regulating valve 58, so as to realize the parameter regulation of each supply source and meet the simulation of multiple state points.

[0059] Preferably, the intake system comprises an engine fuel supply cutoff valve 52, an oxygen supply cutoff valve 54 and an alcohol supply cutoff valve 57, the engine fuel supply cutoff valve 52 is arranged on the pipeline for communicating the fuel supply source 10 with the test engine 1, the oxygen supply cutoff valve 54 is arranged on the pipeline for communicating the oxygen supply source 20 with the inlet of the second medium channel, and the alcohol supply cutoff valve 57 is arranged on the pipeline for communicating the alcohol supply source 40 with the inlet of the first medium channel. During the use of the intake system, the engine fuel supply cutoff valve 52 is opened before the engine fuel supply flow regulating valve 51 is opened, the oxygen supply cutoff valve 54 is opened before the oxygen supply flow regulating valve 53 is opened, and the alcohol supply cutoff valve 57 is opened before the alcohol supply flow regulating valve 56 is opened; the engine fuel supply cutoff valve 52 is closed after the engine fuel supply flow regulating valve 51 is closed, the oxygen supply cutoff valve 54 is closed after the oxygen supply flow regulating valve 53 is closed, and the alcohol supply cutoff valve 57 is closed after the alcohol supply flow regulating valve 56 is closed, so as to ensure the safety of the intake system in a non-experimental state.

[0060] The engine thrust measuring bench comprises a fixed frame 100, a movable frame 200 and a loading measuring device; the loading measuring device comprises spring sheets, a loading mechanism 330 and a working force sensor 350; the movable frame 200 is suspended on the fixed frame 100 through the spring sheets, the loading mechanism 330 is fixedly installed on the fixed frame 100, and the working force sensor 350 is connected to the fixed frame 100 and the movable frame 200 at both ends respectively.

[0061] The fixed frame comprises a base 110, a front mounting seat 120, a loading mechanism mounting seat 130, a first fixed frame spring sheet mounting seat 140, a fixed frame working force sensor mounting seat 150, a rear mounting seat 160 and a second fixed frame spring sheet mounting seat 170; the base 110 is a cuboid structure, the front mounting seat 120 and the rear mounting seat 160 are fixedly installed at the front end and the rear end of the base 110 respectively along the length direction of the base 110, the rear mounting seat 160 comprises a horizontal plate and a vertical plate, and the horizontal plate and the vertical plate form an “L” shape; the loading mechanism mounting seat 130 is fixedly installed on the front mounting seat 120, the first fixed frame spring sheet mounting seat 140 comprises a first right fixed frame spring sheet mounting seat 141 and a first left fixed frame spring sheet mounting seat 142, the first right fixed frame spring sheet mounting seat 141 and the first left fixed frame spring sheet mounting seat 142 are fixedly installed at the front end of the base 110 and are located on both sides of the front mounting seat 120 respectively; the fixed frame working force sensor mounting seat 150 is fixedly installed on the base 110 and is located on the center line along the length direction of the base 110; the second fixed frame spring sheet mounting seat 170 comprises a second right fixed frame spring sheet mounting seat 171 and a second left fixed frame spring sheet mounting seat 172, the second right fixed frame spring sheet mounting seat 171 and the second left fixed frame spring sheet mounting seat 172 are fixedly installed at the rear end of the base 110 and are located on both sides of the rear mounting seat 160 respectively.

[0062] The moving frame 200 comprises a moving frame body 210, a first moving frame spring sheet mounting seat 220, a moving frame working force sensor mounting seat 230, a second moving frame spring sheet mounting seat 240 and a moving frame standard force sensor mounting seat 250. The moving frame body 210 comprises a right moving frame body 211, a left moving frame body 212 and a moving frame connecting plate 260. The right moving frame body 211 and the left moving frame body 212 are of the same structure, are both cuboid structures and are both parallel to the base 110. The center lines of the right moving frame body 211 and the left moving frame body 212 along the length direction are parallel to the center line of the base 110 along the length direction. The right moving frame body 211 and the left moving frame body 212 are symmetrically arranged relative to the center line of the base 110 along the length direction. The moving frame connecting plate 260 is a plurality of, and the plurality of moving frame connecting plates 260 fixedly connect the right moving frame body 211 and the left moving frame body 212. Along the length direction of the moving frame body 210, the moving frame standard force sensor mounting seat 250 is fixedly mounted on the bottom surface of the front end of the moving frame body 210. The first moving frame spring sheet mounting seat 220 comprises a first right moving frame spring sheet mounting seat and a first left moving frame spring sheet mounting seat. The first right moving frame spring sheet mounting seat and the first left moving frame spring sheet mounting seat are respectively fixedly mounted on the bottom surface of the front end of the right moving frame body 211 and the left moving frame body 212 and are respectively located on both sides of the moving frame standard force sensor mounting seat 250. The moving frame working force sensor mounting seat 230 is fixedly mounted on the bottom of a certain moving frame connecting plate 260 of the moving frame body 210 and is located on the center line along the length direction of the moving frame body 210. The second moving frame spring sheet mounting seat 240 comprises a second right moving frame spring sheet mounting seat and a second left moving frame spring sheet mounting seat. The second right moving frame spring sheet mounting seat and the second left moving frame spring sheet mounting seat are respectively fixedly mounted on the bottom surface of the rear end of the right moving frame body 211 and the left moving frame body 212.

[0063] The loading measuring device comprises a first spring sheet 310, a second spring sheet 320, a loading mechanism 330, a standard force sensor 340 and a working force sensor 350; the first spring sheet 310 comprises a first right spring sheet 311 and a first left spring sheet 312, two ends of the first right spring sheet 311 are fixedly connected with a first right fixed frame spring sheet mounting seat 141 and a first right movable frame spring sheet mounting seat respectively, and two ends of the first left spring sheet 312 are fixedly connected with a first left fixed frame spring sheet mounting seat 142 and a first left movable frame spring sheet mounting seat respectively; the second spring sheet 320 comprises a second right spring sheet 321 and a second left spring sheet 322, two ends of the second right spring sheet 321 are fixedly connected with a second right fixed frame spring sheet mounting seat 171 and a second right movable frame spring sheet mounting seat respectively, and two ends of the second left spring sheet 322 are fixedly connected with a second left fixed frame spring sheet mounting seat 172 and a second left movable frame spring sheet mounting seat respectively; the loading mechanism 330 is fixedly installed on a horizontal plate of the front mounting seat 120, the standard force sensor 340 is fixedly installed on a baffle at a front end of the movable frame frame body 210, the loading mechanism 330 and the standard force sensor 340 are coaxially arranged and are parallel to a center line in a length direction of the base 110; two ends of the working force sensor 350 are fixedly connected with a fixed frame working force sensor mounting seat 150 and a movable frame working force sensor mounting seat 230 respectively, and the working force sensor 350 is coaxially arranged with the loading mechanism 330 and the standard force sensor 340; the loading mechanism 330 comprises a servo motor, a motor power supply, a hydraulic loading device, a calibration oil cylinder, the motor power supply is electrically connected with the servo motor, the servo motor is connected with the hydraulic loading device and the calibration oil cylinder in sequence, and a piston of the calibration oil cylinder is connected with the standard force sensor.

[0064] The engine thrust measuring bench comprises a measuring section carrier for supporting a measuring section, the measuring section carrier comprises a first measuring section carrier 410 and a second measuring section carrier 420 which are coaxially arranged, the first measuring section carrier 410 and the second measuring section carrier 420 are identical in structure and are fixedly installed on the top surface of the movable frame 210; the measuring section carrier comprises a measuring section carrier support 411, a measuring section carrier lower ring 412, a measuring section carrier upper ring 413, a measuring section carrier positioning mechanism 414 and a locking device 415; the bottom surface of the measuring section carrier support 411 is fixedly connected with the top surface of the movable frame 210, the measuring section carrier lower ring 412 and the measuring section carrier upper ring 413 are both semicircular structures, and the measuring section carrier lower ring 412 and the measuring section carrier upper ring 413 form a circle after being connected; the measuring section carrier lower ring 412 is integrally formed with the measuring section carrier support 411; the measuring section carrier positioning mechanism 414 is three in number and identical in structure, and is used for positioning the measuring section for measuring the intake parameter of the test engine 1; in this application, the supersonic nozzle 401 is the measuring section, and a temperature sensor and a pressure sensor are fixedly installed on the pipe wall at the outlet of the nozzle, the temperature sensor and the pressure sensor are both arranged in the direction of the airflow, and are used for measuring the total pressure and total temperature of the section where the sensors are arranged, that is, the engine inlet gas parameter; the three measuring section carrier positioning mechanisms 414 are uniformly distributed along the radial direction of the circle formed after the measuring section carrier lower ring 412 and the measuring section carrier upper ring 413 are connected, wherein one measuring section carrier positioning mechanism 414 is arranged at the top of the measuring section carrier upper ring 413, and the remaining two measuring section carrier positioning mechanisms 414 are arranged on the measuring section carrier lower ring 412; the measuring section carrier positioning mechanism 414 comprises a positioning mechanism nut 4141, a positioning mechanism locking nut 4142 and a positioning mechanism screw 4143, the positioning mechanism screw 4143 penetrates through the measuring section carrier lower ring 412 or the measuring section carrier upper ring 413, the positioning mechanism locking nut 4142 is sleeved on the positioning mechanism screw 4143 and is arranged outside the measuring section carrier lower ring 412 or the measuring section carrier upper ring 413 and abuts against the measuring section carrier lower ring 412 or the measuring section carrier upper ring 413, and is used for locking the positioning mechanism screw 4143, and the positioning mechanism nut 4141 is sleeved on the positioning mechanism screw 4143 and abuts against the positioning mechanism locking nut 4142.There are two locking devices 415 with the same structure, which are used to fixedly connect the lower ring 412 and the upper ring 413 of the measuring section bracket. The two locking devices 415 are arranged at the connection end of the lower ring 412 and the upper ring 413 of the measuring section bracket. The locking device 415 includes an upper locking plate 4151, a lower locking plate 4152, a locking bolt 4153 and a locking nut 4154. The upper locking plate 4151 is fixedly connected to the front end face of the upper ring 413 of the measuring section bracket, and the lower surface of the upper locking plate 4151 coincides with the lower surface of the upper ring 413 of the measuring section bracket. The lower locking plate 4152 is fixedly connected to the front end face of the lower ring 412 of the measuring section bracket, and the upper surface of the lower locking plate 4152 coincides with the upper surface of the lower ring 412 of the measuring section bracket. The locking bolt 4153 passes through the lower locking plate 4152 and the upper locking plate 4151 in sequence, and the locking nut 4154 cooperates with the locking bolt 4153 and abuts against the upper locking plate 4151.;

[0065] The engine thrust measurement bench includes a locking device. The locking device includes a set screw 510, a set baffle 520 and a set nut 530. The set screw 510 passes through the rear baffle of the moving frame body 210, the set baffle 520, the vertical plate of the rear mounting seat 160 and the set nut 530 in sequence. The set nut 530 cooperates with the set screw 510, and both the set baffle 520 and the set nut 530 abut against the vertical plate of the rear mounting seat 160.

[0066] The engine thrust measurement bench includes an engine mounting frame 600. The engine mounting frame 600 includes an engine mounting top frame 610, left and right columns 620 and 630 with the same structure, a front joint 640, a rear joint 650 and a lifting lug 660. The bottom surfaces of the left column 620 and the right column 630 are detachably connected to the moving frame 200. The engine mounting top frame 610 is fixedly connected to the top surfaces of the left column 620 and the right column 630 to form a gantry type. The front joint 640 and the rear joint 650 are detachably mounted on the engine mounting top frame 610, and the lifting lug 660 is fixedly connected to the engine mounting top frame 610. The engine mounting top frame 610 includes a front beam 611, a rear beam 612 and a longitudinal beam 613. The front beam 611 and the rear beam 612 are arranged in parallel and are both fixedly connected to the longitudinal beam 613. The rear beam 612 is fixedly connected to one end of the longitudinal beam 613. The front beam 611, the rear beam 612 and the longitudinal beam 613 form a "soil" shape. Installation holes 614 for installing the front joint 640 and the rear joint 650 are provided on the longitudinal beam 613. The left column 620 includes a front column 621, a rear column 622 and a column connecting rod 623. The front column 621 and the rear column 622 are arranged in parallel and are fixedly connected by a plurality of column connecting rods 623.

[0067] The engine thrust measuring bench comprises a force sensor calibration device, the force sensor calibration device comprises an industrial computer, a display, a standard force sensor data acquisition device and a working force sensor data acquisition device; the industrial computer is electrically connected with the display and the servo motor respectively, the standard force sensor data acquisition device is electrically connected with the standard force sensor and the industrial computer respectively, and the working force sensor data acquisition device is electrically connected with the working force sensor and the industrial computer respectively.

[0068] The tail gas treatment system 800 comprises a first lye spraying tower 810, a second lye spraying tower 820, a lye supply pool 830, a silencing tower 840 and a tail gas treatment system input pipeline 850. The lye supply pool 830 is a closed reinforced concrete structure and is filled with lye inside.

[0069] The first caustic liquid spray tower 810 and the second caustic liquid spray tower 820 have the same structure. The first caustic liquid spray tower 810 comprises a spray tower body 801, a spray tower gas inlet 802, a spray tower gas outlet 803, a spray tower caustic liquid inlet 804, a spray tower first packing layer 805, a spray tower first spray system 806, a spray tower second packing layer 807, a spray tower second spray system 808, a spray tower liquid level meter 809, a spray tower circulating pump 811, a spray tower overflow port 812, a spray tower blowdown port 813, and a spray tower maintenance port 814. The spray tower body 801 is a hollow cylindrical structure. The spray tower gas inlet 802, the spray tower caustic liquid inlet 804, the spray tower overflow port 812, the spray tower blowdown port 813, and the spray tower maintenance port 814 are arranged on the side of the spray tower body 801. The spray tower gas outlet 803 is arranged on the top of the spray tower body 801. The spray tower gas inlets 802 of the first caustic liquid spray tower 810 and the second caustic liquid spray tower 820 are connected with the tail gas treatment system input pipeline 850. The spray tower gas outlets 803 are connected with the sound attenuation tower 840 through a pipeline. One end of the pipeline for conveying caustic liquid to the spray system is connected with the caustic liquid supply tank 830, and the other end is connected with the spray tower first spray system 806 and the spray tower second spray system 808 through the spray tower caustic liquid inlet 804. The spray tower circulating pump 811 is arranged outside the spray tower body 801. The spray tower circulating pump 811 pumps the caustic liquid in the caustic liquid supply tank 830 to the spray tower first spray system 806 and the spray tower second spray system 808 through the pipeline for conveying caustic liquid to the spray system. Preferably, a seal is arranged at the spray tower caustic liquid inlet 804. The spray tower overflow port 812 is arranged higher than the spray tower gas inlet 802, the spray tower caustic liquid inlet 804, and the spray tower blowdown port 813. The spray tower blowdown port 813 is connected with the external wastewater treatment equipment 850 through a pipeline. The spray tower first packing layer 805, the spray tower first spray system 806, the spray tower second packing layer 807, and the spray tower second spray system 808 are sequentially and fixedly arranged in the spray tower body 801 along the axis of the spray tower body 801 from bottom to top. Preferably, the packing in the spray tower first packing layer 805 and the spray tower second packing layer 807 is ceramic packing. The spray tower liquid level meter is arranged on the side of the spray tower body 801 and located below the spray tower first packing layer 805, for monitoring the water level of the wastewater at the bottom of the spray tower body 801.

[0070] The sound attenuation tower 840 is a reinforced concrete structure, which includes a bottom-communicating inlet sound attenuation sheet installation cavity 841 and an outlet sound attenuation sheet installation cavity 842, the inlet sound attenuation sheet installation cavity 841 is fixedly installed with an inlet sound attenuation sheet assembly 843, the outlet sound attenuation sheet installation cavity 842 is fixedly installed with an outlet sound attenuation sheet assembly 844, the spray tower gas outlet 803 of the first lye spray tower 810 and the second lye spray tower 820 is communicated with the inlet sound attenuation sheet installation cavity 841 of the sound attenuation tower 840 through a pipeline, and the outlet of the outlet sound attenuation sheet installation cavity 842 is communicated with the atmosphere; in the outlet sound attenuation sheet installation cavity 842, below the outlet sound attenuation sheet assembly 844, from bottom to top, a lower layer spray system 845, a middle layer spray system 846 and an upper layer spray system 847 are fixedly installed in sequence, the lower layer spray system 845, the middle layer spray system 846 and the upper layer spray system 847 are communicated with the alkaline liquid supply pool 830 through a pipeline, and a pump for pumping the alkaline liquid in the alkaline liquid supply pool 830 to the lower layer spray system 845, the middle layer spray system 846 and the upper layer spray system 847 is arranged outside the sound attenuation tower 840. The inlet sound attenuation sheet assembly 843 and the outlet sound attenuation sheet assembly 844 are the same in structure.

[0071] The inlet sound attenuation sheet assembly 843 includes a lower layer sound attenuation sheet assembly 888431, a middle layer sound attenuation sheet assembly 888432 and an upper layer sound attenuation sheet assembly 888433 arranged in sequence from bottom to top; each layer of sound attenuation sheet assembly includes half-thin sound attenuation sheets 8431, half-thick sound attenuation sheets 8432 and thin-thick combined sound attenuation sheets 8433 arranged at intervals; in each layer of sound attenuation sheet assembly, the half-thin sound attenuation sheets 8431 and the half-thick sound attenuation sheets 8432 are arranged at both ends and are fixedly connected with both end faces of the inlet sound attenuation sheet installation cavity 841 of the sound attenuation tower 840, and a plurality of thin-thick combined sound attenuation sheets 8433 are arranged at intervals in the middle of the half-thin sound attenuation sheets 8431 and the half-thick sound attenuation sheets 8432, and adjacent sound attenuation sheets constitute airflow channels; the installation method of each layer of sound attenuation sheet assembly and the connection method with the tower body are prior art, and the specific mode is basically the same as the prior application (CN201482057351.1) of the applicant.

[0072] On the same end side, the adjacent 2 layers of the sound attenuation piece are different in type, so that the air flow channels formed by the adjacent sound attenuation piece assemblies are staggered, thereby improving the sound attenuation capacity of the sound attenuation device. In a preferred embodiment of the present application, along the horizontal direction of the sound attenuation tower, in the lower layer sound attenuation piece assembly 888431, the arrangement mode of the sound attenuation pieces is half-thin sound attenuation piece 8431, thin-thick combined sound attenuation piece 8433, thin-thick combined sound attenuation piece 8433, and half-thick sound attenuation piece 8432, wherein the thick sound attenuation piece portions of the thin-thick combined sound attenuation piece 8433 all face the half-thin sound attenuation piece 8431; in the middle layer sound attenuation piece assembly 888432, the arrangement mode of the sound attenuation pieces is half-thick sound attenuation piece 8432, thin-thick combined sound attenuation piece 8433, thin-thick combined sound attenuation piece 8433, and half-thin sound attenuation piece 8431, wherein the thick sound attenuation piece portions of the thin-thick combined sound attenuation piece 8433 all face the half-thin sound attenuation piece 8431; in the upper layer sound attenuation piece assembly 888433, the arrangement mode of the sound attenuation pieces is half-thin sound attenuation piece 8431, thin-thick combined sound attenuation piece 8433, thin-thick combined sound attenuation piece 8433, and half-thick sound attenuation piece 8432, wherein the thick sound attenuation piece portions of the thin-thick combined sound attenuation piece 8433 all face the half-thin sound attenuation piece 8431.

[0073] The half-thin sound attenuation piece 8431 comprises a half-thin sound attenuation piece flat piece 884311 and two half-thin sound attenuation piece flow guide cone pieces 884312 fixedly connected to both ends of the half-thin sound attenuation piece flat piece 884311. Preferably, the two half-thin sound attenuation piece flow guide cone pieces 884312 are integrally formed with the half-thin sound attenuation piece flat piece 884311. The surfaces of the half-thin sound attenuation piece flat piece 884311 and the half-thin sound attenuation piece flow guide cone piece 884312 are provided with a plurality of sound attenuation piece micro holes 8434, which are through holes penetrating the surfaces of the half-thin sound attenuation piece flat piece 884311 and the half-thin sound attenuation piece flow guide cone piece 884312. The structure of the half-thin sound attenuation piece 8431 is prior art, which is the half-piece structure of the thin piece assembly in the prior application (application number: CN201482056663.0, invention name: thin piece assembly for sound attenuation device) of the applicant. The half-thin sound attenuation piece flow guide cone piece 884312 is arranged to guide the gas entering the air flow channel, so that the gas flows uniformly, and the sound attenuation effect is further improved.

[0074] The half-thickness sound elimination sheet 8432 comprises a half-thickness sound elimination sheet flat sheet 884321 and two half-thickness sound elimination sheet flow guide cone sheets 884322, which are fixedly connected with the two ends of the half-thickness sound elimination sheet flat sheet 884321, and preferably, the two half-thickness sound elimination sheet flow guide cone sheets 884322 are integrally formed with the half-thickness sound elimination sheet flat sheet 884321; the surfaces of the half-thickness sound elimination sheet flat sheet 884321 and the half-thickness sound elimination sheet flow guide cone sheet 884322 are provided with a plurality of sound elimination sheet micro-holes 8434, which are through holes penetrating the surfaces of the half-thickness sound elimination sheet flat sheet 884321 and the half-thickness sound elimination sheet flow guide cone sheet 884322; wherein the structure of the half-thickness sound elimination sheet 8432 is a half-sheet structure of a sheet assembly in the prior art, which is a prior application (application number: CN201482056662.6, invention name: thick sheet assembly for silencer) of the applicant; by arranging the half-thickness sound elimination sheet flow guide cone sheet 884322, the gas flow entering the airflow channel is guided, so that the gas flows uniformly, and the sound elimination effect is further improved.

[0075] The thin-thick combined sound elimination sheet 8433 is a combined sheet formed by horizontally fixedly connecting the half-thin sound elimination sheet 8431 and the half-thickness sound elimination sheet 8432; in the combined thin-thick combined sound elimination sheet 8433, the half-thin sound elimination sheet flat sheet 884311 and the half-thickness sound elimination sheet flat sheet 884321 are arranged in parallel to form a thin-thick combined sound elimination sheet flat sheet 884331 of the thin-thick combined sound elimination sheet 8433, and the two half-thin sound elimination sheet flow guide cone sheets 884312 and the two half-thickness sound elimination sheet flow guide cone sheets 884322 form two thin-thick combined sound elimination sheet flow guide cone sheets 884332 of the thin-thick combined sound elimination sheet 8433; by arranging the thin-thick combined sound elimination sheet flow guide cone sheet 884332, the gas flow entering the airflow channel is guided, so that the gas flows uniformly, and the sound elimination effect is further improved.

[0076] The thickness of the half-thin sound elimination sheet 8431 is L1, the thickness of the half-thickness sound elimination sheet 8432 is L2, and the thickness of the thin-thick combined sound elimination sheet 8433 is L3, wherein L1

[0077] Preferably, the diameter of the sound elimination sheet micro-hole 8434 is 0.6mm-1mm, and further preferably, the diameter of the sound elimination sheet micro-hole 8434 is 0.8mm.

[0078] Preferably, the horizontal cross section in the inlet sound elimination sheet mounting cavity 841 and the outlet sound elimination sheet mounting cavity 842 is a square channel, and the wall thickness of the tower body 811 is 0.5m, and further preferably, the horizontal cross section in the tower body 811 is a square channel with a size of 0.5m*0.5m.

[0079] Preferably, the thickness L1 of the semi-thin soundproof sheet 8431 is 80mm-85mm, and more preferably, the thickness L1 of the semi-thin soundproof sheet 8431 is 82mm.

[0080] Preferably, the thickness L2 of the semi-thin soundproof sheet 8432 is 195mm-205mm, and more preferably, the thickness L2 of the semi-thin soundproof sheet 8432 is 820mm.

[0081] Preferably, the alkaline liquid supply tank 830 is provided with a water inlet for injecting municipal tap water.

[0082] Preferably, the alkaline liquid supply tank 830 is provided with a detector for detecting the pH value of the alkaline liquid in the alkaline liquid supply tank 830 and a liquid level gauge for displaying the water level of the alkaline liquid in the alkaline liquid supply tank 830.

[0083] Preferably, the alkaline liquid supply tank 830 is provided with a feeding port for feeding alkaline materials to ensure that the pH value of the alkaline liquid in the alkaline liquid supply tank 830 reaches a predetermined value.

[0084] When the test engine is tested using the supersonic engine test bench, the following steps are included:

[0085] S100), installing the test engine 1 and the measuring section

[0086] S110), sequentially passing the measuring section for measuring the engine intake parameter through the first measuring section bracket 410 and the second measuring section bracket 420, and placing the measuring section in the first measuring section bracket 410 and the second measuring section bracket 420;

[0087] S120), installing the front joint 640 and the rear joint 650 to the longitudinal beam 613 according to the suspension position of the test engine 1;

[0088] S130), installing the engine mounting bracket 600 to the movable frame bracket body 210 and then installing the test engine 1 to the front joint 640 and the rear joint 650;

[0089] S140), adjusting the measuring section, connecting one end of the measuring section to the air inlet of the test engine 1, adjusting the positioning mechanism screw 4143 in the measuring section bracket positioning mechanism 414 to make the measuring section coaxial with the engine air inlet, and then sequentially rotating the positioning mechanism locking nut 4142 and the positioning mechanism nut 4141 in the measuring section bracket positioning mechanism 414.

[0090] S200), disassembling the locking device

[0091] Loosen the retaining nut 530, the retaining rod 510 from the back of the mounting seat 160 of the vertical plate, retaining baffle 520, the back of the movable frame body 210 baffle pull out, remove the retaining baffle 520.

[0092] S300), determine the working force sensor error

[0093] S310), industrial computer control servo motor start driving hydraulic loading device, hydraulic loading device drive calibration cylinder work, calibration cylinder piston drive standard force sensor 340 displacement and drive the movable frame body 210 displacement, movable frame body 210 displacement process to the working force sensor 350 exert force;

[0094] S320), hydraulic loading device drive calibration cylinder work continues to standard force sensor 340 exert loading force to the predetermined value after unloading loading force to zero; standard force sensor data acquisition device and working force sensor data acquisition device respectively collect standard force sensor 340 and working force sensor 350 in the process of exerting loading force and unloading loading force output force value and feedback to the industrial computer, the display shows the standard force sensor data acquisition device and working force sensor data acquisition device collected standard force sensor 340 and working force sensor 350 in the process of exerting loading force and unloading loading force output force value;

[0095] S330), according to the display of the standard force sensor data acquisition device and working force sensor data acquisition device collected standard force sensor 340 and working force sensor 350 in the process of exerting loading force and unloading loading force output force value plot standard force sensor 340 and working force sensor 350 characteristic curve; under the same load, the difference between the working force sensor data acquisition device collected working force sensor 350 output force value and the standard force sensor data acquisition device collected standard force sensor 340 output force value is the working force sensor error.

[0096] S400), start the spray system

[0097] S410), respectively start the spray tower circulating pump 811 and the pump used for pumping the alkaline liquid in the alkaline liquid supply pool 830 to the lower layer spray system 845, middle layer spray system 846 and upper layer spray system 847, pump the alkaline liquid in the alkaline liquid supply pool 830 to the first alkaline liquid spray tower 810 and the second alkaline liquid spray tower 820, respectively, and the first spray tower first spray system 806 and the second spray tower second spray system 808 of the spray tower, and the lower layer spray system 845, the middle layer spray system 846 and the upper layer spray system 847.

[0098] S420), respectively start the spray tower first spray system 806 and the spray tower second spray system 808 of the first alkali liquid spray tower 810 and the second alkali liquid spray tower 820, and the lower layer spray system 845, the middle layer spray system 846 and the upper layer spray system 847, and the alkali liquid starts to spray, and keep the spray tower first spray system 806 and the spray tower second spray system 808 of the first alkali liquid spray tower 810 and the second alkali liquid spray tower 820, and the lower layer spray system 845, the middle layer spray system 846 and the upper layer spray system 847 working.

[0099] S500), simulate the engine high-altitude flight environment pressure

[0100] Start the ejector in the exhaust system 700, and extract the gas in the high-altitude simulation cabin 900, so that the pressure in the high-altitude simulation cabin 900 is the same as the environmental pressure at the height of the engine high-altitude flight.

[0101] S600), simulate the supersonic engine intake parameters (for specific simulation methods, see the applicant's prior application: application number: CN201811164305.0, invention name: a supersonic engine test bed intake system or application number: CN201811164305.0, invention name: a supersonic engine test bed intake system or application number: CN201811164303.1, invention name: a supersonic engine test bed).

[0102] S610), adjust the engine intake supply pressure regulating valve and the oxygen supply flow regulating valve according to the total pressure and oxygen content of the first simulation state point, so that the total pressure and oxygen content of the second medium passing through the outlet of the supersonic expansion section of the supersonic nozzle are the same as the total pressure and oxygen content of the intake of the engine at the first simulation state point.

[0103] S620), adjust the alcohol supply flow regulating valve according to the total temperature of the first simulation state point, and start the igniter to ignite the alcohol to make the alcohol burn, and the burned alcohol exchanges heat with the second medium in the first medium channel and the second medium channel, so that the total temperature of the second medium passing through the outlet of the supersonic expansion section of the supersonic nozzle is the same as the total temperature of the intake of the engine at the first simulation state point.

[0104] S630), adjust the engine intake supply pressure regulating valve according to the total pressure of the first simulation state point, so that the total pressure of the second medium passing through the outlet of the supersonic expansion section of the supersonic nozzle is the same as the total pressure of the intake of the engine at the first simulation state point.

[0105] S700), first state point simulation test and measurement of the thrust of the tested engine at the state point

[0106] Adjusting the engine fuel supply flow regulating valve according to the fuel demand of the first simulated state point of the engine, so that the fuel supplied by the fuel supply source is the same as the fuel demand of the first simulated state point of the engine, igniting the engine, and conducting the intake simulation test of the first simulated state point, and the display displays the force value output by the force sensor 350 collected by the force sensor data collection device.

[0107] S800), the Nth state point simulation test and measuring the thrust of the tested engine at the state point

[0108] Adjusting the oxygen supply flow regulating valve, the engine intake supply pressure regulating valve, the alcohol supply flow regulating valve and the engine fuel supply flow regulating valve respectively, so that the total pressure, total temperature and oxygen content of the second medium at the outlet of the supersonic expansion section of the supersonic nozzle are the same as the intake total pressure, total temperature and oxygen content of the Nth simulated state point engine, and the fuel supplied by the fuel supply source is the same as the fuel demand of the Nth simulated state point engine; wherein, N≥2; starting the Nth state point intake simulation test of the engine to the Nth state point intake simulation test and measuring the thrust of the tested engine at the state point according to the method of step S500.

[0109] S900), closing the intake system and the exhaust system of the test bench

[0110] After the engine is extinguished, the engine fuel supply flow regulating valve, the oxygen supply flow regulating valve, the engine intake supply pressure regulating valve and the alcohol supply flow regulating valve are closed, the ejector main active gas supply pressure regulating valve is closed.

[0111] S1000), exhaust gas treatment

[0112] S1010), engine test, the exhaust gas of the engine test bench is discharged from the exhaust system (which can be an exhaust pipeline, an ejector, etc.), and enters the spray tower intake port 802 of the first alkali liquid spray tower 810 and the second alkali liquid spray tower 820 respectively through the exhaust gas treatment system input pipeline 850.

[0113] S1020), the engine test bench exhaust gas entering the spray tower intake port 802 passes through the spray tower first filler layer 805 and the spray tower second filler layer 807 in turn, and is discharged from the spray tower gas outlet 803 through the pipeline from the top of the silencing tower 840 to the inlet silencing piece mounting cavity 841, and the alkali liquid and the engine test bench exhaust gas are degraded and treated when the engine test bench exhaust gas passes through the spray tower first filler layer 805 and the spray tower second filler layer 807.

[0114] S1030), the gas entering the entrance sound-absorbing sheet installation cavity 841 is sprayed again by the entrance sound-absorbing sheet installation cavity 842 after being sound-absorbed and reduced by the staggered air flow channels composed of 3 layers of sound-absorbing sheet assemblies.

[0115] S1040), the gas after being sprayed again is discharged by the top of the outlet sound-absorbing sheet installation cavity 842 of the sound-absorbing tower 840 after being sound-absorbed and reduced by the staggered air flow channels composed of 3 layers of sound-absorbing sheet assemblies.

[0116] S1100), the spraying system is closed

[0117] After the engine test is completed, when the time reaches a predetermined time, preferably 2-4 hours after the test, further preferably 3 hours, the spray tower circulating pump 811, the first spraying system 806 and the spray tower second spraying system 808 are closed, and the valve at the alkaline circulating water conveying port below the alkaline circulating water level of the circulating water pool 830 for conveying the alkaline circulating water is closed.

[0118] After the engine test is completed, when the time reaches a predetermined time, preferably 2-4 hours after the test, further preferably 3 hours, the spray tower circulating pump 811, the pump for pumping the alkaline liquid in the alkaline liquid supply pool 830 to the lower spraying system 845, the middle spraying system 846 and the upper spraying system 847, the first spraying system 806, the spray tower second spraying system 808, the lower spraying system 845, the middle spraying system 846 and the upper spraying system 847 are closed.

[0119] Preferably, after each engine test, tap water is injected through the water injection port of the alkaline liquid supply pool 830 for injecting tap water, and alkaline material is put through the material feeding port of the alkaline liquid supply pool 830 for putting alkaline material, so that the pH value of the alkaline liquid in the alkaline liquid supply pool 830 reaches a predetermined value.

[0120] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0121] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely divergences of the principles and application of the present application and that numerous modifications, changes, substitutions, and alterations can be made thereto without departing from the spirit and scope of the present application, which is defined by the following claims and their equivalents.

Claims

1. A supersonic engine test bed, characterized in that, the supersonic engine test bed comprises an air intake system, an engine thrust measurement stand, an exhaust system, an exhaust treatment system and a high-altitude simulation cabin; the high-altitude simulation cabin is a sealed shell structure, the engine thrust measurement stand is fixedly installed in the high-altitude simulation cabin, and the tested engine is installed on the engine thrust measurement stand; the air intake system is in communication with the tested engine or the exhaust system, one end of the exhaust system is fixedly installed inside the high-altitude simulation cabin through the shell surface of the high-altitude simulation cabin, and the other end is in fixed communication with the exhaust treatment system; the exhaust treatment system comprises a first alkali liquid spray tower, a second alkali liquid spray tower, an alkali liquid supply pool, a silencer tower and an exhaust treatment system input pipeline; the spray tower air inlets of the first alkali liquid spray tower and the second alkali liquid spray tower are in communication with the exhaust treatment system input pipeline, the spray tower air outlets are in communication with the silencer tower through pipelines, one end of a conveying pipeline for conveying alkali liquid to the spray system is in communication with the alkali liquid supply pool, and the other end passes through the alkali liquid inlets of the spray towers and is in communication with the first spray system of the spray tower and the second spray system of the spray tower, respectively; from bottom to top, the silencer tower is fixedly installed with a lower spray system, a middle spray system and an upper spray system in sequence, the lower spray system, the middle spray system and the upper spray system are in communication with the alkali liquid supply pool through pipelines; the first alkali liquid spray tower and the second alkali liquid spray tower are of the same structure, the first alkali liquid spray tower comprises a spray tower body, a spray tower air inlet, a spray tower air outlet, a spray tower alkali liquid inlet, a spray tower first filler layer, a spray tower first spray system, a spray tower second filler layer, a spray tower second spray system, a spray tower liquid level meter, a spray tower circulating pump, a spray tower overflow port, a spray tower blowdown port and a spray tower maintenance port; the spray tower body is a hollow cylindrical structure, the spray tower air inlet, the spray tower alkali liquid inlet, the spray tower overflow port, the spray tower blowdown port and the spray tower maintenance port are all arranged on the side of the spray tower body, and the spray tower air outlet is arranged on the top of the spray tower body; the spray tower circulating pump is arranged outside the spray tower body and is used for pumping out the alkali liquid in the alkali liquid supply pool to the first spray system of the spray tower and the second spray system of the spray tower through the conveying pipeline for conveying alkali liquid to the spray system; the spray tower overflow port is arranged at a position higher than the spray tower air inlet, the spray tower alkali liquid inlet and the spray tower blowdown port, the spray tower blowdown port is in communication with an external wastewater treatment device through a pipeline; from bottom to top, the spray tower first filler layer, the spray tower first spray system, the spray tower second filler layer and the spray tower second spray system are fixedly installed in the spray tower body in sequence along the axis of the spray tower body, and the spray tower liquid level meter is arranged on the side of the spray tower body below the lower part of the spray tower first filler layer and is used for monitoring the water level of the wastewater at the bottom of the spray tower body. The sound attenuation tower comprises an inlet sound attenuation sheet installation cavity and an outlet sound attenuation sheet installation cavity which are communicated at the bottom, an inlet sound attenuation sheet assembly is fixedly installed at the inlet sound attenuation sheet installation cavity, an outlet sound attenuation sheet assembly is fixedly installed at the outlet sound attenuation sheet installation cavity, the spray tower gas outlets of the first and second lye spray towers are communicated with the inlet sound attenuation sheet installation cavity of the sound attenuation tower through pipelines, and the outlet of the outlet sound attenuation sheet installation cavity is communicated with the atmosphere; in the outlet sound attenuation sheet installation cavity, below the outlet sound attenuation sheet assembly, from bottom to top, a lower layer spray system, a middle layer spray system and an upper layer spray system are fixedly installed in sequence, the lower layer spray system, the middle layer spray system and the upper layer spray system are communicated with the alkaline liquid supply pool through pipelines, and a pump for pumping the alkaline liquid in the alkaline liquid supply pool to the lower layer spray system, the middle layer spray system and the upper layer spray system is arranged outside the sound attenuation tower. The inlet sound attenuation sheet assembly and the outlet sound attenuation sheet assembly are the same in structure, the inlet sound attenuation sheet assembly comprises a lower layer sound attenuation sheet assembly, a middle layer sound attenuation sheet assembly and an upper layer sound attenuation sheet assembly which are arranged in sequence from bottom to top; each layer of sound attenuation sheet assembly comprises half-thin sound attenuation sheets, half-thick sound attenuation sheets and thin-thick combined sound attenuation sheets, in each layer of sound attenuation sheet assembly, the half-thin sound attenuation sheets and the half-thick sound attenuation sheets are arranged at both ends and are fixedly connected with both end faces of the inlet sound attenuation sheet installation cavity of the sound attenuation tower, a plurality of thin-thick combined sound attenuation sheets are arranged in the middle of the half-thin sound attenuation sheets and the half-thick sound attenuation sheets, and adjacent sound attenuation sheets form airflow channels. In the lower layer sound attenuation sheet assembly, the arrangement mode of the sound attenuation sheets is half-thin sound attenuation sheet, thin-thick combined sound attenuation sheet, thin-thick combined sound attenuation sheet and half-thick sound attenuation sheet, wherein the thick sound attenuation sheet parts of the thin-thick combined sound attenuation sheets all face the half-thin sound attenuation sheet; in the middle layer sound attenuation sheet assembly, the arrangement mode of the sound attenuation sheets is half-thick sound attenuation sheet, thin-thick combined sound attenuation sheet, thin-thick combined sound attenuation sheet and half-thin sound attenuation sheet, wherein the thick sound attenuation sheet parts of the thin-thick combined sound attenuation sheets all face the half-thin sound attenuation sheet; in the upper layer sound attenuation sheet assembly, the arrangement mode of the sound attenuation sheets is half-thin sound attenuation sheet, thin-thick combined sound attenuation sheet, thin-thick combined sound attenuation sheet and half-thick sound attenuation sheet, wherein the thick sound attenuation sheet parts of the thin-thick combined sound attenuation sheets all face the half-thin sound attenuation sheet. The thin-thick combined sound attenuation sheet is a combined sheet formed by the horizontal fixed connection of the half-thin sound attenuation sheet and the half-thick sound attenuation sheet, in the combined thin-thick combined sound attenuation sheet, the half-thin sound attenuation sheet flat and the half-thick sound attenuation sheet flat are arranged in parallel to form the thin-thick combined sound attenuation sheet flat of the thin-thick combined sound attenuation sheet, and the two half-thin sound attenuation sheet guide cone sheets and the two half-thick sound attenuation sheet guide cone sheets form the two thin-thick combined sound attenuation sheet guide cone sheets of the thin-thick combined sound attenuation sheet.

2. The ultrasonic engine test stand of claim 1, wherein: The air intake system comprises a supply source, a temperature simulation unit and a supersonic nozzle; the supply source comprises a fuel supply source, an oxygen supply source, an engine air supply source, an alcohol supply source and an ejector active airflow supply source.

3. The ultrasonic engine test stand of claim 1, wherein: The engine thrust measuring bench comprises a fixed frame, a movable frame and a loading measuring device; the loading measuring device comprises a spring sheet, a loading mechanism and a working force sensor; the movable frame is suspended on the fixed frame through the spring sheet, the loading mechanism is fixedly installed on the fixed frame, and the working force sensor is connected with the fixed frame and the movable frame at two ends respectively.

4. The ultrasonic engine test stand of claim 3, wherein: The movable frame comprises a movable frame body, a first movable frame spring sheet mounting seat, a movable frame working force sensor mounting seat, a second movable frame spring sheet mounting seat and a movable frame standard force sensor mounting seat; the movable frame standard force sensor mounting seat is fixedly installed on the bottom surface of the front end of the movable frame body along the length direction of the movable frame body; the first movable frame spring sheet mounting seat comprises two first movable frame spring sheet mounting seats which are fixedly installed on the bottom surface of the front end of the movable frame body and are respectively located on the two sides of the movable frame standard force sensor mounting seat; the movable frame working force sensor mounting seat is fixedly installed on the bottom of the movable frame body and is located on the center line along the length direction of the movable frame body; and the second movable frame spring sheet mounting seat comprises two second movable frame spring sheet mounting seats which are respectively fixedly installed on the bottom surface of the rear end of the movable frame body.

5. The test bench for supersonic engine according to claim 4, characterized in that: The fixed frame comprises a base, a front mounting seat, a loading mechanism mounting seat, a first fixed frame spring sheet mounting seat, a fixed frame working force sensor mounting seat, a rear mounting seat and a second fixed frame spring sheet mounting seat; the base is a cuboid structure, the front mounting seat and the rear mounting seat are fixedly installed on the front end and the rear end of the base along the length direction of the base, the rear mounting seat comprises a horizontal plate and a vertical plate, and the horizontal plate and the vertical plate form an "L" shape; the loading mechanism mounting seat is fixedly installed on the front mounting seat, the first fixed frame spring sheet mounting seat comprises two first fixed frame spring sheet mounting seats which are fixedly installed on the front end of the base and are respectively located on the two sides of the front mounting seat; the fixed frame working force sensor mounting seat is fixedly installed on the base and is located on the center line along the length direction of the base; and the second fixed frame spring sheet mounting seat comprises two second fixed frame spring sheet mounting seats which are fixedly installed on the rear end of the base and are respectively located on the two sides of the rear mounting seat.

6. The ultrasonic engine test stand of claim 5, wherein: The loading and measuring device comprises a first spring sheet, a second spring sheet, a loading mechanism, a standard force sensor and a working force sensor; the first spring sheet comprises two first spring sheets, each of which is fixedly connected with a first fixed frame spring sheet mounting seat and a first movable frame spring sheet mounting seat respectively, the second spring sheet comprises two second spring sheets, each of which is fixedly connected with a second fixed frame spring sheet mounting seat and a second movable frame spring sheet mounting seat at two ends respectively, the loading mechanism is fixedly installed on the horizontal plate of the front mounting seat, the standard force sensor is fixedly installed on the baffle at the front end of the movable frame body, the loading mechanism and the standard force sensor are coaxially arranged and are parallel to the center line along the length direction of the base, and the working force sensor is fixedly connected with the fixed frame working force sensor mounting seat and the movable frame working force sensor mounting seat at two ends respectively, and the working force sensor is coaxially arranged with the loading mechanism and the standard force sensor.

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