Supersonic engine test bench thrust measurement exhaust device and use method thereof

Abstract

A supersonic engine test bench thrust measurement exhaust device includes an engine thrust measurement bench, an exhaust system, a silencer, and a high-altitude simulation cabin; the high-altitude simulation cabin is a sealed shell structure, the engine thrust measurement bench is fixedly installed in the high-altitude simulation cabin, and the test engine is installed on the engine thrust measurement bench; one end of the exhaust system passes through the shell surface of the high-altitude simulation cabin and is fixedly installed inside the high-altitude simulation cabin, and the other end is fixedly connected to the silencer. The supersonic engine test bench thrust measurement exhaust device of the present invention has an engine thrust measurement bench that realizes the measurement of engine thrust and has a simple structure. At the same time, a thin and thick combined silencer plate is creatively proposed in the silencer, realizing that a thin silencer plate and a thick silencer plate are respectively set on two sides of an air flow channel. Under the premise of ensuring the silencer capability, the number of silencer plates used is reduced, the floor space is small, the application range is wide, and the cost is also greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of engine testing, in particular to a supersonic engine test bench thrust measurement exhaust device and a use method thereof. Background Art

[0002] Engine testing and measurement technology is a crucial component of solid propulsion technology, and thrust measurement is a key parameter that must be measured during engine testing and measurement. Studying engine thrust requires numerous repeated tests, which are impossible to perform during flight testing. The main reasons are that flight testing is costly, time-consuming, yields little information, is risky, and requires significant manpower. This necessitates engine ground tests. Ground testing involves statically testing a system on the ground under specific conditions and environmental requirements to obtain information describing the system's various performance indicators, thereby addressing key issues in the engine thrust testing process. However, existing technology lacks mature technology for engine thrust testing equipment.

[0003] The primary source of noise pollution in engine test benches and their surroundings comes from aerodynamic noise. This noise source, present only during test bench testing, is generated by high-pressure, high-speed, high-temperature compressed air and fuel gas flowing through metal or other enclosures or being released into the atmosphere, generating noise levels exceeding 130 dB(A). Noise is unwanted sound. The human ear can hear sounds with frequencies between 20 Hz and 20,000 Hz, which are directly perceptible to humans. Noise outside this frequency range is inaudible and a silent killer, making it a target for noise control. Currently, different countries regulate noise control within different sound pressure levels based on their specific environments. According to China's Environmental Protection Law, the permitted noise pressure level for newly built enterprises operating eight hours per day is 85 dB(A), and for one hour per day, 94 dB(A). For engine test benches, where the sound power exceeds 130 dB(A), the duration of the noise is short, and the worksite is located far from towns and residential areas, noise control aims to ensure that noise levels in the test bench workplace meet regulatory standards and minimize noise impacts on the environment outside the test bench.

[0004] As for the method of silencing and reducing the noise generated by the test bench, there is no mature and effective technical means in the prior art. The applicant previously applied for CN203910262U, proposing a muffler, which has a certain effect on the silencing and noise reduction of the test bench. However, the staggered arrangement of the thick sheet components and thin sheet components of the muffler requires a large floor space. On the one hand, when the exhaust flow of the engine test bench is small, in order to ensure the quality of silence, it is still necessary to establish multiple thick sheet components and thin sheet components (each layer of silencer sheet components requires at least 2 thick sheet components of silencers and 2 thin sheet components of silencers, plus a thick sheet component of a half-sheet muffler and a thin sheet component of a half-sheet muffler), which leads to a significant increase in cost; on the other hand, when the floor area of ​​the engine test bench where the silencer equipment is allowed to be installed is small and does not allow the staggered arrangement of thick sheet components and thin sheet components of the muffler as described in the patent application on each layer, removing any silencer sheet will lead to a decrease in the silencer ability. Summary of the Invention

[0005] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide a supersonic engine test bench thrust measurement exhaust device and a method of using the same.

[0006] The technical solution of the present invention is: a supersonic engine test bench thrust measurement exhaust device, comprising an engine thrust measurement bench, an exhaust system, a silencer and a high-altitude simulation cabin; the high-altitude simulation cabin is a sealed shell structure, the engine thrust measurement bench is fixedly installed in the high-altitude simulation cabin, and the test engine is installed on the engine thrust measurement bench; one end of the exhaust system passes through the shell surface of the high-altitude simulation cabin and is fixedly installed inside the high-altitude simulation cabin, and the other end is fixedly connected to the silencer.

[0007] The advantages of the present invention compared with the prior art are:

[0008] 1. The supersonic engine test bench thrust measurement exhaust device of the present invention and its use method, wherein the engine thrust measurement bench realizes the measurement of engine thrust and has a simple structure.

[0009] 2. The supersonic engine test bench thrust measurement exhaust device of the present invention and its use method, wherein the engine thrust measurement bench cleverly suspends the moving frame on the fixed frame through spring sheets and uses a force sensor to measure the engine thrust, is simple and easy to use.

[0010] 3. The supersonic engine test bench thrust measurement exhaust device and its use method of the present invention are provided with a measurement section bracket in the engine thrust measurement bench to ensure that the measurement section used to measure the intake parameters of the test engine is coaxial with the engine, which not only ensures the accuracy of the engine intake simulation, but also improves the accuracy of the engine intake parameter measurement.

[0011] 4. The supersonic engine test bench thrust measurement exhaust device and its use method of the present invention have a large overall rigidity of the dynamic frame in the engine thrust measurement test bench. To ensure the dynamic performance of the test bench, the design rationally distributes the force-bearing elements, adopts the principle of equal structural strength, removes the non-stressed parts of the material, and optimizes the design to reduce the mass of the dynamic frame.

[0012] 5. The supersonic engine test bench thrust measurement exhaust device and its use method of the present invention has a horizontal base provided on its fixed frame in the engine thrust measurement bench to improve the bearing capacity of the entire fixed frame.

[0013] 6. The supersonic engine test bench thrust measurement exhaust device and its use method of the present invention have a locking state set in the engine thrust measurement bench, so that when the engine is not tested or when the engine is installed before testing, the movable frame and the fixed frame remain in a fixed state, thereby extending the service life of the engine thrust measurement bench. At the same time, it avoids the application of irreversible external force to the spring leaf or even damage to the spring leaf when the engine and its related test pieces are installed in the movable frame in its own state (not in the locking state), thereby ensuring the accuracy of the engine thrust measurement bench.

[0014] 7. The supersonic engine test bench thrust measurement exhaust device and its use method of the present invention adopt a gantry-type engine mounting frame in the engine thrust measurement bench to suspend the engine, thereby improving the measurement accuracy of the engine thrust. The front and rear joints are adjustable in position, greatly expanding the application range of the engine mounting frame and solving the problem of setting up one engine mounting frame for each engine in the past.

[0015] 8. The supersonic engine test bench thrust measurement exhaust device and its use method of the present invention employs a standard force sensor in its engine thrust measurement bench to determine the error of the working force sensor and statically calibrate it, thereby generating a set of high-precision known "simulated thrusts" to calibrate the force measurement system. Because it replicates the deformation and stress conditions of the test state, it eliminates most system errors caused by deformation, installation, temperature, constraints, etc. during the test, thereby reducing thrust measurement uncertainty.

[0016] 9. The supersonic engine test bench thrust measurement exhaust device and its use method of the present invention, in which the engine thrust measurement bench is calibrated and the characteristic curve diagram of the standard force sensor and the working force sensor is drawn, and the force value output by the working force sensor is accurately determined by the characteristic curve diagram, thereby avoiding the calibration of the working force sensor for each test, low cost and high efficiency.

[0017] 10. The supersonic engine test bench thrust measurement exhaust device of the present invention and the method of using the same, the silencer device of which creatively proposes a thin and thick combination silencer flat sheet, realizes that thin silencer sheets and thick silencer sheets are respectively set on two sides of an air flow channel, and under the premise of ensuring the silencer capability, the number of silencer sheets used is reduced (according to the prior art, each layer of silencer sheet assembly requires at least 2 thick sheet assemblies of silencers and 2 thin sheet assemblies of silencers, plus a thick sheet assembly of half a silencer and a thin sheet assembly of half a silencer, while each layer of silencer sheet assembly proposed by the utility model is equivalent to only 1 thick sheet assembly of silencer and 1 thin sheet assembly of silencer, plus a thick sheet assembly of half a silencer and a thin sheet assembly of half a silencer), occupies a small area (applicable to large flow test benches as well as small flow engine test benches), has a wide range of applications, and also greatly reduces costs.

[0018] 11. The supersonic engine test bench thrust measurement exhaust device and its use method of the present invention, wherein the silencer device guides the gas entering the variable frequency diffuser cylinder by setting a conical variable frequency diffuser guide cone, so that the gas entering the variable frequency diffuser cylinder is evenly discharged from a plurality of variable frequency diffuser outlet holes, which is convenient for subsequent silencing and improves the silencing effect.

[0019] 12. The supersonic engine test bench thrust measurement exhaust device and its use method of the present invention have a silencer device which is provided with a variable frequency diffuser, and a variable frequency diffuser outlet hole in the form of a through hole on the surface of the variable frequency diffuser. The airflow passes through the variable frequency diffuser outlet hole to shift the noise frequency to a high frequency, and the difficulty of noise control is reduced by using the principle that high frequencies are easier to silence than low frequencies.

[0020] 13. The supersonic engine test bench thrust measurement exhaust device and its use method of the present invention have a muffler device with a guide plate on the muffler plate to guide the gas entering the air flow channel, making the gas flow uniform and further improving the muffler effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the thrust measurement exhaust device of the supersonic engine test bench of the present invention.

[0022] Figure 2 This is a structural front view of the engine thrust measurement bench in the supersonic engine test bench thrust measurement exhaust device of the present invention.

[0023] Figure 3 for Figure 2 Magnified view of part A in the middle.

[0024] Figure 4 for Figure 2 Magnified view of part B in the middle.

[0025] Figure 5 This is a top view of the engine thrust measurement bench structure in the supersonic engine test bench thrust measurement exhaust device of the present invention.

[0026] Figure 6 for Figure 5 Magnified view of middle C.

[0027] Figure 7 The present invention is a schematic structural diagram of a measuring section bracket of an engine thrust measurement bench in a supersonic engine test bench thrust measurement exhaust device.

[0028] Figure 8 for Figure 7 Magnified view of section D in the middle.

[0029] Figure 9 for Figure 7 Magnified view of middle E.

[0030] Figure 10 This is a structural front view of the engine mounting frame of the engine thrust measurement bench in the supersonic engine test bench thrust measurement exhaust device of the present invention.

[0031] Figure 11 The present invention provides a structural side view of an engine mounting frame of an engine thrust measurement bench in a supersonic engine test bench thrust measurement exhaust device.

[0032] Figure 12 The present invention is a schematic structural diagram of an engine mounting top frame of an engine thrust measurement bench in a supersonic engine test bench thrust measurement exhaust device.

[0033] Figure 13 The diagram is a schematic diagram of the principle of calibrating the force sensor of the engine thrust measurement bench in the supersonic engine test bench thrust measurement exhaust device of the present invention.

[0034] Figure 14 This is a structural schematic diagram of the supersonic engine test bench thrust measurement exhaust device of the present invention, which can show the internal structure of the engine test bench silencer of the present invention.

[0035] Figure 15 The present invention is a schematic structural diagram of a three-layer silencer assembly in a specific embodiment of a silencer device in a supersonic engine test bench thrust measurement exhaust device.

[0036] Figure 16 The present invention is a schematic structural diagram of a single-layer silencer assembly of a silencer device in a supersonic engine test bench thrust measurement exhaust device.

[0037] Figure 17The diagram is a structural diagram of a semi-thin silencer plate of a silencer device in a supersonic engine test bench thrust measurement exhaust device according to the present invention.

[0038] Figure 18 The diagram is a structural diagram of a half-thickness silencer plate of a silencer device in a supersonic engine test bench thrust measurement exhaust device according to the present invention.

[0039] Figure 19 The diagram is a structural diagram of a thin-thick combined silencer plate of a silencer device in a supersonic engine test bench thrust measurement exhaust device of the present invention.

[0040] Figure 20 It is a structural schematic diagram of a variable frequency diffuser in one angular direction of a silencer in a supersonic engine test bench thrust measurement exhaust device of the present invention.

[0041] Figure 21 This is a structural schematic diagram of the variable frequency diffuser in another angular direction of the silencer in the supersonic engine test bench thrust measurement exhaust device of the present invention.

[0042] Figure 22 It is a structural schematic diagram of a variable frequency diffuser guide cone in a variable frequency diffuser of a silencer device in a supersonic engine test bench thrust measurement exhaust device of the present invention. DETAILED DESCRIPTION

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0044] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "abutted" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0045] A thrust measurement exhaust device for a supersonic engine test bench includes an engine thrust measurement bench, an exhaust system 700, a silencer 800, and a high-altitude simulation cabin 900; the high-altitude simulation cabin 900 is a sealed shell structure, and its appearance is not limited and can be a rectangular parallelepiped, an ellipsoid, etc.; the engine thrust measurement bench is fixedly installed in the high-altitude simulation cabin 900, and the test engine 1 is installed on the engine thrust measurement bench; one end of the exhaust system 700 passes through the shell surface of the high-altitude simulation cabin 900 and is fixedly installed inside the high-altitude simulation cabin 900, and the other end is fixedly connected to the silencer 800.

[0046] The engine thrust measurement test bench includes a fixed frame 100, a movable frame 200 and a loading measurement device; the loading measurement device includes a spring sheet, a loading mechanism 330 and a working force sensor 350; the movable frame 200 is suspended on the fixed frame 100 by the spring sheet, the loading mechanism 330 is fixedly installed on the fixed frame 100, and the two ends of the working force sensor 350 are respectively connected to the fixed frame 100 and the movable frame 200.

[0047] The fixed frame includes 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 a rectangular parallelepiped structure, along the length direction of the base 110, the front mounting seat 120 and the rear mounting seat 160 are fixedly mounted on the front and rear ends of the base 110 respectively, and the rear mounting seat 160 includes a horizontal plate and a vertical plate, and the horizontal plate and the vertical plate form an "L" shape; the loading mechanism mounting seat 130 is fixedly mounted on the front mounting seat 120, the first fixed frame spring piece mounting seat 140 includes a first right fixed frame spring piece mounting seat 141 and a second right fixed frame spring piece mounting seat 170. A left fixed frame spring piece mounting seat 142, the first right fixed frame spring piece mounting seat 141 and the first left fixed frame spring piece mounting seat 142 are fixedly mounted on the front end of the base 110 and are respectively located on both 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 located on the center 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, the second right fixed frame spring piece mounting seat 171 and the second left fixed frame spring piece mounting seat 172 are fixedly mounted on the rear end of the base 110 and are respectively located on both sides of the rear mounting seat 160.

[0048] The movable frame 200 includes a movable frame body 210, a first movable frame spring sheet mounting seat 220, a movable frame working force sensor mounting seat 230, a second movable frame spring sheet mounting seat 240 and a movable frame standard force sensor mounting seat 250. The movable frame body 210 includes 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 have the same structure, both are rectangular parallelepiped structures and are parallel to the base 110. The center lines of the right movable frame body 211 and the left movable frame body 212 along the length direction are parallel to the center line of the base 110 along the length direction. The right movable frame body 211 and the left movable frame body 212 are symmetrically arranged relative to the center line of the base 110 along the length direction. There are multiple movable frame connecting plates 260, and multiple movable frame connecting plates 260 fix the right movable frame body 211 and the left movable frame body 212 together. Along the length direction of the movable frame body 210, the movable frame standard The force sensor mounting seat 250 is fixedly mounted on the front bottom surface of the movable frame body 210; the first movable frame spring leaf mounting seat 220 includes a first right movable frame spring leaf mounting seat and a first left movable frame spring leaf mounting seat, and the first right movable frame spring leaf mounting seat and the first left movable frame spring leaf mounting seat are respectively fixedly mounted on the front bottom surfaces of the right movable frame body 211 and the left movable frame body 212 and are respectively located on both sides of the movable frame standard force sensor mounting seat 250; the movable frame working force sensor mounting seat 230 is fixedly mounted on the bottom of a certain movable frame connecting plate 260 of the movable frame body 210 and is located on the center line along the length direction of the movable frame body 210; the second movable frame spring leaf mounting seat 240 includes a second right movable frame spring leaf mounting seat and a second left movable frame spring leaf mounting seat, and the second right movable frame spring leaf mounting seat and the second left movable frame spring leaf mounting seat are respectively fixedly mounted on the rear end bottom surfaces of the right movable frame body 211 and the left movable frame body 212.

[0049] The loading and measuring device includes a first spring piece 310, a second spring piece 320, a loading mechanism 330, a standard force sensor 340 and a working force sensor 350; the first spring piece 310 includes a first right spring piece 311 and a first left spring piece 312, the two ends of the first right spring piece 311 are respectively fixedly connected to the first right fixed frame spring piece mounting seat 141 and the first right movable frame spring piece mounting seat, and the two ends of the first left spring piece 312 are respectively fixedly connected to the first left fixed frame spring piece mounting seat 142 and the first left movable frame spring piece mounting seat; the second spring piece 320 includes a second right spring piece 321 and a second left spring piece 322, the two ends of the second right spring piece 321 are respectively fixedly connected to the second right fixed frame spring piece mounting seat 171 and the second right movable frame spring piece mounting seat, and the two ends of the second left spring piece 322 are respectively fixedly connected to the second left fixed frame spring piece mounting seat 172 And it is fixedly connected to the second left movable frame spring sheet mounting seat; the loading mechanism 330 is fixedly mounted on the horizontal plate of the front mounting seat 120, and the standard force sensor 340 is fixedly mounted on the baffle 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 parallel to the center line of the base 110 along the length direction; the two ends of the working force sensor 350 are respectively fixedly connected to 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 is coaxially arranged with the loading mechanism 330 and the standard force sensor 340; the loading mechanism 330 includes a servo motor, a motor power supply, a hydraulic loading device, and a calibration cylinder. The motor power supply is electrically connected to the servo motor, and the servo motor is connected to the hydraulic loading device and the calibration cylinder in turn, and the piston of the calibration cylinder is connected to the standard force sensor.

[0050] The engine thrust measurement rig includes a measuring section bracket for supporting the measuring section, the measuring section bracket includes a first measuring section bracket 410 and a second measuring section bracket 420 arranged coaxially, the first measuring section bracket 410 and the second measuring section bracket 420 having the same structure and both fixedly mounted on the top surface of the dynamic frame body 210; the measuring section bracket includes a measuring section bracket 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 measuring section bracket bracket 411 is fixedly connected to the top surface of the dynamic frame body 210, and the measuring section bracket lower ring 412 and the measuring section bracket upper ring 413 are both semicircular structures, and the measuring section bracket lower ring 412 and the measuring section bracket upper ring 413 are connected to form a circle; the measuring section bracket lower ring 412 and the measuring section bracket bracket 411 are integrally formed; the measuring section bracket positioning mechanism 414 is 3, and has the same structure, which is used to position the measuring section for measuring the intake parameters of the test engine 1, and the 3 measuring The segment bracket positioning mechanism 414 is evenly distributed in the radial direction of the circle formed by connecting the measuring segment bracket lower ring 412 and the measuring segment bracket upper ring 413. Among them, one measuring segment bracket positioning mechanism 414 is set on the top of the measuring segment bracket upper ring 413, and the remaining two measuring segment bracket positioning mechanisms 414 are set on the measuring segment bracket lower ring 412; the measuring segment bracket positioning mechanism 414 includes a positioning mechanism nut 4141, a positioning mechanism locking nut 4142 and a positioning mechanism screw 4143, and the positioning mechanism screw 4144 is provided. 143 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 and placed on the outside of the measuring section bracket lower ring 412 or the measuring section bracket upper ring 413 to abut against the measuring section bracket lower ring 412 or the measuring section bracket upper ring 413, for locking the positioning mechanism screw 4143, the positioning mechanism nut 4141 is sleeved on the positioning mechanism screw 4143 and abuts against the positioning mechanism locking nut 4142;There are two locking devices 415 with the same structure, which are used to fix the lower ring 412 of the measuring section bracket and the upper ring 413 of the measuring section bracket. The two locking devices 415 are set at the connecting ends of the lower ring 412 of the measuring section bracket and the upper ring 413 of the measuring section bracket. The locking devices 415 include an upper locking plate 4151, a lower locking plate 4152, a locking bolt 4153 and a locking nut 4154. The upper locking plate 4151 is fixedly connected to the front end surface of the upper ring 413 of the measuring section bracket. The lower surface of the upper locking plate 4151 overlaps with the lower surface of the measuring section bracket upper ring 413. The lower locking plate 4152 is fixedly connected to the front end surface of the measuring section bracket lower ring 412. The upper surface of the lower locking plate 4152 overlaps with the upper surface of the measuring section bracket lower ring 412. The locking bolt 4153 passes through the lower locking plate 4152 and the upper locking plate 4151 in sequence. The locking nut 4154 cooperates with the locking bolt 4153 and abuts against the upper locking plate 4151.

[0051] The engine thrust measurement test bench includes a locking device, which includes a tightening screw 510, a tightening baffle 520 and a tightening nut 530. The tightening screw 510 passes through the rear end baffle of the dynamic frame body 210, the tightening baffle 520, the vertical plate of the rear mounting seat 160 and the tightening nut 530 in sequence. The tightening nut 530 cooperates with the tightening screw 510, and the tightening baffle 520 and the tightening nut 530 both abut against the vertical plate of the rear mounting seat 160.

[0052] The engine thrust measurement bench includes an engine mounting frame 600, which includes an engine mounting top frame 610, a left column 620 and a right column 630 of the same structure, a front joint 640, a rear joint 650 and a lifting lug 660; the bottom surfaces of the left column 620 and the right column 630 are detachably connected to the movable frame 200; the engine mounting top frame 610 is fixedly connected to the top surfaces of the left column 620 and the right column 630 to form a gantry type, the front joint 640 and the rear joint 650 are detachably mounted on the engine mounting top frame 610, and the lifting lug 660 is fixedly connected to the engine mounting top frame 610. The engine mounting bracket 610 includes a front beam 611, a rear beam 612 and a longitudinal beam 613. The front beam 611 and the rear beam 612 are arranged in parallel and are fixedly connected to the longitudinal beam 613. The rear beam 612 is fixedly connected to one end of the longitudinal beam 613. The front beam 611, the rear beam 612 and the longitudinal beam 613 form a "earth" shape; the longitudinal beam 613 is provided with a mounting hole 614 for mounting a front joint 640 and a rear joint 650; the left column 620 includes a front column 621, a rear column 622 and a column connecting rod 623. The front column 621 and the rear column 622 are arranged in parallel and fixedly connected by a number of column connecting rods 623.

[0053] The engine thrust measurement bench includes a force sensor calibration device, which includes an industrial computer, a display, a standard force sensor data acquisition device and a working force sensor data acquisition device; the industrial computer is electrically connected to the display and the servo motor respectively, the standard force sensor data acquisition device is electrically connected to the standard force sensor and the industrial computer respectively, and the working force sensor data acquisition device is electrically connected to the working force sensor and the industrial computer respectively.

[0054] The exhaust system 700 includes a tail chamber section 710, an ejector low-pressure chamber 720, an ejector convergent section 730, an ejector straight section 740 and an ejector expansion section 750, which are fixedly connected in sequence. The ejector expansion section 750 is fixedly connected to the variable frequency diffuser 820 of the silencer 800; a replaceable small tail chamber is fixedly installed in the tail chamber section 710. The exhaust system 700 is a prior art. For details, please refer to the Chinese invention patent ZL 201610786167.4 obtained by the applicant.

[0055] The silencer 800 includes a tower body 810, a variable frequency diffuser 820 and a silencer plate assembly 830; a top cover 811 is provided on the top of the tower body 810, and a variable frequency diffuser mounting hole 812 for mounting the variable frequency diffuser 820 is opened on one side of the tower body 810; the variable frequency diffuser 820 passes through the variable frequency diffuser mounting hole 812 and is horizontally fixedly installed in the tower body 810; the silencer plate assembly 830 is fixedly installed in the tower body 810. Preferably, the tower body is a reinforced concrete structure.

[0056] The variable frequency diffuser 820 includes a variable frequency diffuser cylinder 821 and a variable frequency diffuser guide cone 823. The variable frequency diffuser cylinder 821 is a hollow circular cylinder. The surface of the cylinder is provided with a plurality of variable frequency diffuser outlet holes 822 for exhausting gas. The plurality of variable frequency diffuser outlet holes 822 are all through holes that penetrate the circular cylinder. The variable frequency diffuser guide cone 823 is a cone. The conical surface of the variable frequency diffuser guide cone 823 is provided inside the circular cylinder. The outer diameter of the bottom of the variable frequency diffuser guide cone 823 is the same as the inner diameter of the circular cylinder. The outer circle of the bottom of the cone 823 is fixedly connected to one end face of the circular cylinder, closing one end of the variable frequency diffuser cylinder 821. The gas discharged from the engine test bench enters from the end face of the open end of the variable frequency diffuser cylinder 821, is guided by the variable frequency diffuser guide cone 823, and is discharged from a number of variable frequency diffuser outlet holes 822. By setting the conical variable frequency diffuser guide cone 823, the gas entering the variable frequency diffuser cylinder 821 is guided, so that the gas entering the variable frequency diffuser cylinder 821 is evenly discharged from a number of variable frequency diffuser outlet holes 822, which is convenient for subsequent silencing and improves the silencing effect.

[0057] The silencer assembly 830 includes a lower silencer assembly 8301, a middle silencer assembly 8302 and an upper silencer assembly 8303 arranged in sequence from bottom to top; each layer of silencer assembly includes a semi-thin silencer 831, a semi-thick silencer 832 and a thin-thick combination silencer 833 arranged at intervals. In each layer of silencer assembly, the semi-thin silencer 831 and the semi-thick silencer 832 are arranged at both ends and fixedly connected to the front and rear end surfaces of the tower body 810. A number of thin-thick combination silencers 833 are arranged between the semi-thin silencer 831 and the semi-thick silencer 832, and the adjacent silencers form an airflow channel; the installation method of each layer of silencer assembly and the connection method with the tower body are existing technologies, and the specific method is basically consistent with the applicant's prior application (CN201420057351.1).

[0058] On the same end side, the types of silencers of two adjacent layers are different, so that the air flow channels formed by adjacent silencer assembly are staggered, thereby improving the silencer ability of the silencer device. In a preferred embodiment of the present application, along the silencer tower from front to back, in the lower silencer assembly 8301, the silencers are arranged in the form of semi-thin silencer 831, thin-thick combination silencer 833, thin-thick combination silencer 833, and semi-thick silencer 832, wherein the thick silencer parts of the thin-thick combination silencer 833 are all facing the semi-thin silencer 831; the middle silencer assembly In 8302, the arrangement of the sound-absorbing sheets is a half-thick sound-absorbing sheet 832, a thin-thick combination sound-absorbing sheet 833, a thin-thick combination sound-absorbing sheet 833, and a half-thin sound-absorbing sheet 831, wherein the thick sound-absorbing sheet portions in the thin-thick combination sound-absorbing sheet 833 are all facing the half-thin sound-absorbing sheet 831; in the upper sound-absorbing sheet assembly 8303, the arrangement of the sound-absorbing sheets is a half-thin sound-absorbing sheet 831, a thin-thick combination sound-absorbing sheet 833, a thin-thick combination sound-absorbing sheet 833, and a half-thick sound-absorbing sheet 832, wherein the thick sound-absorbing sheet portions in the thin-thick combination sound-absorbing sheet 833 are all facing the half-thin sound-absorbing sheet 831.

[0059] The semi-thin silencer 831 includes a semi-thin silencer flat sheet 8311 and two semi-thin silencer guide cones 8312, the two semi-thin silencer guide cones 8312 are fixedly connected to the two ends of the semi-thin silencer flat sheet 8311, preferably, the two semi-thin silencer guide cones 8312 are integrally formed with the semi-thin silencer flat sheet 8311; the surfaces of the semi-thin silencer flat sheet 8311 and the semi-thin silencer guide cone 8312 are both provided with a plurality of silencer micropores 834, the plurality of silencer micropores 834 are all through holes penetrating the surface of the semi-thin silencer flat plate 8311 and the semi-thin silencer guide cone 8312. Among them, the structure of the semi-thin silencer 831 is the existing technology, which is the half-sheet structure of the sheet assembly in the applicant's prior application (application number: CN201420056663.0, invention name: sheet assembly for silencer). By setting the semi-thin silencer guide cone 8312, the gas entering the air flow channel is guided, so that the gas flow is uniform, and the silencer effect is further improved.

[0060] The semi-thick silencer 832 includes a semi-thick silencer flat sheet 8321 and two semi-thick silencer guide cones 8322. The two semi-thick silencer guide cones 8322 are fixedly connected to the two ends of the semi-thick silencer flat sheet 8321. Preferably, the two semi-thick silencer guide cones 8322 are integrally formed with the semi-thick silencer flat sheet 8321. The surfaces of the semi-thick silencer flat sheet 8321 and the semi-thick silencer guide cone 8322 are both provided with a number of silencer micropores 834. 834 are all through holes penetrating the surface of the semi-thick silencer flat plate 8321 and the semi-thick silencer guide cone 8322; wherein, the structure of the semi-thick silencer 832 is the prior art, which is the half-sheet structure of the thin sheet assembly in the applicant's prior application (application number: CN201420056662.6, invention name: thick sheet assembly for silencer); by setting the semi-thick silencer guide cone 8322, the gas entering the air flow channel is guided, so that the gas flow is uniform, and the silencer effect is further improved.

[0061] The thin-thick combination silencer 833 is a combination piece formed by the semi-thin silencer 831 and the semi-thick silencer 832 being fixedly connected in the horizontal plane. In the combined thin-thick combination silencer 833, the semi-thin silencer flat piece 8311 and the semi-thick silencer flat piece 8321 are arranged in parallel to constitute the thin-thick combination silencer flat piece 8331 of the thin-thick combination silencer 833, and the two semi-thin silencer guide cones 8312 and the two semi-thick silencer guide cones 8322 constitute the two thin-thick combination silencer guide cones 8332 of the thin-thick combination silencer 833; by arranging the thin-thick combination silencer guide cone 8332, the gas entering the air flow channel can be diverted, so that the gas flows evenly, thereby further improving the silencer effect.

[0062] The thickness of the semi-thin sound-absorbing sheet 831 is L1, the thickness of the semi-thick sound-absorbing sheet 832 is L2, and the thickness of the thin-thick combined sound-absorbing sheet 833 is L3, wherein L1<L2<L3, and L3=L1+L2.

[0063] Preferably, the diameter of the micropores 834 of the sound-absorbing plate is 0.6 mm to 1 mm, and further preferably, the diameter of the micropores 834 of the sound-absorbing plate is 0.8 mm.

[0064] Preferably, the diameter of the frequency diffuser outlet hole 822 is 40 mm to 80 mm, and further preferably, the diameter of the frequency diffuser outlet hole 822 is 60 mm.

[0065] Preferably, the horizontal cross-section inside the tower body 810 is a square channel, and the wall thickness of the tower body 810 is 0.5 m. Further preferably, the horizontal cross-section inside the tower body 810 is a square channel.

[0066] Preferably, the thickness L1 of the semi-thin sound-absorbing sheet 831 is 80 mm-85 mm, and further preferably, the thickness L1 of the semi-thin sound-absorbing sheet 831 is 82 mm.

[0067] Preferably, the thickness L2 of the semi-thickness sound-absorbing sheet 832 is 195 mm-205 mm, and further preferably, the thickness L2 of the semi-thickness sound-absorbing sheet 832 is 200 mm.

[0068] The method for measuring supersonic engine thrust and performing silencing using the supersonic engine test bench thrust measurement exhaust device comprises the following steps:

[0069] S100), install the test engine 1 and the measurement section

[0070] S110), passing the measuring section for measuring engine intake parameters through the first measuring section bracket 410 and the second measuring section bracket 420 in sequence, and placing the measuring section in the first measuring section bracket 410 and the second measuring section bracket 420;

[0071] S120), installing the front joint 640 and the rear joint 650 on the longitudinal beam 613 according to the suspension position of the test engine 1;

[0072] S130), after the engine mounting frame 600 is mounted on the dynamic frame body 210, the test engine 1 is mounted on the front joint 640 and the rear joint 650;

[0073] S140) Adjust the measuring section, connect one end of the measuring section to the air intake of the test engine 1, adjust the positioning mechanism screw 4143 in the measuring section bracket positioning mechanism 414, make the measuring section coaxial with the engine air intake, and then rotate the positioning mechanism locking nut 4142 and the positioning mechanism nut 4141 in the measuring section bracket positioning mechanism 414 in sequence.

[0074] S200) Disassemble the locking device

[0075] Loosen the fixing nut 530 , pull out the fixing screw 510 from the vertical plate of the rear mounting seat 160 , the fixing baffle 520 , and the baffle at the rear end of the movable frame body 210 in sequence, and then take out the fixing baffle 520 .

[0076] S300), determining the working force sensor error

[0077] S310), the industrial computer controls the servo motor to start and drive the hydraulic loading device to work, the hydraulic loading device drives the calibration cylinder to work, the piston of the calibration cylinder drives the standard force sensor 340 to move, and then drives the movable frame body 210 to move, and during the displacement of the movable frame body 210, force is applied to the working force sensor 350;

[0078] S320), the hydraulic loading device drives the calibration cylinder to continue applying the loading force to the standard force sensor 340 to a predetermined value and then unloading the loading force to zero; the standard force sensor data acquisition device and the working force sensor data acquisition device respectively collect the force values ​​output by the standard force sensor 340 and the working force sensor 350 during the process of applying the loading force and unloading the loading force and feed them back to the industrial computer, and the display displays the force values ​​output by the standard force sensor 340 and the working force sensor 350 during the process of applying the loading force and unloading the loading force collected by the standard force sensor data acquisition device and the working force sensor data acquisition device;

[0079] S330), draw a characteristic curve diagram of the standard force sensor 340 and the working force sensor 350 according to the force values ​​output by the standard force sensor 340 and the working force sensor 350 during the process of applying the loading force and unloading the loading force, which are collected by the standard force sensor data acquisition device and the working force sensor data acquisition device and displayed on the display; under the same loading force, the difference between the force value output by the working force sensor 350 collected by the working force sensor data acquisition device and the force value output by the standard force sensor 340 collected by the standard force sensor data acquisition device is the working force sensor error.

[0080] S400), simulate the engine high-altitude flight environment pressure and muffle the exhaust gas from the exhaust system

[0081] S410), starting the ejector in the exhaust system 700 to extract the gas in the high-altitude simulation cabin 900 so that the pressure in the high-altitude simulation cabin 900 is the same as the ambient pressure at the altitude at which the engine is flying at high altitude;

[0082] S420), the gas discharged from the exhaust system 700 enters from the end face of the open end of the variable frequency diffuser cylinder 821, is guided by the variable frequency diffuser guide cone 823, and is discharged from a number of variable frequency diffuser outlet holes 822. The air flow passes through the dry variable frequency diffuser outlet holes 822 to shift the noise frequency to high frequency, and the difficulty of noise control is reduced by using the principle that high frequency is easier to control than low frequency. The gas discharged from the several variable frequency diffuser outlet holes 822 is silenced and reduced in noise through the staggered air flow channels composed of three layers of silencer plate components, and is discharged from the outlet at the top of the tower body 810.

[0083] S500) Measure the thrust of the engine under test

[0084] The engine is ignited, and after the measuring section detects that the intake parameters of the test engine 1 have reached the working condition, the display shows the force value output by the working force sensor 350 collected by the working force sensor data acquisition device.

[0085] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0086] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A method for measuring supersonic engine thrust and muffler using a supersonic engine test bench thrust measurement exhaust device, characterized in that: The supersonic engine test bench thrust measurement exhaust device includes an engine thrust measurement bench, an exhaust system, a silencer, and a high-altitude simulation cabin. The high-altitude simulation cabin is a sealed shell structure, the engine thrust measurement bench is fixedly installed in the high-altitude simulation cabin, and the test engine is installed on the engine thrust measurement bench. One end of the exhaust system passes through the shell surface of the high-altitude simulation cabin and is fixedly installed inside the high-altitude simulation cabin, and the other end is fixedly connected to the silencer. The engine thrust measurement bench includes a fixed frame, a dynamic frame, and a loading measurement device; the loading measurement device includes a spring sheet, a loading mechanism, and a working force sensor; the dynamic frame is suspended on the fixed frame by the spring sheet, the loading mechanism is fixedly mounted on the fixed frame, and the two ends of the working force sensor are respectively connected to the fixed frame and the dynamic frame; The movable frame includes a movable frame body, a first movable frame spring sheet mounting seat, a movable frame working force sensor mounting seat, a second movable frame spring sheet mounting seat and a movable frame standard force sensor mounting seat; along the length direction of the movable frame body, the movable frame standard force sensor mounting seat is fixedly mounted on the front end bottom surface of the movable frame body; the first movable frame spring sheet mounting seat includes two fixedly mounted on the front end bottom surface of the movable frame body and respectively located on both sides of the movable frame standard force sensor mounting seat; the movable frame working force sensor mounting seat is fixedly mounted on the bottom of the movable frame body and located on the center line along the length direction of the movable frame body; the second movable frame spring sheet mounting seat includes two respectively fixedly mounted on the rear end bottom surface of the movable frame body; The fixed frame includes 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 a rectangular parallelepiped structure, and along the length direction of the base, the front mounting seat and the rear mounting seat are fixedly mounted at the front and rear ends of the base respectively, and the rear mounting seat includes a horizontal plate and a vertical plate, and the horizontal plate and the vertical plate form an "L" shape; the loading mechanism mounting seat is fixedly mounted on the front mounting seat, and the first fixed frame spring piece mounting seat includes two, which are fixedly mounted on the front end of the base and are respectively located on both sides of the front mounting seat; the fixed frame working force sensor mounting seat is fixedly mounted on the base and is located on the center line along the length direction of the base; the second fixed frame spring piece mounting seat includes two, which are fixedly mounted on the rear end of the base and are respectively located on both sides of the rear mounting seat; The loading and measuring device includes a first spring sheet, a second spring sheet, a loading mechanism, a standard force sensor and a working force sensor; the first spring sheet includes two, each of which is fixedly connected to a first fixed frame spring sheet mounting seat and a first movable frame spring sheet mounting seat, and the second spring sheet includes two, and each of the two ends of the second spring sheet is fixedly connected to a second fixed frame spring sheet mounting seat and a second movable frame spring sheet mounting seat; the loading mechanism is fixedly mounted on the transverse plate of the front mounting seat, and the standard force sensor is fixedly mounted on the baffle at the front end of the movable frame body, the loading mechanism and the standard force sensor are coaxially arranged and parallel to the center line of the base along the length direction; the two ends of the working force sensor are fixedly connected to the fixed frame working force sensor mounting seat and the movable frame working force sensor mounting seat, and the working force sensor is coaxially arranged with the loading mechanism and the standard force sensor; The engine test bench silencer device includes a tower body, a variable frequency diffuser and a silencer assembly; a top cover is provided on the top of the tower body, and a variable frequency diffuser mounting hole is provided on one side of the tower body; the variable frequency diffuser is passed through the variable frequency diffuser mounting hole and is fixedly installed horizontally in the tower body; the silencer assembly is fixedly installed in the tower body; The variable frequency diffuser includes a variable frequency diffuser cylinder and a variable frequency diffuser guide cone. The variable frequency diffuser cylinder is a hollow circular cylinder with a plurality of variable frequency diffuser air outlet holes provided on the surface of the cylinder. The plurality of variable frequency diffuser air outlet holes are through holes penetrating the circular cylinder. The variable frequency diffuser guide cone is a conical shape, with a conical surface of the variable frequency diffuser guide cone provided inside the circular cylinder, and the outer circle of the bottom of the variable frequency diffuser guide cone is fixedly connected to one end surface of the circular cylinder. The sound-absorbing plate assembly includes a lower sound-absorbing plate assembly, a middle sound-absorbing plate assembly and an upper sound-absorbing plate assembly which are sequentially arranged from bottom to top; Each layer of silencer assembly includes semi-thin silencers, semi-thick silencers, and thin-thick combination silencers arranged at intervals; Each layer of the sound-absorbing component includes a semi-thin sound-absorbing sheet, a semi-thick sound-absorbing sheet and a thin-thick combination sound-absorbing sheet. The thin-thick combination sound-absorbing sheet is a combination sheet formed by fixing the semi-thin sound-absorbing sheet and the semi-thick sound-absorbing sheet in a horizontal plane. In the combined thin-thick combination sound-absorbing sheet, the semi-thin sound-absorbing sheet flat sheet and the semi-thick sound-absorbing sheet flat sheet are arranged in parallel to form a thin-thick combination sound-absorbing sheet flat sheet of the thin-thick combination sound-absorbing sheet. Two semi-thin sound-absorbing sheet guide cones and two half-thick sound-absorbing sheet guide cones form two thin-thick combination sound-absorbing sheet guide cones of the thin-thick combination sound-absorbing sheet. On the same end side, the air flow channels formed by the adjacent two layers of silencer plate assemblies are arranged in a staggered manner. From the front to the back of the silencer tower, in the lower layer silencer plate assembly, the silencer plates are arranged in a manner of semi-thin silencer plates, thin-thick combination silencer plates, thin-thick combination silencer plates, and semi-thick silencer plates, wherein the thick silencer plate portions in the thin-thick combination silencer plates are all facing the semi-thin silencer plates; in the middle layer silencer plate assembly, the silencer plates are arranged in a manner of semi-thick silencer plates, thin-thick combination silencer plates, thin-thick combination silencer plates, and semi-thin silencer plates, wherein the thick silencer plate portions in the thin-thick combination silencer plates are all facing the semi-thin silencer plates; in the upper layer silencer plate assembly, the silencer plates are arranged in a manner of semi-thin silencer plates, thin-thick combination silencer plates, thin-thick combination silencer plates, and semi-thick silencer plates, wherein the thick silencer plate portions in the thin-thick combination silencer plates are all facing the semi-thin silencer plates; The method for measuring supersonic engine thrust and silencing using a supersonic engine test bench thrust measurement exhaust device comprises the following steps: S100) Install the test engine and measurement section S110), passing the measuring section for measuring engine intake parameters through the first measuring section bracket and the second measuring section bracket in sequence, and placing the measuring section in the first measuring section bracket and the second measuring section bracket; S120), installing the front joint and the rear joint on the engine mounting top frame according to the suspension position of the test engine; S130), after the engine mounting frame is mounted on the dynamic frame body, the test engine is mounted on the front joint and the rear joint; S140), adjusting the measuring section, connecting one end of the measuring section to the air inlet of the engine under test, adjusting the measuring section bracket to make the measuring section coaxial with the engine air inlet, and then positioning the measuring section; S200) Disassemble the locking device Loosen the locking nut, pull out the locking screw from the vertical plate of the rear mounting seat, the locking baffle, and the baffle at the rear end of the movable frame in sequence, and then remove the locking baffle; S300), determining the working force sensor error S310), the industrial computer controls the servo motor to start and drive the hydraulic loading device to work, the hydraulic loading device drives the calibration cylinder to work, the piston of the calibration cylinder drives the standard force sensor to move, and then drives the dynamic frame to move, and during the displacement of the dynamic frame, force is applied to the working force sensor; S320), the hydraulic loading device drives the calibration cylinder to continue applying the loading force to the standard force sensor to a predetermined value and then unloading the loading force to zero; the standard force sensor data acquisition device and the working force sensor data acquisition device respectively collect the force values ​​output by the standard force sensor and the working force sensor during the process of applying the loading force and unloading the loading force and feed them back to the industrial computer, and the display displays the force values ​​output by the standard force sensor and the working force sensor during the process of applying the loading force and unloading the loading force collected by the standard force sensor data acquisition device and the working force sensor data acquisition device; S330), plotting characteristic curves of the standard force sensor and the working force sensor based on the force values ​​output by the standard force sensor and the working force sensor during the process of applying and unloading the loading force, as collected by the standard force sensor data collection device and the working force sensor data collection device and displayed on the display; under the same loading force, the difference between the force value output by the working force sensor collected by the working force sensor data collection device and the force value output by the standard force sensor collected by the standard force sensor data collection device is the working force sensor error; S400), simulate the engine high-altitude flight environment pressure and muffle the exhaust gas from the exhaust system S410), starting the ejector in the exhaust system to extract the gas in the high-altitude simulation cabin so that the pressure in the high-altitude simulation cabin is the same as the ambient pressure at the altitude at which the engine is flying at high altitude; S420), the gas discharged from the exhaust system enters from the end face of one end of the variable frequency diffuser cylinder opening, is guided by the variable frequency diffuser guide cone, and is discharged from the plurality of variable frequency diffuser outlet holes. The gas discharged from the plurality of variable frequency diffuser outlet holes is silenced and reduced in noise by the staggered air flow channels formed by the silencer plate assembly, and is then discharged from the outlet at the top of the tower body; S500) Measure the thrust of the engine under test The engine is ignited, and after the measuring section detects that the intake parameters of the test engine reach the working condition, the display shows the force value output by the working force sensor collected by the working force sensor data acquisition device.

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