CN110793775A

CN110793775A - Supersonic engine test bed and test method thereof

Info

Publication number: CN110793775A
Application number: CN201911209842.7A
Authority: CN
Inventors: 周培好; 许海涛; 王文彬
Original assignee: Beijing Aerospace Sanfa High Tech Co Ltd
Current assignee: Beijing Aerospace Sanfa High Tech Co Ltd
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2020-02-14

Abstract

A supersonic engine test bed comprises an air inlet system, an engine thrust measuring rack, an exhaust system, a tail gas treatment system and a high-altitude simulation cabin; the high-altitude simulation cabin is of a sealed shell structure, the engine thrust measurement rack is fixedly arranged in the high-altitude simulation cabin, and the tested engine is arranged on the engine thrust measurement rack; and the air inlet system is communicated with the tested engine or the exhaust system, one end of the exhaust system penetrates through the surface of the shell of the high-altitude simulation cabin and is fixedly installed in the high-altitude simulation cabin, and the other end of the exhaust system is fixedly communicated with the tail gas treatment system. The supersonic engine test bed disclosed by the invention can be used for realizing the supersonic air inlet state simulation of the supersonic engine during the ground test of the supersonic engine and the engine; meanwhile, the engine thrust measuring bench realizes measurement of the engine thrust, has a simple structure, and realizes treatment of tail gas of an engine test bed, so that gas discharged from an air outlet of the alkaline spray tower meets the national pollutant emission standard.

Description

Supersonic engine test bed and test method thereof

Technical Field

The invention relates to the technical field of engine tests, in particular to a supersonic engine test bed and a test method thereof.

Background

The engine test and test technology is an important component of the solid propulsion technology, an aerial engine needs to be subjected to high-altitude simulation test on the ground before test flight, a group of air inlet parameters including total air inlet pressure, air inlet flow rate, air inlet oxygen content, total air inlet temperature and oil supply quantity of the engine are called as air inlet state points during the engine test, and the performance and the parameters of the engine are recorded or the performance of the engine is checked after the set value and the stability are reached. With the gradual maturity of engines, the application of supersonic engines is gradually wide, on the basis, when the engine is used for supersonic engines of airplanes, particularly unmanned planes and engine ground tests, an engine air inlet system needs to simulate the supersonic air inlet state of the supersonic engines, the existing engine test stand technology has no mature technology for supersonic engine air inlet simulation, and meanwhile, an accurate theoretical judgment method for when the simulated state reaches a stable state is not available, so that the test simulation effect is poor, the test period is long, the cost is high, and the resource waste condition is serious.

Meanwhile, the thrust measurement is an important parameter to be measured in engine tests and tests. To study engine thrust, numerous trial and error tests are required, which are not possible if all are put into flight tests. The main reasons are high flight test cost, long period, small information yield, risk and large manpower consumption. The engine ground test is to perform static test on the system according to specific conditions and environmental requirements on the ground to obtain various performance index information describing the system so as to solve the key problem in the engine thrust test process.

In addition, for the engine test beds of the aerospace engines such as the turbofan engine and the solid-impact engine, the main components of the exhaust gas are carbon dioxide and hydrogen sulfide and contain certain particulate matters, the particulate matters mainly comprise diboron trioxide and magnesium oxide, if the exhaust gas exhausted by the test beds is directly exhausted into the atmosphere, the atmosphere is greatly polluted, acid rain is generated, meanwhile, pollutants such as PM10 and PM2.5 can be formed by the exhausted particulate matters to pollute the atmosphere, the method is not environment-friendly, and in the prior art, no mature and effective method exists for treating the exhaust gas of the engine test beds of the aerospace engines such as the turbofan engine and the solid-impact engine.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the supersonic engine test bed and the test method thereof are provided for overcoming the defects of the prior art.

The technical solution of the invention is as follows: a supersonic engine test bed comprises an air inlet system, an engine thrust measuring rack, an exhaust system, a tail gas treatment system and a high-altitude simulation cabin; the high-altitude simulation cabin is of a sealed shell structure, the engine thrust measurement rack is fixedly arranged in the high-altitude simulation cabin, and the tested engine is arranged on the engine thrust measurement rack; and the air inlet system is communicated with the tested engine or the exhaust system, one end of the exhaust system penetrates through the surface of the shell of the high-altitude simulation cabin and is fixedly installed in the high-altitude simulation cabin, and the other end of the exhaust system is fixedly communicated with the tail gas treatment system.

Compared with the prior art, the invention has the advantages that:

1. according to the supersonic engine test bed and the test method thereof, the Laval type supersonic spray pipe is arranged between the temperature simulation unit and the engine air inlet of the air inlet system, so that when a supersonic engine and an engine ground test are realized, the supersonic air inlet state simulation of the supersonic engine is realized, the air inlet flow and the total air inlet pressure of the engine are simulated through the air inlet supply source of the engine, meanwhile, oxygen is supplemented for the air inlet of the engine through the oxygen supply source, the air inlet temperature of the engine is simulated through the temperature simulation unit, the real simulation of the air inlet of the engine is realized, and the simulation precision is high; an alcohol supply source is arranged, alcohol is ignited by an igniter to generate heat, and the heat exchanges heat with the inlet air of the engine in the temperature simulation unit, so that the inlet air temperature of the engine is adjusted; the fuel supply to the engine is realized through a fuel supply source; through setting up various valves, realize that flow and pressure of relevant supply source are adjustable, and then realize the simulation of multistate point.

2. The supersonic engine test bed and the test method thereof have the advantages that the tested engine is placed in the simulation cabin, the simulation cabin is in a sealed state, air is extracted through the exhaust ejector, the environmental pressure of the engine at different flight heights is simulated, the ejector active airflow supply source provides ejector airflow for the exhaust ejector, and the method is simple; the fuel supply to the engine is effected by a fuel supply.

3. According to the supersonic engine test bed and the test method thereof, the engine thrust measurement bench realizes measurement of the engine thrust and has a simple structure.

4. The supersonic engine test bed and the test method thereof have the advantages that the engine thrust measuring rack skillfully hangs the movable rack on the fixed rack through the spring piece and is simple and easy to operate by assisting the force sensor to measure the thrust of the engine.

5. According to the supersonic engine test bed and the test method thereof, the engine thrust measuring bench is provided with the measuring section bracket to ensure that the measuring section for measuring the air inlet parameter of the tested engine is coaxial with the engine, so that the air inlet simulation precision of the engine is ensured, and the air inlet parameter measuring precision of the engine is improved.

6. In the supersonic engine test bed and the test method thereof, the overall rigidity of the movable frame is higher in the engine thrust measuring rack, stress elements are reasonably distributed on the design in order to ensure the dynamic performance of the test frame, the principle of equal strength of the structure is adopted, the stress-free parts of materials are removed, and the like, so that the mass of the movable frame is reduced.

7. According to the supersonic engine test bed and the test method thereof, the horizontal base is arranged on the fixed frame in the engine thrust measuring rack, so that the bearing capacity of the whole fixed frame is improved.

8. According to the supersonic engine test bed and the test method thereof, the engine thrust measuring rack is provided with the locking state, so that when the engine is in an untested state or is installed before a test, the movable rack and the fixed rack are kept in a fixed state, the service life of the engine thrust measuring rack is prolonged, the situation that irreversible external force is applied to the spring piece or even the spring piece is damaged when the engine and related test pieces of the engine are installed in an own state (the locking state is not used) of the movable rack is avoided, and the precision of the engine thrust measuring rack is ensured.

9. According to the supersonic engine test bed and the test method thereof, the gantry engine mounting rack is adopted in the engine thrust measuring rack, the engine is suspended, the measurement precision of the engine thrust is improved, the positions of the front joint and the rear joint are adjustable, the application range of the engine mounting rack is greatly improved, and the problem that one engine is provided with one engine mounting rack in the prior art is solved.

10. In the engine thrust measuring bench, the standard force sensor is adopted to determine the error of the working force sensor, and static calibration is carried out, so that a group of high-precision known simulated thrust is generated to determine the degree of a force measuring system.

11. According to the supersonic engine test bed and the test method thereof, the characteristic curve graphs of the standard force sensor and the working force sensor are drawn in the engine thrust measurement rack in a calibration mode, the force value output by the working force sensor is used for accurately determining the true value of the force through the characteristic curve graphs, the calibration of the working force sensor in each test is avoided, the cost is low, and the efficiency is high.

12. The supersonic engine test stand and the test method thereof, the tail gas treatment system of the engine test stand, through arranging the closed circulating water tank and 2 sets of alkaline spray stands, realize the treatment of the tail gas of the engine test stand, make the gas discharged from the gas outlet of the alkaline spray tower accord with the national pollutant emission standard, arrange 2 sets of alkaline spray stands connected in parallel, make the tail gas of the engine test stand divide into 2 ways to carry on the alkaline spray, reduce the velocity of flow of the tail gas of the engine test stand through the alkaline spray tower, make the alkaline spray process more sufficient, reduce the work load of each alkaline spray tower at the same time, further fully carry on the alkaline spray.

13. The supersonic speed engine test bed and the test method thereof have the advantages that the tail gas treatment system of the engine test bed creatively arranges the variable frequency diffuser in the closed circulating water pool, the gas accommodating volume in the circulating water pool is larger than the volume of the variable frequency diffuser, so that the tail gas discharged by the engine test bed is buffered for one time in the closed circulating water pool, the flow velocity of the tail gas of the engine test bed is reduced, and the subsequent alkali spraying is fully carried out when the gas enters the alkali spraying tower.

14. According to the supersonic engine test bed and the test method thereof, in the tail gas treatment system of the engine test bed, the cone-shaped variable-frequency diffuser diversion cone is arranged in the variable-frequency diffuser, so that gas entering the variable-frequency diffuser barrel is guided, the gas entering the variable-frequency diffuser barrel is uniformly discharged from the plurality of variable-frequency diffuser gas outlet holes, the gas containing volume in the circulating water pool can be uniformly filled, and the buffering and subsequent alkaline spraying of the gas are facilitated.

15. The supersonic engine test bed and the test method thereof have the advantages that the tail gas treatment system of the engine test bed is creatively provided with 2 layers of spraying systems in each alkaline spraying tower, so that the spraying is more thorough.

16. According to the supersonic engine test bed and the test method thereof, in the tail gas treatment system of the engine test bed, the filler layer filled with the ceramic material is arranged in each layer of spraying system, so that the treatment capacity of the alkaline spraying tower is greatly improved.

17. According to the supersonic engine test bed and the test method thereof, in the tail gas treatment system of the engine test bed, the recycling of alkaline circulating water is realized by arranging the circulating water tank, the waste water treatment equipment and the closed cooling tower, and the test cost is greatly reduced.

Drawings

FIG. 1 is a schematic structural view of a supersonic engine test stand according to the present invention.

FIG. 2 is a front view of the structure of the engine thrust measuring bench in the supersonic engine test bench of the present invention.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Fig. 4 is an enlarged view of a portion B in fig. 2.

FIG. 5 is a top view of the structure of the engine thrust measuring bench in the supersonic engine test bench of the present invention.

Fig. 6 is an enlarged view of the portion C of fig. 5.

FIG. 7 is a schematic structural diagram of a measuring section bracket of an engine thrust measuring bench in the supersonic engine test bench of the present invention.

Fig. 8 is an enlarged view of a portion D in fig. 7.

Fig. 9 is an enlarged view of a portion E of fig. 7.

FIG. 10 is a front view of the engine mount of the engine thrust measuring stand of the supersonic engine test stand according to the present invention.

FIG. 11 is a side view of the engine mount of the engine thrust measurement rig of the supersonic engine test stand of the present invention.

FIG. 12 is a schematic structural diagram of an engine mounting top frame of an engine thrust measuring bench in the supersonic engine test bench of the present invention.

FIG. 13 is a schematic diagram of the calibration of force sensors of an engine thrust measurement rig in the supersonic engine test stand of the present invention.

FIG. 14 is a schematic view of a partial structure of a temperature simulation unit of an air intake system in the supersonic engine test stand according to the present invention.

FIG. 15 is a schematic structural diagram of an exhaust system and an exhaust gas treatment system in the supersonic engine test stand according to the present invention.

FIG. 16 is a schematic structural diagram of a tail gas treatment system in the supersonic engine test stand of the present invention.

Fig. 17 is a schematic structural view showing an internal structure of an exhaust gas treatment system in the supersonic engine test stand according to the present invention.

FIG. 18 is a schematic structural diagram of an alkali liquor spray tower of the tail gas treatment system in the supersonic engine test stand of the present invention.

FIG. 19 is a schematic view of a variable frequency diffuser of the exhaust treatment system at an angle in the supersonic engine test stand of the present invention.

FIG. 20 is a schematic view of a frequency diffuser in the exhaust treatment system at another angular orientation of the supersonic engine test stand of the present invention.

FIG. 21 is a schematic structural diagram of a guide cone of a variable frequency diffuser of an exhaust gas treatment system in the supersonic engine test stand of the present invention.

Detailed Description

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "abutted" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The pressure, total pressure, static pressure, dynamic pressure, temperature, total temperature, static temperature and dynamic temperature related to the invention are the same as those of the prior application (application number: CN201811164303.1, the name of the invention is a supersonic engine test bed) of the applicant, and in addition, the air inlet system of the engine test bed is provided with a temperature sensor and a pressure sensor in the inlet and the outlet of a first medium channel, the inlet and the outlet of a second medium channel, the inlet and the outlet of a supersonic spray pipe and a supersonic spray pipe respectively, wherein the temperature sensor and the pressure sensor are arranged facing the airflow direction and are used for measuring the total pressure and the total temperature of the section of the sensor.

A supersonic engine, especially suitable for the test bed of the supersonic engine with Mach number 1-5, such as the aerospace engine like turbofan engine, solid rush engine, etc., especially suitable for the test bed of the supersonic engine high altitude multiple state point simulation test, wherein, in the supersonic engine high altitude multiple state point, the parameter of each state point includes the total pressure of engine intake air, the air flow rate of intake air, the oxygen composition of intake air, the total temperature of intake air, the oil mass of engine oil supply, air ambient pressure. The supersonic engine test bed comprises an air inlet system, an engine thrust measuring rack, 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, the shape of the high-altitude simulation cabin is not limited, and the high-altitude simulation cabin can be a cuboid, an ellipsoid and the like; the engine thrust measuring rack is fixedly arranged in the high-altitude simulation cabin 900, and the tested engine 1 is arranged on the engine thrust measuring rack; the air inlet system is communicated with the tested engine 1 and/or the exhaust system 700, one end of the exhaust system 700 penetrates through the surface of the shell of the high-altitude simulation cabin 900 and is fixedly installed inside the high-altitude simulation cabin 900, and the other end of the exhaust system 700 is fixedly communicated with the tail gas treatment system 800.

The air intake system includes a supply source, a temperature simulation unit 60, and a supersonic nozzle 401.

The supply sources include a fuel supply source 10, an oxygen supply source 20, an engine intake supply source 30, an alcohol supply source 40 and an eductor active airflow supply source 50.

The temperature simulation unit comprises a pipe body 61 and a shell 62, wherein the pipe body 61 is positioned inside the shell 62, a first medium channel is formed in the pipe body 61, and a second medium channel is formed in a space between the outer wall of the pipe body 61 and the inner wall of the shell 62; when the temperature simulation unit 60 works, a first medium circulates in the first medium channel, a second medium circulates 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 the pipe wall of the pipe body 61, and the outlet of the supersonic nozzle 401 is fixedly communicated with the air suction port of the tested engine 1. The specific structure and the specific connection mode of the temperature simulation unit 60 and the supersonic nozzle 401 are referred to in the prior application of the applicant (application number: CN201811164305.0, the name of the invention: a supersonic engine test bed air inlet system or application number: CN201811164303.1, the name of the invention: a supersonic engine test bed).

The fuel oil supply source 10 is communicated with the tested engine 1 through a pipeline, the oxygen supply source 20 and the engine air inlet supply source 30 are respectively communicated with an inlet of a second medium channel through a pipeline, an outlet of the second medium channel is communicated with an inlet of the straight section 610 such as an inlet of the supersonic nozzle 401 through a pipeline, an outlet of the supersonic expansion section 650 of the supersonic nozzle 401 is communicated with an air inlet of the tested engine through a pipeline, and an air inlet of the tested engine 1 is communicated to provide simulated supersonic engine air inlet flow, inlet Mach number, inlet total pressure and oxygen content for the tested engine 1; the alcohol supply source 40 is communicated with the inlet of the first medium channel through a pipeline after passing through the igniter, the outlet of the first medium channel is communicated with the outside, the igniter ignites alcohol to burn to generate heat, and the heat is exchanged with the second medium in the second medium channel in the temperature simulation unit 60 to adjust the temperature of the second medium in the second medium channel, so that the intake temperature simulation of the engine is realized.

Preferably, the exhaust system 700 of the present application is a tail chamber-combined ejector structure, and includes a tail chamber section 710, an ejector low-pressure chamber 720, an ejector shrinkage section 730, an ejector equal-straight section 740 and an ejector expansion section 750, which are fixedly connected in sequence, wherein the ejector expansion section 750 is fixedly connected with a variable-frequency diffuser 840 of the tail gas treatment system 800; the small replaceable tail room is fixedly installed in the tail room section 710, and the exhaust system 700 is the prior art, which is specifically referred to the patent ZL 201610786167.4 of the applicant obtained the chinese invention. The ejector motive gas flow supply 50 is in communication with an ejector low pressure chamber 720 of the exhaust system 700 via a conduit.

An engine fuel supply flow regulating valve 51 is arranged on a pipeline for communicating the fuel supply source 10 with the tested engine 1, an oxygen supply flow regulating valve 53 is arranged on a pipeline for communicating the oxygen supply source 20 with the inlet of the second medium channel, an engine intake air supply pressure regulating valve 55 is arranged on a pipeline for communicating the engine intake air supply source 30 with the inlet of the second medium channel, an alcohol supply flow regulating valve 56 is arranged on a pipeline for communicating the alcohol supply source 40 with the inlet of the first medium channel, and an ejector active air flow supply pressure regulating valve 58 is arranged on a pipeline for communicating the ejector active air flow supply source 50 with the exhaust system 700, so that parameter adjustment of each supply source is realized, and multi-state point simulation is met.

Preferably, the intake system includes 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 being provided on a pipeline that communicates the fuel supply source 10 with the engine under test 1; the oxygen supply shutoff valve 54 is provided on a line that communicates the oxygen supply source 20 with the inlet of the second medium passage; the alcohol supply shut-off valve 57 is provided on a pipe line that communicates the alcohol supply source 40 with the inlet of the first medium passage. During the use of the intake system, the engine fuel supply shutoff valve 52 is opened before the engine fuel supply flow rate regulating valve 51 is opened, the oxygen supply shutoff valve 54 is opened before the oxygen supply flow rate regulating valve 53 is opened, and the alcohol supply shutoff valve 57 is opened before the alcohol supply flow rate regulating valve 56 is opened; the engine fuel supply shutoff valve 52 is closed after the engine fuel supply flow rate regulating valve 51 is closed, the oxygen supply shutoff valve 54 is closed after the oxygen supply flow rate regulating valve 53 is closed, and the alcohol supply shutoff valve 57 is closed after the alcohol supply flow rate regulating valve 56 is closed, so that the safety of the intake system in a non-experimental state is ensured.

The engine thrust measuring rack comprises a fixed rack 100, a movable rack 200 and a loading measuring device; the loading measuring device comprises a spring piece, a loading mechanism 330 and a working force sensor 350; the movable frame 200 is suspended on the fixed frame 100 through the spring plate, the loading mechanism 330 is fixedly mounted on the fixed frame 100, and two ends of the working force sensor 350 are respectively connected with the fixed frame 100 and the movable frame 200.

The fixed frame comprises a base 110, a front mounting seat 120, a loading mechanism mounting seat 130, a first fixed frame spring piece mounting seat 140, a fixed frame working force sensor mounting seat 150, a rear mounting seat 160 and a second fixed frame spring piece mounting seat 170; the base 110 is of a cuboid structure, the front mounting seat 120 and the rear mounting seat 160 are respectively and fixedly mounted at the front end and the rear end of the base 110 along the length direction of the base 110, the rear mounting seat 160 comprises a transverse plate and a vertical plate, and the transverse plate and the vertical plate form an L shape; the loading mechanism mounting seat 130 is fixedly mounted on the front mounting seat 120, the first fixed frame spring leaf mounting seat 140 includes a first right fixed frame spring leaf mounting seat 141 and a first left fixed frame spring leaf mounting seat 142, and the first right fixed frame spring leaf mounting seat 141 and the first left fixed frame spring leaf mounting seat 142 are fixedly mounted at the front end of the base 110 and are respectively located on two sides of the front mounting seat 120; the fixed frame working force sensor mounting seat 150 is fixedly mounted on the base 110 and is positioned on a central line along the length direction of the base 110; the second fixed frame spring piece mounting seat 170 includes a second right fixed frame spring piece mounting seat 171 and a second left fixed frame spring piece mounting seat 172, and the second right fixed frame spring piece mounting seat 171 and the second left fixed frame spring piece mounting seat 172 are fixedly mounted at the rear end of the base 110 and respectively located at two sides of the rear mounting seat 160.

The movable frame 200 comprises a movable frame body 210, a first movable frame spring piece mounting seat 220, a movable frame working force sensor mounting seat 230, a second movable frame spring piece mounting seat 240 and a movable frame standard force sensor mounting seat 250, wherein the movable frame body 210 comprises a right movable frame body 211, a left movable frame body 212 and a movable frame connecting plate 260, the right movable frame body 211 and the left movable frame body 212 are identical in structure, both of which are cuboid structures and are parallel to the base 110, the central line of the right movable frame body 211 and the left movable frame body 212 in the length direction is parallel to the central line of the base 110 in the length direction, the right movable frame body 211 and the left movable frame body 212 are symmetrically arranged relative to the central line of the base 110 in the length direction, the number of the movable frame connecting plates 260 is multiple, and the right movable frame body 211 and the left movable frame body 212 are fixedly connected by the plurality of the movable frame connecting plates 260; along the length direction of the movable frame body 210, a movable frame standard force sensor mounting seat 250 is fixedly mounted on the bottom surface of the front end of the movable frame body 210; the first moving frame spring piece mounting seat 220 comprises a first right moving frame spring piece mounting seat and a first left moving frame spring piece mounting seat, and the first right moving frame spring piece mounting seat and the first left moving frame spring piece mounting seat are respectively fixedly mounted on the bottom surfaces of the front ends of the right moving frame body 211 and the left moving frame body 212 and are respectively positioned on two sides of the moving frame standard force sensor mounting seat 250; the movable frame working force sensor mounting base 230 is fixedly mounted at the bottom of one movable frame connecting plate 260 of the movable frame body 210 and is located on a central line along the length direction of the movable frame body 210; the second moving frame spring piece mounting seat 240 comprises a second right moving frame spring piece mounting seat and a second left moving frame spring piece mounting seat, and the second right moving frame spring piece mounting seat and the second left moving frame spring piece mounting seat are fixedly mounted on the bottom surfaces of the rear ends of the right moving frame body 211 and the left moving frame body 212 respectively.

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

The engine thrust measuring rack comprises a measuring section bracket for supporting a measuring section, the measuring section bracket comprises a first measuring section bracket 410 and a second measuring section bracket 420 which are coaxially arranged, and the first measuring section bracket 410 and the second measuring section bracket 420 have the same structure and are both fixedly arranged on the top surface of the movable rack body 210; the measuring section bracket comprises a measuring section bracket 411, a measuring section bracket lower ring 412, a measuring section bracket upper ring 413, a measuring section bracket positioning mechanism 414 and a locking device 415; the bottom surface of the measurement section bracket 411 is fixedly connected with the top surface of the movable frame body 210, the measurement section bracket lower ring 412 and the measurement section bracket upper ring 413 are both of a semicircular structure, and the measurement section bracket lower ring 412 and the measurement section bracket upper ring 413 are connected to form a circle; the measuring section bracket lower ring 412 and the measuring section bracket 411 are integrally formed; the number of the measurement section bracket positioning mechanisms 414 is 3, the structure of the measurement section bracket positioning mechanisms is the same, and the measurement sections are used for positioning and measuring the air intake parameters of the tested engine 1; the 3 measuring section bracket positioning mechanisms 414 are uniformly distributed along the radial direction of a circle formed by connecting the measuring section bracket lower ring 412 and the measuring section bracket upper ring 413, wherein one measuring section bracket positioning mechanism 414 is arranged at the top of the measuring section bracket upper ring 413, and the rest 2 measuring section bracket positioning mechanisms 414 are arranged on the measuring section bracket lower ring 412; the measuring section bracket 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 passes through the measuring section bracket lower ring 412 or the measuring section bracket upper ring 413, the positioning mechanism locking nut 4142 is sleeved on the positioning mechanism screw 4143, is arranged on the outer side of the measuring section bracket lower ring 412 or the measuring section bracket upper ring 413 and is abutted against the measuring section bracket lower ring 412 or the measuring section bracket 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 is abutted against the positioning mechanism locking nut 4142; the number of the locking devices 415 is 2, and the structures of the locking devices are the same, and the locking devices 415 are used for fixedly connecting the lower ring 412 of the measurement section bracket and the upper ring 413 of the measurement section bracket, 2 locking devices 415 are arranged at the connecting ends of the lower ring 412 of the measurement section bracket and the upper ring 413 of the measurement 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 attached to the front end surface of the upper ring 413 of the measurement section bracket, the lower surface of the upper locking plate 4151 coincides with the lower surface of the upper ring 413 of the measurement section bracket, the lower locking plate 4152 is fixedly attached to the front end surface of the measuring section bracket lower ring 412, the upper surface of the lower lock plate 4152 coincides with the upper surface of the measuring section bracket lower ring 412, the locking bolt 4153 passes through the lower and upper locking plates 4152 and 4151 in sequence, the lock nut 4154 is engaged with the lock bolt 4153 and abuts against the upper lock plate 4151.

The engine thrust measuring rack comprises a locking device, the locking device comprises a fastening screw rod 510, a fastening baffle 520 and a fastening nut 530, the fastening screw rod 510 sequentially penetrates through a rear end baffle of the movable rack body 210, the fastening baffle 520, a vertical plate and a fastening nut 530 of the rear mounting seat 160, the fastening nut 530 is matched with the fastening screw rod 510, and the fastening baffle 520 and the fastening nut 530 are both abutted to the vertical plate of the rear mounting seat 160.

The engine thrust measuring rack comprises an engine mounting rack 600, wherein the engine mounting rack 600 comprises an engine mounting top rack 610, a left upright column 620 and a right upright column 630 which are identical in structure, a front joint 640, a rear joint 650 and a lifting lug 660; the bottom surfaces of the left upright post 620 and the right upright post 630 are detachably connected with the movable frame 200; the engine mounting top frame 610 is fixedly connected with the top surfaces of the left upright column 620 and the right upright 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 with the engine mounting top frame 610; the engine mounting top frame 610 comprises a front beam 611, a rear beam 612 and a longitudinal beam 613, wherein the front beam 611 and the rear beam 612 are arranged in parallel and are fixedly connected with the longitudinal beam 613, the rear beam 612 is fixedly connected with one end of the longitudinal beam 613, and the front beam 611, the rear beam 612 and the longitudinal beam 613 form a shape like the Chinese character 'tu'; the longitudinal beam 613 is provided with a mounting hole 614 for mounting a front joint 640 and a rear joint 650; the left upright post 620 comprises a front post 621, a rear post 622 and upright post connecting rods 623, wherein the front post 621 and the rear post 622 are arranged in parallel and are fixedly connected through the upright post connecting rods 623.

The engine thrust measurement rack comprises a force sensor calibration device, and the force sensor calibration device comprises an industrial personal computer, a display, a standard force sensor data acquisition device and a working force sensor data acquisition device; the industrial personal computer is respectively electrically connected with the display and the servo motor, the standard force sensor data acquisition device is respectively electrically connected with the standard force sensor and the industrial personal computer, and the working force sensor data acquisition device is respectively electrically connected with the working force sensor and the industrial personal computer.

The tail gas treatment system 800 comprises a first alkali liquor spray tower 810, a second alkali liquor spray tower 820, a circulating water tank 830, a variable frequency diffuser 840, a wastewater treatment device 850 and a closed cooling tower 860.

The circulating water tank 830 is of a closed reinforced concrete structure, a mounting hole for mounting the variable frequency diffuser 840 is formed in one side surface of the circulating water tank 830, the variable frequency diffuser 840 penetrates through the mounting hole and then is horizontally and fixedly mounted in the circulating water tank 830, alkaline circulating water is filled in the circulating water tank 830, and the variable frequency diffuser 840 is located above the alkaline circulating water.

The first alkali liquor spray tower 810 and the second alkali liquor spray tower 820 are identical in structure and fixedly mounted on the upper surface of the circulating water tank 830, and the spray tower air inlets 802 of the first alkali liquor spray tower 810 and the second alkali liquor spray tower 820 are communicated with an exhaust port (not shown in the figure) of the circulating water tank 830, which is located above the alkaline circulating water level and used for exhausting tail gas of the engine test bed exhausted by the variable-frequency diffuser 840, through a pipeline.

The wastewater treatment apparatus 850 is a conventional art, is fixedly installed on the upper surface of the circulation tank 830, and a wastewater inlet (not shown in the figure) of the wastewater treatment equipment 850 is communicated with the spray tower drain 813 of the first alkali liquor spray tower 810 and the second alkali liquor spray tower 820 through pipelines, the water outlet (not shown in the figure) of the wastewater treatment equipment 850 is communicated with the water inlet (not shown in the figure) for introducing purified water above the alkaline circulating water level of the circulating water tank 830 through a pipeline, and sewage discharged from the spray tower drain 813 of the first alkali liquor spray tower 810 and the second alkali liquor spray tower 820 enters the water outlet of the wastewater treatment equipment 850 after being purified by the wastewater treatment equipment 850 and enters the circulating water tank 830 through the water inlet for introducing purified water above the alkaline circulating water level of the circulating water tank 830 through a pipeline. Preferably, a valve is arranged at a water inlet of the circulating water tank 830 above the alkaline circulating water level for introducing clean water, the valve is closed when the tail gas of the engine test bed enters the circulating water tank 830, and the valve is opened when the tail gas of the engine test bed does not exist in the circulating water tank 830 and the wastewater treatment device 850 works.

The closed cooling tower 860 is a conventional one, is fixedly installed on the upper surface of the circulating water bath 830, and a water inlet (not shown in the figure) of the closed cooling tower 860 is communicated with a water outlet (not shown in the figure) of the circulating water tank 830 which is positioned below the alkaline circulating water level and used for leading out alkaline circulating water through a pipeline, a water outlet (not shown) of the closed cooling tower 860 is communicated with a cooling water inlet (not shown) for introducing cooling water above the alkaline circulation water level of the circulation water tank 830 through a pipe, the alkaline circulating water in the circulating water pool 830 enters the water inlet of the closed cooling tower 860 through a pipeline, is cooled by the closed cooling tower 860, is discharged from the water outlet for leading out the alkaline circulating water through a pipeline, enters the circulating water pool 830 from the cooling water inlet for leading in the cooling water above the alkaline circulating water level of the circulating water pool 830. Preferably, a cooling water inlet for introducing cooling water above the alkaline circulation water level and a water outlet for leading out alkaline circulation water below the alkaline circulation water level of the circulation water tank 830 are provided with valves, the valves are closed when tail gas of the engine test bed enters the circulation water tank 830, and the valves are opened when tail gas of the engine test bed does not exist in the circulation water tank 830 and the cooling water inlet of the cooling water works.

Preferably, the circulation water tank 830 is provided with a water injection port for injecting municipal tap water.

Preferably, the circulation water tank 830 is provided with a drain port to be discharged into the sewage treatment system.

Preferably, a detector for detecting the alkalinity and acidity of the alkaline circulating water in the circulating water tank 830, a thermometer for detecting the alkaline circulating water in the circulating water tank 830 and a liquid level meter for displaying the level of the alkaline circulating water in the circulating water tank 830 are arranged in the circulating water tank 830.

Preferably, the circulating water tank 830 is provided with a feed inlet for feeding alkaline materials, so as to ensure that the alkalinity and acidity of the alkaline circulating water in the circulating water tank 830 reaches a predetermined value.

Preferably, the gas containing volume in the circulating water tank 830 is larger than the volume 840 of the variable frequency diffuser, and preferably, the gas containing volume in the circulating water tank 830 is 10 times the volume 840 of the variable frequency diffuser.

The first alkali liquor spraying tower 810 comprises a spraying tower body 801, a spraying tower air inlet 802, a spraying tower air outlet 803, a spraying tower alkali liquor inlet 804, a spraying tower first packing layer 805, a spraying tower first spraying system 806, a spraying tower second packing layer 807, a spraying tower second spraying system 808, a spraying tower liquid level meter 809, a spraying tower circulating pump 811, a spraying tower overflow port 812, a spraying tower drain 813 and a spraying tower maintenance port 814; the spray tower body 801 is of a hollow cylindrical structure, the spray tower air inlet 802, the spray tower alkali liquor inlet 804, the spray tower overflow port 812, the spray tower drain 813 and the spray tower maintenance port 814 are all arranged on the side part of the spray tower body 801, and the spray tower air outlet 803 is arranged on the top of the spray tower body 801; the spray tower inlet 802 is communicated with an exhaust port of the circulating water tank 830 which is positioned above the alkaline circulating water level and used for exhausting tail gas of the engine test bed exhausted by the variable frequency diffuser 840 through a pipeline, the spray tower outlet 803 is communicated with the outside atmosphere, one end of a conveying pipeline for conveying alkaline circulating water to a spray system is communicated with an alkaline circulating water conveying port, which is positioned below the alkaline circulating water level, of the circulating water tank 830, the other end of the conveying pipeline penetrates through the spray tower alkaline liquor inlet 804 and is respectively communicated with a spray tower first spray system 806 and a spray tower second spray system 808, the spray tower circulating pump 811 is arranged outside the spray tower body 801, the basic circulating water pump in the circulating water tank 830 is conveyed to the first spraying system 806 of the spraying tower and the second spraying system 808 of the spraying tower through a conveying pipeline for conveying the basic circulating water to the spraying system; preferably, a valve is arranged at an alkaline circulating water conveying port of the circulating water tank 830, which is located below the alkaline circulating water level and used for conveying alkaline circulating water, and the valve is opened when tail gas of an engine test bed enters the circulating water tank 830, and closed when tail gas of the engine test bed does not exist in the circulating water tank 830; further preferably, the conveying pipeline for conveying the alkaline circulating water to the spraying system is provided with a seal through the spraying tower alkaline input port 804; the arrangement position of the spray tower overflow port 812 is higher than the spray tower air inlet 802, the spray tower alkali liquor input port 804 and the spray tower drain 813, and the spray tower drain 813 is communicated with the wastewater inlet of the wastewater treatment equipment 850 through a pipeline. Along the axis of the spray tower body 801, a first spray tower filler layer 805, a first spray tower spraying system 806, a second spray tower filler layer 807 and a second spray tower spraying system 808 are fixedly installed inside the spray tower body 801 from bottom to top in sequence, and preferably, the fillers in the first spray tower filler layer 805 and the second spray tower filler layer 807 are ceramic fillers. The spray tower liquid level meter is arranged on the side part of the spray tower body 801 and is positioned on the lower part of the first packing layer 805 of the spray tower and used for monitoring the water level of the wastewater at the bottom of the spray tower body 801.

The variable-frequency diffuser 840 comprises a variable-frequency diffuser cylinder 841 and a variable-frequency diffuser diversion cone 843, the variable-frequency diffuser cylinder 841 is a hollow circular cylinder, a plurality of variable-frequency diffuser air outlet holes 842 for discharging gas are formed in the surface of the cylinder, and the variable-frequency diffuser air outlet holes 842 are through holes penetrating through the circular cylinder; the variable frequency diffuser diversion cone 843 is cone-shaped, the cone surface of the variable frequency diffuser diversion cone 843 is arranged in the circular cylinder, the diameter of the excircle at the bottom of the variable frequency diffuser diversion cone 843 is the same as the inner diameter of the circular cylinder, the excircle at the bottom of the variable frequency diffuser diversion cone 843 is fixedly connected with one end surface of the circular cylinder, one end of the variable frequency diffuser cylinder 841 is closed, tail gas exhausted from an engine test bench enters from the end surface of one open end of the variable frequency diffuser cylinder 841, is guided by the variable frequency diffuser diversion cone 843 and is exhausted from a plurality of variable frequency diffuser vent holes 842, and the gas entering the variable frequency diffuser cylinder 841 is guided by the variable frequency diffuser diversion cone 843 in the shape of a cone, so that the gas entering the variable frequency diffuser cylinder 841 is uniformly exhausted from the plurality of variable frequency diffuser vent holes 842 to facilitate subsequent tail gas treatment, the tail gas treatment capacity of the equipment is improved.

When the supersonic engine test bed is used for testing a tested engine, the test bed comprises the following steps:

s100), installing the tested engine 1 and measuring section

S110), sequentially enabling a measuring section for measuring engine air inlet parameters to pass 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;

s120), mounting the front joint 640 and the rear joint 650 to the longitudinal beam 613 according to the suspension position of the engine 1 under test;

s130), mounting the engine mounting frame 600 on the movable frame body 210, and then mounting the tested engine 1 on the front joint 640 and the rear joint 650;

s140) adjusting the measuring section, connecting one end of the measuring section with the air inlet of the tested engine 1, adjusting a positioning mechanism screw 4143 in the measuring section bracket positioning mechanism 414, enabling the measuring section and the engine air inlet to be coaxial, and then sequentially rotating a positioning mechanism locking nut 4142 and a positioning mechanism nut 4141 in the measuring section bracket positioning mechanism 414.

S200), disassembling and locking device

The fastening nut 530 is loosened, the fastening screw 510 is pulled out from the vertical plate of the rear mounting seat 160, the fastening baffle 520 and the baffle at the rear end of the movable frame body 210 in sequence, and then the fastening baffle 520 is taken out.

S300), determining the error of the working force sensor

S310), the industrial personal computer controls the servo motor to start to drive the hydraulic loading device to work, the hydraulic loading device drives the calibration oil cylinder to work, a piston of the calibration oil cylinder drives the standard force sensor 340 to displace so as to drive the movable frame body 210 to displace, and force is applied to the working force sensor 350 in the displacement process of the movable frame body 210;

s320), the hydraulic loading device drives the calibration oil cylinder to work, and the loading force is unloaded to a zero value after the loading force is continuously applied to the standard force sensor 340 to a preset value; the standard force sensor data acquisition device and the working force sensor data acquisition device respectively acquire force values output by the standard force sensor 340 and the working force sensor 350 in the loading force applying and unloading processes and feed back the force values to the industrial personal computer, and the display displays the force values output by the standard force sensor 340 and the working force sensor 350 in the loading force applying and unloading processes, which are acquired by the standard force sensor data acquisition device and the working force sensor data acquisition device;

s330), drawing characteristic curve graphs of the standard force sensor 340 and the working force sensor 350 according to force values output by the standard force sensor 340 and the working force sensor 350 in the process of applying loading force and unloading loading force, wherein the force values are displayed by a display and acquired by the standard force sensor data acquisition device and the working force sensor data acquisition device; under the same loading force, the difference between the force value output by the working force sensor 350 acquired by the working force sensor data acquisition device and the force value output by the standard force sensor 340 acquired by the standard force sensor data acquisition device is the working force sensor error.

S400), starting a spraying system

S410), keeping a valve arranged at a water inlet, which is arranged above the alkaline circulating water level and used for introducing clean water, of the circulating water tank 830, closing valves at a cooling water inlet, which is arranged above the alkaline circulating water level and used for introducing cooling water, and a water outlet, which is arranged below the alkaline circulating water level and used for leading out alkaline circulating water, of the circulating water tank 830, and opening a valve at an alkaline circulating water delivery port, which is arranged below the alkaline circulating water level and used for delivering alkaline circulating water, of the circulating water tank 830.

S420), starting a spray tower circulating pump 811 to pump out the alkaline circulating water in the circulating water tank 830 and convey the alkaline circulating water to a first spray system 806 and a second spray system 808 of the spray tower through a conveying pipeline for conveying the alkaline circulating water to the spray systems, starting the first spray system 806 and the second spray system 808 of the spray tower, starting the alkaline circulating water to spray, and keeping the spray tower circulating pump 811, the first spray system 806 and the second spray system 808 of the spray tower to work.

S500), simulating the high-altitude flight environment pressure of the engine

And starting an ejector in the exhaust system 700, and extracting gas in the high-altitude simulation cabin 900 to enable the pressure of the high-altitude simulation cabin 900 to be the same as the environmental pressure of the engine at the altitude in high-altitude flight.

S600), simulating supersonic engine air inlet parameters (the specific simulation method is shown in the applicant' S prior application: application No.: CN201811164305.0, inventive name: an air intake system or application number of supersonic engine test bed: CN201811164305.0, inventive name: an air intake system or application number of supersonic engine test bed: CN201811164303.1, inventive name: a supersonic engine test bed).

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

S620), adjusting an alcohol supply flow rate adjusting valve according to the total intake temperature of the first simulation state point, starting an igniter, igniting alcohol to combust the alcohol, exchanging heat between the combusted alcohol and a second medium in a first medium channel and a second medium in a second medium channel, and enabling the total temperature of the second medium passing through the supersonic expansion section outlet of the supersonic spray pipe to be the same as the total intake temperature of the engine in the first simulation state point.

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

S700), simulating test of first state point and measuring thrust of tested engine under the state point

And adjusting the engine fuel supply flow regulating valve according to the fuel demand of the first simulation 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 simulation state point of the engine, igniting the engine, performing an air intake simulation test of the first simulation state point, and displaying the force value output by the working force sensor 350, which is acquired by the working force sensor data acquisition device, by the display.

S800), simulation test of the Nth state point and measurement of thrust of the tested engine under the state point

Respectively adjusting an oxygen supply flow regulating valve, an engine air inlet supply pressure regulating valve, an alcohol supply flow regulating valve and an engine fuel supply flow regulating valve to ensure that the total pressure, the total temperature and the oxygen content of a second medium at the outlet of the supersonic expansion section of the supersonic spray pipe are the same as the total intake pressure, the total temperature and the oxygen content of the engine at the Nth simulation state point, and the fuel supplied by a fuel supply source is the same as the fuel demand of the engine at the Nth simulation state point; wherein N is more than or equal to 2; starting an N state point air inlet simulation test of the engine to the state point air inlet simulation test and measuring the thrust measurement of the tested engine at the state point according to the method of the step S500.

S900), closing the air inlet system and the exhaust system of the test bed

And (3) shutting off the fuel supply flow regulating valve, the oxygen supply flow regulating valve, the air inlet supply pressure regulating valve and the alcohol supply flow regulating valve of the engine after the engine is shut down, and shutting off the active air flow supply pressure regulating valve of the ejector.

S1000), tail gas treatment

S1010) exhausting tail gas of the engine test bed from the exhaust system 700, introducing the tail gas into the end face of the open end of the variable-frequency diffuser cylinder 841, guiding the tail gas by the variable-frequency diffuser guiding cone 843, and introducing the tail gas into the first alkali lye spray tower 810 and the spray tower air inlet 802 of the second alkali lye spray tower 820 respectively through an exhaust port which is communicated with the circulating water tank 830 and is positioned above the alkaline circulating water level and used for exhausting the tail gas of the engine test bed exhausted by the variable-frequency diffuser 840 and a pipeline of the spray tower air inlet 802.

S1020), after the tail gas of the engine test bed entering the air inlet 802 of the spray tower sequentially passes through the first packing layer 805 of the spray tower and the second packing layer 807 of the spray tower, the tail gas of the engine test bed is discharged from the air outlet 803 of the spray tower, and when the tail gas of the engine test bed passes through the first packing layer 805 of the spray tower and the second packing layer 807 of the spray tower, alkaline circulating water and the tail gas of the engine test bed are subjected to degradation treatment.

S1100), closing the spraying system

After the engine test is finished and the time reaches the preset time, preferably 2-4 hours, and more preferably 3 hours after the test is finished, the spray tower circulating pump 811 is closed, and the valve arranged at the alkaline circulating water delivery port for delivering alkaline circulating water below the alkaline circulating water level of the circulating water tank 830 is closed after the first spray system 806 and the spray tower second spray system 808 are closed.

S1200), wastewater treatment

S1210), keeping a valve which is arranged above an alkaline circulating water level and used for introducing cooling water and a valve which is arranged below the alkaline circulating water level and used for guiding out alkaline circulating water, and a valve which is arranged at an alkaline circulating water delivery port of the circulating water tank 830 and used for delivering alkaline circulating water, closed, opening a valve which is arranged at a water inlet of the circulating water tank 830 and used for introducing purified water and a spray tower drain 813, starting the wastewater treatment equipment 850, the sewage in the first alkali liquor spray tower 810 and the second alkali liquor spray tower 820 is discharged through a spray tower drain 813, enters the wastewater treatment equipment 850 after purification treatment, enters a water outlet of the wastewater treatment equipment 850, enters a water inlet for introducing purified water above an alkali circulating water level of the circulating water tank 830 through a pipeline, and then flows into the circulating water tank 830.

S1220), after the spray tower liquid level meter 809 displays that no sewage exists in the first alkali liquor spray tower 810 and the second alkali liquor spray tower 820, closing the wastewater treatment equipment 850, and then respectively closing a valve arranged at a water inlet for introducing clean water above an alkali circulating water level of the circulating water tank 830 and a spray tower sewage outlet 813.

S1300), cooling alkaline circulating water

Keeping a valve arranged at a water inlet for introducing clean water above an alkaline circulating water level of the circulating water tank 830 and a valve arranged at an alkaline circulating water delivery port for delivering alkaline circulating water below the alkaline circulating water level of the circulating water tank 830 closed, opening a cooling water inlet for introducing cooling water above the alkaline circulating water level and a valve arranged at a water outlet for leading out alkaline circulating water below the alkaline circulating water level, starting the closed cooling tower 860, allowing the alkaline circulating water in the circulating water tank 830 to enter the closed cooling tower 860 through the water outlet for leading out alkaline circulating water below the alkaline circulating water level after cooling, and allowing the alkaline circulating water to enter the circulating water tank 830 through the cooling water inlet for introducing cooling water above the alkaline circulating water level until a thermometer for detecting the alkaline circulating water in the circulating water tank 830 displays that the temperature of the alkaline circulating water in the circulating water tank 830 is not higher At a predetermined value, preferably, the predetermined value is 30 ℃.

Preferably, after each engine test, alkaline materials are fed through a feeding port for feeding alkaline materials, which is arranged in the circulating water tank 830, so that the pH value of alkaline circulating water in the circulating water tank 830 reaches a predetermined value.

Preferably, when the level of the alkaline circulating water in the circulating water tank 830 is lower than a predetermined value, tap water is injected through a water injection port provided in the circulating water tank 830 and used for injecting municipal tap water, and the predetermined value is preferably 2/3 of the depth of the circulating water tank 830.

Preferably, the alkaline circulating water in the circulating water tank 830 is discharged into the sewage treatment system through a discharge port of the circulating water tank 830, which is provided to discharge into the sewage treatment system, for a predetermined period, and preferably, the predetermined period is 3 months.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A supersonic engine test bed is characterized by comprising an air inlet system, an engine thrust measuring rack, an exhaust system, a tail gas treatment system and a high-altitude simulation cabin; the high-altitude simulation cabin is of a sealed shell structure, the engine thrust measurement rack is fixedly arranged in the high-altitude simulation cabin, and the tested engine is arranged on the engine thrust measurement rack; and the air inlet system is communicated with the tested engine or the exhaust system, one end of the exhaust system penetrates through the surface of the shell of the high-altitude simulation cabin and is fixedly installed in the high-altitude simulation cabin, and the other end of the exhaust system is fixedly communicated with the tail gas treatment system.

2. A supersonic engine test stand according to claim 1, characterized in that: the air inlet system comprises a supply source, a temperature simulation unit and a supersonic speed spray pipe; the supply sources include a fuel supply source, an oxygen supply source, an engine intake supply source, an alcohol supply source, and an eductor active airflow supply source.

3. A supersonic engine test stand according to claim 1, characterized in that: the engine thrust measuring rack comprises a fixed rack, a movable rack and a loading measuring device; the loading measuring device comprises a spring piece, a loading mechanism and a working force sensor; the movable frame is hung on the fixed frame through the spring piece, the loading mechanism is fixedly installed on the fixed frame, and two ends of the working force sensor are respectively connected with the fixed frame and the movable frame.

4. A supersonic engine test stand according to claim 3, characterized in that: the movable frame comprises a movable frame body, a first movable frame spring piece mounting seat, a movable frame working force sensor mounting seat, a second movable frame spring piece mounting seat and a movable frame standard force sensor mounting seat; the movable frame standard force sensor mounting seat is fixedly mounted 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 piece mounting seat comprises 2 fixed mounting seats which are fixedly mounted on the bottom surface of the front end of the movable frame body and are respectively positioned on two sides of the movable frame standard force sensor mounting seat; the movable frame working force sensor mounting seat is fixedly mounted at the bottom of the movable frame body and is positioned on a central line along the length direction of the movable frame body; the second movable frame spring piece mounting seat comprises 2 spring pieces which are respectively fixedly mounted on the bottom surface of the rear end of the movable frame body.

5. A supersonic engine test stand 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 piece mounting seat, a fixed frame working force sensor mounting seat, a rear mounting seat and a second fixed frame spring piece mounting seat; the base is of a cuboid structure, the front mounting seat and the rear mounting seat are fixedly mounted at the front end and the rear end of the base respectively along the length direction of the base, the rear mounting seat comprises a transverse plate and a vertical plate, and the transverse plate and the vertical plate form an L shape; the loading mechanism mounting seats are fixedly mounted on the front mounting seat, the number of the first fixing frame spring piece mounting seats is 2, and the first fixing frame spring piece mounting seats are fixedly mounted at the front end of the base and are respectively positioned on two sides of the front mounting seat; the fixed frame working force sensor mounting seat is fixedly arranged on the base and is positioned on a central line along the length direction of the base; the second fixed frame spring piece mounting seat comprises 2 spring pieces which are fixedly mounted at the rear end of the base and are respectively positioned on two sides of the rear mounting seat.

6. A supersonic engine test stand according to claim 5, characterized in that: the loading measuring device comprises a first spring piece, a second spring piece, a loading mechanism, a standard force sensor and a working force sensor; the number of the first spring pieces is 2, each first spring piece is fixedly connected with a first fixed frame spring piece mounting seat and a first movable frame spring piece mounting seat, the number of the second spring pieces is 2, and two ends of each second spring piece are fixedly connected with a second fixed frame spring piece mounting seat and a second movable frame spring piece mounting seat respectively; the loading mechanism is fixedly arranged on a transverse plate of the front mounting seat, the standard force sensor is fixedly arranged on a baffle plate at the front end of the movable frame body, and the loading mechanism and the standard force sensor are coaxially arranged and are parallel to the central line of the base along the length direction; the two ends of the working force sensor are respectively and fixedly connected with the fixed frame working force sensor mounting seat and the movable frame working force sensor mounting seat, and the working force sensor, the loading mechanism and the standard force sensor are coaxially arranged.

7. The supersonic engine test stand of claim 1, an engine test stand tail gas treatment system, comprising a first lye spray tower, a second lye spray tower, a circulating water tank, a variable frequency diffuser, a wastewater treatment facility and a closed cooling tower;

one side surface of the circulating water pool is provided with a mounting hole for mounting a variable frequency diffuser, the variable frequency diffuser is horizontally and fixedly mounted in the circulating water pool after penetrating through the mounting hole, alkaline circulating water is filled in the circulating water pool, and the variable frequency diffuser is positioned above the alkaline circulating water;

the first alkali liquor spray tower and the second alkali liquor spray tower are identical in structure and are fixedly arranged on the upper surface of the circulating water tank, and air inlets of the spray towers of the first alkali liquor spray tower and the second alkali liquor spray tower are communicated with an exhaust port, located above an alkaline circulating water level, of the circulating water tank through a pipeline and used for exhausting tail gas of an engine test bed exhausted by the variable-frequency diffuser;

the waste water treatment equipment is fixedly arranged on the upper surface of the circulating water tank, a waste water inlet of the waste water treatment equipment is communicated with the drain outlets of the spray towers of the first alkali liquor spray tower and the second alkali liquor spray tower through pipelines, a water outlet of the waste water treatment equipment is communicated with a water inlet, positioned above the alkaline circulating water level, of the circulating water tank and used for introducing purified water through a pipeline, and a valve is arranged at a water inlet, positioned above the alkaline circulating water level, of the circulating water tank and used for introducing purified water;

closed cooling tower fixed mounting is at circulating water tank's upper surface, and the water inlet of closed cooling tower passes through the pipeline and is used for deriving the delivery port intercommunication of alkaline circulating water with the circulating water pond below being located alkaline circulating water level, the delivery port of closed cooling tower passes through the pipeline and the circulating water pond be located the cooling water inlet intercommunication that is used for introducing the cooling water of alkaline circulating water level top, the cooling water inlet department that is used for introducing the cooling water and the delivery port that is used for deriving alkaline circulating water that is located alkaline circulating water level below of circulating water pond that is located alkaline circulating water level top all are provided with the valve.

8. The supersonic engine test stand of claim 7, the first lye spray tower comprising a spray tower body, a spray tower inlet, a spray tower outlet, a spray tower lye 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 level gauge, a spray tower circulating pump, a spray tower overflow, a spray tower drain and a spray tower maintenance port; the spray tower body is of a hollow cylindrical structure, a spray tower air inlet, a spray tower alkali liquor inlet, a spray tower overflow port, a spray tower drain outlet and a spray tower maintenance port are arranged on the side part of the spray tower body, and a spray tower air outlet is arranged on the top of the spray tower body; the spraying tower circulating pump is arranged outside the tower body of the spraying tower and is used for pumping out the alkaline circulating water in the circulating water tank and conveying the alkaline circulating water to the first spraying system of the spraying tower and the second spraying system of the spraying tower through the conveying pipeline for conveying the alkaline circulating water to the spraying system; a valve is arranged at an alkaline circulating water conveying port of the circulating water tank, which is positioned below the alkaline circulating water level and used for conveying alkaline circulating water, the arrangement position of an overflow port of the spray tower is higher than that of an air inlet of the spray tower, an alkaline liquor inlet of the spray tower and a drain outlet of the spray tower are arranged, and the drain outlet of the spray tower is communicated with a wastewater inlet of wastewater treatment equipment through a pipeline; along the axis of the spray tower body, a first packing layer of the spray tower, a first spraying system of the spray tower, a second packing layer of the spray tower and a second spraying system of the spray tower are sequentially and fixedly installed inside the spray tower body from bottom to top, and a liquid level meter of the spray tower is arranged on the lower portion of the first packing layer of the spray tower on the side portion of the spray tower body and used for monitoring the water level of wastewater at the bottom of the spray tower body.

9. The supersonic engine test stand of claim 7, an engine test stand tail gas treatment system, the variable frequency diffuser comprising a variable frequency diffuser cylinder and a variable frequency diffuser flow guiding cone, the variable frequency diffuser cylinder being a hollow circular cylinder, the surface of the cylinder being provided with a plurality of variable frequency diffuser gas outlet holes for discharging gas, the plurality of variable frequency diffuser gas outlet holes being through holes penetrating the circular cylinder; the frequency conversion diffuser water conservancy diversion awl is the cone type, and the conical surface of frequency conversion diffuser water conservancy diversion awl sets up inside circular cylinder, and the bottom excircle diameter of frequency conversion diffuser water conservancy diversion awl is the same with circular cylinder's internal diameter, and the bottom excircle and a circular cylinder terminal surface fixed connection of frequency conversion diffuser water conservancy diversion awl will frequency conversion diffuser cylinder one end seal.

10. A method of testing an engine under test using the supersonic engine test stand of any one of claims 1 to 9, comprising the steps of:

s100), installing the tested engine and measuring section

S110), sequentially enabling a measuring section for measuring air inlet parameters of the engine to pass through a first measuring section bracket and a second measuring section bracket, and placing the measuring section in the first measuring section bracket and the second measuring section bracket;

s120), mounting the front joint and the rear joint on an engine mounting top frame according to the suspension position of the tested engine;

s130), mounting the engine to be tested on the front joint and the rear joint after mounting the engine mounting frame on the movable frame body;

s140), adjusting the measuring section, namely, after one end of the measuring section is connected with an air inlet of the tested engine, adjusting a bracket of the measuring section to enable the measuring section and the air inlet of the engine to be coaxial and then positioning the measuring section;

s200), disassembling and locking device

Loosening the fastening nut, pulling out the fastening screw from the vertical plate of the rear mounting seat, fastening the baffle plate and the baffle plate at the rear end of the movable frame body in sequence, and taking out the fastening baffle plate;

s300), determining the error of the working force sensor

S310), the industrial personal computer controls the servo motor to start to drive the hydraulic loading device to work, the hydraulic loading device drives the calibration oil cylinder to work, a piston of the calibration oil cylinder drives the standard force sensor to displace so as to drive the movable frame body to displace, and force is applied to the working force sensor in the process that the movable frame body displaces;

s320), the hydraulic loading device drives the calibration oil cylinder to work, and after loading force is continuously applied to the standard force sensor to a preset value, the loading force is unloaded to a zero value; the standard force sensor data acquisition device and the working force sensor data acquisition device respectively acquire force values output by the standard force sensor and the working force sensor in the loading force applying and unloading processes and feed the force values back to the industrial personal computer, and the display displays the force values output by the standard force sensor and the working force sensor in the loading force applying and unloading processes, wherein the force values are acquired by the standard force sensor data acquisition device and the working force sensor data acquisition device;

s330), drawing characteristic curve graphs of the standard force sensor and the working force sensor according to force values output by the standard force sensor and the working force sensor in the loading force applying and unloading processes, wherein the standard force sensor and the working force sensor are displayed by a display and acquired by the standard force sensor data acquisition device and the working force sensor data acquisition device; under the same loading force, the difference between the force value output by the working force sensor acquired by the working force sensor data acquisition device and the force value output by the standard force sensor acquired by the standard force sensor data acquisition device is the working force sensor error;

s400), starting a spraying system

S410), keeping a valve arranged at a water inlet, which is arranged above an alkaline circulating water level and used for introducing clean water, of the circulating water tank, closing valves at a cooling water inlet, which is arranged above the alkaline circulating water level and used for introducing cooling water, and a water outlet, which is arranged below the alkaline circulating water level and used for leading out alkaline circulating water, and opening a valve at an alkaline circulating water delivery port, which is arranged below the alkaline circulating water level and used for delivering alkaline circulating water, of the circulating water tank;

s420), starting a circulating pump of the spray tower to pump out alkaline circulating water in a circulating water tank and conveying the alkaline circulating water to a first spray system of the spray tower and a second spray system of the spray tower through a conveying pipeline for conveying the alkaline circulating water to the spray system, starting the first spray system and the second spray system of the spray tower, starting the alkaline circulating water to spray, and keeping the circulating pump of the spray tower, the first spray system and the second spray system of the spray tower to work;

s500), simulating the high-altitude flight environment pressure of the engine

Starting an ejector in an exhaust system, and extracting gas in the high-altitude simulation cabin to enable the pressure in the high-altitude simulation cabin to be the same as the environmental pressure of the engine at the altitude in high-altitude flight;

s600), simulating supersonic engine air inlet parameters

S610) adjusting an engine intake air supply pressure adjusting valve and an oxygen supply flow adjusting valve according to the intake total pressure and the oxygen content of the simulated state point, so that the total pressure and the oxygen content of the second medium passing through the supersonic speed expansion section outlet of the supersonic speed spray pipe are the same as the intake total pressure and the oxygen content of the engine of the simulated state point;

s620), adjusting an alcohol supply flow regulating valve according to the total intake temperature of the simulation state point, starting an igniter, igniting alcohol to combust the alcohol, exchanging heat between the combusted alcohol and a second medium in a first medium channel and a second medium in a second medium channel, and enabling the total temperature of the second medium passing through an outlet of a supersonic expansion section of the supersonic spray pipe to be the same as the total intake temperature of an engine in the simulation state point;

s630), adjusting an engine intake air supply pressure adjusting valve according to the intake total pressure of the simulation state point, so that the total pressure of the second medium passing through the supersonic expansion section outlet of the supersonic nozzle is the same as the intake total pressure of the engine at the simulation state point;

s700), state point simulation test and measurement of thrust of tested engine under state point

Adjusting an engine fuel supply flow regulating valve according to the fuel demand of the engine simulation state point to ensure that the fuel supplied by a fuel supply source is the same as the fuel demand of the engine simulation state point, igniting the engine, carrying out an air intake simulation test of the simulation state point, and displaying the force value output by the working force sensor acquired by the working force sensor data acquisition device by a display;

Respectively adjusting an oxygen supply flow regulating valve, an engine air inlet supply pressure regulating valve, an alcohol supply flow regulating valve and an engine fuel supply flow regulating valve to ensure that the total pressure, the total temperature and the oxygen content of a second medium at the outlet of the supersonic expansion section of the supersonic spray pipe are the same as the total intake pressure, the total temperature and the oxygen content of the engine at the Nth simulation state point, and the fuel supplied by a fuel supply source is the same as the fuel demand of the engine at the Nth simulation state point; wherein N is more than or equal to 2; starting an air inlet simulation test of the Nth state point of the engine to the air inlet simulation test of the state point and measuring the thrust measurement of the tested engine at the state point according to the method in the step S500;

s900), closing the air inlet system and the exhaust system of the test bed

The engine is shut down, the fuel supply flow regulating valve and the oxygen supply flow regulating valve of the engine are closed, and the active airflow supply pressure regulating valve of the ejector is closed after the air inlet supply pressure regulating valve and the alcohol supply flow regulating valve of the engine are closed;

s1000), tail gas treatment

S1010) performing engine tests, wherein tail gas of an engine test bed is discharged from an exhaust system, enters from the end face of one open end of a cylinder body of a variable-frequency diffuser, is guided by a guide cone of the variable-frequency diffuser, is discharged from a plurality of air outlet holes of the variable-frequency diffuser, and then respectively enters a first alkali liquor spray tower and a spray tower air inlet of a second alkali liquor spray tower through pipelines which are communicated with a circulating water pool and are positioned above an alkaline circulating water level and used for discharging the tail gas of the engine test bed discharged by the variable-frequency diffuser and a spray tower air inlet;

s1020), after the tail gas of the engine test bed entering the gas inlet of the spray tower sequentially passes through the first packing layer of the spray tower and the second packing layer of the spray tower, the tail gas of the engine test bed is discharged from the gas outlet of the spray tower, and when the tail gas of the engine test bed passes through the first packing layer of the spray tower and the second packing layer of the spray tower, alkaline circulating water and the tail gas of the engine test bed are subjected to degradation treatment;

s1100), closing the spraying system

After the engine test is finished and the time reaches the preset time, closing a circulating pump of the spray tower, and closing a valve at an alkaline circulating water conveying port for conveying alkaline circulating water, which is arranged below an alkaline circulating water level of a circulating water tank, after the first spray system and the second spray system of the spray tower are closed;

s1200), wastewater treatment

S1210), keeping a valve which is positioned above an alkaline circulating water level and used for introducing cooling water, a valve which is positioned below the alkaline circulating water level and used for leading out alkaline circulating water, and a valve which is arranged at an alkaline circulating water delivery port of a circulating water tank and used for delivering alkaline circulating water and is positioned below the alkaline circulating water level and used for delivering alkaline circulating water to be closed, opening the valve which is arranged at the water inlet of the circulating water tank and used for introducing purified water and a spray tower drain outlet, starting a wastewater treatment device, discharging sewage in a first alkaline liquid spray tower and a second alkaline liquid spray tower through the spray tower drain outlet, entering the wastewater treatment device for purification treatment, entering a water outlet of the wastewater treatment device through a pipeline, entering a water inlet of the circulating water tank and used for introducing purified water and positioned above the alkaline circulating water level, and then flowing into the circulating water;

s1220), after the spraying tower liquid level meter displays that no sewage exists in the first alkali liquor spraying tower and the second alkali liquor spraying tower, closing the wastewater treatment equipment, and respectively closing a valve arranged at a water inlet for introducing clean water and a spraying tower sewage outlet which are arranged above an alkaline circulating water level of the circulating water tank;

s1300), cooling alkaline circulating water

Keeping a valve arranged at a water inlet for introducing clean water above the alkaline circulating water level of the circulating water tank and a valve arranged at an alkaline circulating water delivery port for delivering alkaline circulating water below the alkaline circulating water level of the circulating water tank closed, opening valves at a cooling water inlet positioned above the alkaline circulating water level and used for introducing cooling water and a water outlet positioned below the alkaline circulating water level and used for leading out alkaline circulating water, starting the closed cooling tower, and the temperature of the alkaline circulating water in the circulating water tank is not higher than a preset value as shown by a thermometer which is positioned above the alkaline circulating water level and used for detecting the alkaline circulating water in the circulating water tank.