A test device for the visualized flexible deformation expansion section of a two-dimensional rectangular nozzle

Abstract

The present invention discloses a binary rectangular nozzle visualized flexible deformation expansion section test device, comprising a nozzle test section, a transition section, a connection section, a rectification section and an air intake section which are connected in sequence; the nozzle test section comprises a nozzle mounting frame and a nozzle main body, the nozzle main body comprises an upper panel, a lower panel, a left optical glass plate, and a right optical glass plate connected and surrounded, a glass baffle is provided on the outer side of the optical glass plate and against the optical glass plate, the glass baffle has a through opening as an observation window; a pressure measuring connector is installed on the upper panel; an elastic wall plate installation opening is provided on the lower panel and an elastic wall plate is installed, a cover plate is installed on the lower side of the lower panel, a cavity is formed between the cover plate and the elastic wall plate, and an air guide hole connected to the cavity is provided on the cover plate; a pressure measuring connector, a total pressure measuring device and a temperature measuring connector are installed on the connection section. The present invention can observe and record the influence of the expansion section wall ablation movement and vibration on the internal flow field of the nozzle during the operation of the nozzle.

Description

Technical Field

[0001] The invention belongs to the field of aerospace experimental technology, and in particular relates to a binary rectangular nozzle visualized flexible deformation expansion section test device. Background Art

[0002] As one of the key components of the engine, the nozzle is widely used in the fields of scramjet engines, solid rocket engines, liquid rocket engines, and supersonic wind tunnel systems. Its core function is to efficiently convert the internal energy and pressure potential energy of high-temperature and high-pressure combustion products into kinetic energy. This process constitutes the key link of rocket engine energy conversion, plays a decisive role in the practical performance of the engine, and is directly related to the engine's thrust output, specific impulse and other key performance indicators. The rocket engine nozzle has the following three main functions: First, through the precise design and control of the nozzle throat and outlet area, the mass flow rate of the exhaust gas is adjusted, and according to the law of conservation of mass and the ideal gas state equation, the pressure in the combustion chamber is precisely controlled to ensure the stability and efficiency of the combustion process and prevent abnormal conditions such as combustion instability and backfire; second, with the help of the unique structural characteristics of the Laval nozzle that first converges and then expands, based on the one-dimensional isentropic flow theory, the gas flow rate passing through it reaches a supersonic state, generating a considerable thrust increment, improving the thrust performance of the engine, and meeting the power requirements of the engine in different flight stages; third, by using the nozzle vector control technology, the precise control of the engine's flight attitude is achieved by changing the jet direction of the nozzle.

[0003] As a key component of the solid rocket engine nozzle, the expansion section has an extremely harsh working environment. On the one hand, the expansion section needs to withstand the severe ablation and scouring of high-temperature and high-pressure gas for a long time. During the operation of the engine, the gas temperature can reach thousands of degrees Celsius. Such extreme high temperature makes the material of the expansion section face severe tests, which not only easily leads to softening and deformation of the material, but also may cause phase change and chemical reaction of the material, thereby reducing the structural strength and stability of the expansion section. At the same time, the high-pressure gas impacts the inner wall of the expansion section at an extremely high speed. This strong scouring force will cause serious wear and erosion on the surface of the expansion section, making the wall thickness of the expansion section gradually thinner, and even local damage may occur. On the other hand, the expansion section also needs to withstand complex mechanical loads. During the launch and flight of the rocket, the huge thrust generated by the engine will be transmitted to the expansion section through the nozzle, which makes the expansion section bear huge axial force, radial force and bending moment and other mechanical loads. The effect of these mechanical loads will cause the expansion section to deform, vibrate or even break, seriously affecting the normal operation of the nozzle and the flight safety of the rocket. In view of the harsh working environment of the expansion section and the need to further reduce weight to improve engine performance, the current structural design of the expansion section of the nozzle usually presents the characteristics of large size and thin wall, or adopts a flexible variable structure with special materials. Due to its unique material properties, geometric structure characteristics and high-temperature working environment, it will produce complex vibration response characteristics during use, and wall ablation movement or wall vibration may occur during operation, which will affect the aerodynamic vibration response deformation of the expansion section wall plate and the flow field in the expansion section, and finally affect the overall performance of the nozzle. However, there is no report on the fluid-solid coupling experimental device specifically for studying the vibration response of the expansion section of the nozzle. Therefore, it is necessary to design a binary rectangular nozzle visual flexible deformation expansion section test device to observe and record the influence of the expansion section wall ablation movement and vibration on the internal flow field of the nozzle during the operation of the nozzle, so as to provide a reference for the future research on high-performance lightweight nozzles. Summary of the invention

[0004] In order to solve the problem that there is currently no fluid-solid coupling experimental device specifically for studying the vibration response of the nozzle expansion section, the present invention provides a binary rectangular nozzle visualized flexible deformation expansion section test device, which can observe and record the influence of the expansion section wall ablation movement and vibration on the internal flow field of the nozzle during the operation of the nozzle.

[0005] The binary rectangular nozzle visualized flexible deformation expansion section test device of the present invention comprises a nozzle test section, a transition section, a connection section, a rectification section and an air intake section which are sequentially connected;

[0006] The nozzle test section includes a nozzle mounting frame connected to the transition section and a nozzle main body connected to the nozzle mounting frame. The nozzle mounting frame has a rectangular flow channel connected to the transition section. The nozzle main body includes an upper panel, a lower panel, a left optical glass plate, and a right optical glass plate. A left glass baffle is provided on the outer side of the left optical glass plate and abuts against the left optical glass plate. A right glass baffle is provided on the outer side of the right optical glass plate and abuts against the right optical glass plate. Both the left glass baffle and the right glass baffle have through openings as observation windows. The upper panel is provided with a plurality of A pressure measuring connector for connecting the nozzle body to a pressure sensor; an elastic wall panel mounting opening is provided on the lower panel, an elastic wall panel is installed in the elastic wall panel mounting opening, the upper surface of the elastic wall panel is flush with the upper surface of the lower panel, a cover plate is installed on the lower side of the lower panel to close the elastic wall panel mounting opening, a cavity is formed between the cover plate and the elastic wall plate, and an air guide hole connected to the cavity is provided on the cover plate; a connecting section pressure measuring connector for connecting the pressure sensor, a total pressure measuring device and a connecting section temperature measuring connector for connecting the temperature sensor are installed on the connecting section.

[0007] Furthermore, four mounting rods are evenly distributed on the nozzle mounting frame around the rectangular flow channel of the nozzle mounting frame, two on the upper side and two on the lower side; the nozzle main body also includes a support, two upper mounting plates and two lower mounting plates, the support includes a square sleeve with an end plate at one end, a rectangular through hole consistent with the outlet of the rectangular flow channel is opened on the end plate, the open end of the sleeve is sleeved and fixed on the outer peripheral wall of the rectangular flow channel of the nozzle mounting frame, the upper panel and the lower panel are respectively fixed on the upper hole edge and the lower hole edge of the through hole, the two upper mounting plates and the two lower mounting plates are all installed on the end plates, the two upper mounting plates clamp the upper panel, and the lower end surfaces of the two upper mounting plates are flush with the lower surface of the upper panel. The two lower mounting plates clamp the lower panel, the upper end surfaces of the two lower mounting plates are flush with the upper surface of the lower panel, the upper parts of the two upper mounting plates are respectively fixed on the two upper mounting rods, and the lower parts of the two lower mounting plates are respectively fixed on the two lower mounting rods; the left optical glass plate is installed between the two mounting rods on the same side, and the right optical glass plate is installed between the two mounting rods on the same side; the left glass baffle is installed on the two mounting rods on the same side, and the right glass baffle is installed on the two mounting rods on the same side. The observation windows on the left glass baffle and the right glass baffle are respectively opened on the end surfaces of the left glass baffle and the right glass baffle away from the nozzle mounting frame, forming a C shape, which is convenient for camera shooting. In this way, the overall structure is stable and reliable.

[0008] Furthermore, the nozzle body also includes a rectangular ring-shaped elastic wall plate installation frame, the elastic wall plate includes an upper plate and a lower plate glued and fixed to the upper plate, the upper plate is embedded in the ring hole of the elastic wall plate installation frame, the lower plate supports the elastic wall plate installation frame, and the size of the lower plate is consistent with the size of the elastic wall plate installation frame; the elastic wall plate installation opening on the lower panel is a step hole with a circle of step surface inside; the elastic wall plate installation frame is embedded in the elastic wall plate installation opening and fixed, the step surface supports and fixes the lower plate; the upper surface of the elastic wall plate installation frame is flush with the upper surface of the elastic wall plate. In this way, the installation stability of the elastic wall plate can be improved.

[0009] Further, a sealing groove is respectively provided on the outer side surface of each upper mounting plate, the lower mounting plate and the outer wall of the sleeve on both sides, the sealing grooves on the upper mounting plate and the lower mounting plate on the same side are connected through the sealing groove on the sleeve on the same side, a sealing strip is placed in the sealing groove, the left optical glass plate is sealed with an upper mounting plate, a lower mounting plate and the outer wall of the sleeve on the same side through the sealing strip, and the right optical glass plate is sealed with an upper mounting plate, a lower mounting plate and the outer wall of the sleeve on the same side through the sealing strip;

[0010] An upper sealing ring groove is provided on a circle of stepped surface of the installation opening of the elastic wall plate, a sealing ring is placed in the upper sealing ring groove, and the lower plate of the elastic wall plate and the stepped surface are sealed by the sealing ring;

[0011] A lower sealing ring groove is provided on the lower surface of the lower panel around the installation opening of the elastic wall plate, a sealing ring is placed in the lower sealing ring groove, and the lower panel and the cover plate are sealed by the sealing ring, so that no air leakage can be ensured.

[0012] Furthermore, one end of the air inlet section is used to connect to the air supply system, and the other end is connected to one end of the rectifying section through a flange, the other end of the rectifying section is connected to one end of the connecting section through a flange, the other end of the connecting section is connected to one end of the transition section through a flange, and the other end of the transition section is connected to the nozzle test section through a flange; a transition section fixing frame is installed on the transition section, a connecting section fixing frame is installed on the connecting section, and a rectifying section front fixing frame and a rectifying section rear fixing frame are installed on the rectifying section. In this way, the installation is convenient and the connection and fixation are reliable.

[0013] Furthermore, a porous medium plate is installed in the rectifying section, so that the airflow can be ensured to be orderly.

[0014] Furthermore, the upper panel is provided with four vertically penetrating pressure measuring holes, and the nozzle body pressure measuring connector is threadedly connected to the pressure measuring holes; the connecting section is provided with two penetrating pressure measuring holes and one penetrating temperature measuring hole, and the connecting section pressure measuring connector is threadedly connected to one of the pressure measuring holes, the total pressure measuring device is installed on the other pressure measuring hole, and the connecting section temperature measuring connector is threadedly connected to the temperature measuring hole. In this way, the sensor installation is convenient, and the flow changes of the internal flow field can be recorded by the pressure sensor, so as to obtain accurate test data.

[0015] Furthermore, the left optical glass plate and the right optical glass plate are quartz glass plates, the elastic wall plate is made of rubber, the support platform, the upper panel, the lower panel, the upper mounting plate, the lower mounting plate, the mounting rod, the left glass baffle, the right glass baffle, and the cover are all made of aluminum alloy, and the connecting section, the transition section, the rectifying section, and the air intake section are all made of stainless steel. In this way, the materials are easy to obtain and the cost is low.

[0016] The present invention also provides a test method for the above-mentioned binary rectangular nozzle visualized flexible deformation expansion section test device, comprising the following steps:

[0017] 1. Install the experimental device and sensors, connect the data acquisition device, and check whether the sensors and data acquisition device are connected normally;

[0018] 2. Set up the optical path of the Schlieren system, turn on the camera and aim it at the observation window to start recording, and at the same time turn on the data acquisition device to record data;

[0019] 3. Turn on the external vacuum pump to adjust the pressure in the cavity;

[0020] 4. Start the experiment, open the pneumatic valve, input high-pressure gas into the gas supply system, and the gas expands in the experimental device to generate thrust;

[0021] 5. Close the pneumatic valve, check the images recorded by the camera and the data collected by the sensor, process and analyze the data, and the experiment ends.

[0022] Beneficial effects: The binary rectangular nozzle visualized flexible deformation expansion section test device of the present invention can simulate the working state of the binary nozzle. After installing the pressure sensor and the temperature sensor, it can measure the pressure distribution on the nozzle wall and measure the temperature data to obtain the flow characteristics of the nozzle wall. It can also collect the total pressure data of the nozzle inlet, and can use the schlieren instrument to capture the nozzle flow field wave system through the optical glass plate; by setting a cavity structure on the lower panel of the nozzle test section and sealing it with an elastic wall plate and a cover plate, during the test, the elastic wall plate can reflect nonlinear deformation vibration due to the cavity below it, which is different from the rigid wall that cannot reflect deformation vibration due to the lack of a cavity structure in the past, thereby simulating the flow field flow in the real working environment of the flexible nozzle under stress vibration, and can provide an experimental basis for the study of the stress vibration characteristics of the flexible expansion section nozzle; the nozzle test section of the visualized flexible deformation expansion section nozzle test device of the present invention is easy to disassemble and assemble, and the equipment can be configured according to the experimental needs to realize multiple groups of experiments with different expansion ratios, and the experimental operation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the experimental device of the present invention;

[0024] Figure 2It is a partial structural schematic diagram of the nozzle test section of the experimental device of the present invention;

[0025] Figure 3 It is a schematic diagram of the axial section of the structure of the experimental device of the present invention;

[0026] Figure 4 It is a schematic diagram of the planing of the nozzle test section of the experimental device of the present invention;

[0027] Figure 5 It is a schematic diagram of the planing of the connection section of the experimental device of the present invention;

[0028] In the figure, 1, nozzle test section; 11, nozzle mounting frame; 111, mounting rod; 12, nozzle main body; 121, support platform; 122, upper panel; 123, lower panel; 1231, upper sealing ring groove; 1232, lower sealing ring groove; 124, left optical glass plate; 125, right optical glass plate; 126, elastic wall plate; 1261, upper plate; 1262, lower plate; 127, elastic wall plate mounting frame; 128, upper mounting plate; 129, lower mounting plate Mounting plate; 130, left glass baffle; 131, cover plate; 1311 air guide hole; 132, nozzle main body pressure measuring connector; 2, transition section; 21, transition section fixing frame; 3, connecting section; 31, total pressure measuring device; 32, connecting section pressure measuring connector; 33, connecting section temperature measuring connector; 34, connecting section fixing frame; 35, pressure measuring boss; 4, rectifying section; 41, porous medium plate; 42, rectifying section front fixing frame; 43, rectifying section rear fixing frame; 5, air intake section. DETAILED DESCRIPTION

[0029] The present invention will now be further described in detail by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the embodiments.

[0030] like Figure 1 , Figure 3As shown, the present invention is a binary rectangular nozzle visualized flexible deformation expansion section test device, including a nozzle test section 1, a transition section 2, a connection section 3, a rectification section 4 and an air intake section 5 which are connected in sequence, and the materials of the connection section 3, the transition section 2, the rectification section 4 and the air intake section 5 are all stainless steel. One end of the air intake section 5 is used to connect to the gas supply system to provide high-pressure and high-flow gas, and the other end is connected to one end of the rectification section 4 through a flange, and the other end of the rectification section 4 is connected to one end of the connection section 3 through a flange, and the other end of the connection section 3 is connected to one end of the transition section 2 through a flange, and the other end of the transition section 2 is connected to the nozzle test section 1 through a flange, and the flanges are tightly matched, and a sealing ring is provided inside to ensure the sealing. The transition section 2 is a pipe section whose internal channel is transformed from a circular channel to a square channel, which is used to change the cross-sectional shape of the gas flow and transition the circular cross section to a square cross section. A transition section fixing frame 21 is installed on the transition section 2, a connecting section fixing frame 34 is installed on the connecting section 3, and a straightening section front fixing frame 42 and a straightening section rear fixing frame 43 are installed on the straightening section 4; a porous medium plate 41 is installed in the straightening section 4 and is installed at the intersection of the straightening section 4 and the connecting section 3.

[0031] like Figure 2 , Figure 4As shown, the nozzle test section 1 includes a nozzle mounting frame 11 connected to the transition section 2 and a nozzle main body 12 connected to the nozzle mounting frame 11, the nozzle mounting frame 11 has a rectangular flow channel connected to the transition section 2, the nozzle main body 12 is located at the outlet end of the rectangular flow channel, and includes an upper panel 122, a lower panel 123, a left optical glass plate 124, and a right optical glass plate 125 connected and surrounded, the upper panel 122 and the lower panel 123 are both made of aluminum alloy, and the left optical glass plate 124 and the right optical glass plate 125 are both quartz glass plates. Specifically, four aluminum alloy mounting rods 111 are evenly distributed around the rectangular flow channel of the nozzle mounting frame 11 on the nozzle mounting frame 11, two on the top and two on the bottom; the nozzle main body 12 also includes a support 121, two upper mounting plates 128 and two lower mounting plates 129, all of which are made of aluminum alloy. The support 121 includes a square sleeve with an end plate at one end, and a rectangular through hole consistent with the outlet of the rectangular flow channel is opened on the end plate. The open end of the sleeve is sleeved on the outer peripheral wall of the rectangular flow channel of the nozzle mounting frame 11 and fixed by screws. For example, a plurality of through holes are opened on the sleeve, and corresponding screw holes are opened on the outer peripheral wall of the rectangular flow channel of the nozzle mounting frame 11. Screws are used to pass through the through holes and screw into the screw holes for fastening. It is common to use screws to fix. Standard technology; the upper panel 122 and the lower panel 123 are welded on the upper hole edge and the lower hole edge of the through hole respectively, the two upper mounting plates 128 and the two lower mounting plates 129 are welded on the end plates, the two upper mounting plates 128 clamp the upper panel 122 and are integrally formed, the lower end surfaces of the two upper mounting plates 128 are flush with the lower surface of the upper panel 122, the two lower mounting plates 129 clamp the lower panel 123 and are integrally formed, the upper end surfaces of the two lower mounting plates 129 are flush with the upper surface of the lower panel 123, the upper parts of the two upper mounting plates 128 are fixed to the two upper mounting rods 111 by screws respectively, and the lower parts of the two lower mounting plates 129 are fixed to the two lower mounting rods 111 by screws respectively.

[0032] The left optical glass plate 124 is installed between the two mounting rods 111 on the same side, and the right optical glass plate 125 is installed between the two mounting rods 111 on the same side. A sealing groove is respectively provided on the outer side surface of each upper mounting plate 128, lower mounting plate 129 and the outer wall of the sleeve on both sides. The sealing grooves on the upper mounting plate 128 and lower mounting plate 129 on the same side are connected through the sealing groove on the sleeve on the same side. A sealing strip is placed in the sealing groove and fixed by vaseline ointment. The left optical glass plate 124 is sealed with an upper mounting plate 128, a lower mounting plate 129 and the outer wall of the sleeve on the same side through the sealing strip, and the right optical glass plate 125 is sealed with an upper mounting plate 128, a lower mounting plate 129 and the outer wall of the sleeve on the same side through the sealing strip.

[0033] There is also an aluminum alloy left glass baffle 130 on the outside of the left optical glass plate 124. The left glass baffle 130 is installed on the two mounting rods 111 on the same side by screws. The left glass baffle 130 and an upper mounting plate 128 and a lower mounting plate 129 on the same side clamp the left optical glass plate 124. There is also an aluminum alloy right glass baffle on the outside of the right optical glass plate 125. The right glass baffle is installed on the two mounting rods 111 on the same side by screws. The right glass baffle and an upper mounting plate 128 and a lower mounting plate 129 on the same side clamp the right optical glass plate 125. Both the left glass baffle 130 and the right glass baffle have through openings as observation windows. The observation windows on the left glass baffle 130 and the right glass baffle open at the end faces of the left glass baffle 130 and the right glass baffle away from the nozzle mounting frame 11, respectively, and are C-shaped.

[0034] A row of 4 vertically penetrating pressure measuring holes are provided on the upper panel 122 along the center line of the upper panel 122. The pressure measuring holes are equally spaced. The pressure measuring holes are threaded holes. The pressure measuring holes are threadedly connected to the nozzle main body pressure measuring connector 132. The nozzle main body pressure measuring connector 132 can be threadedly connected to a pressure sensor. The pressure sensor installed here can measure the pressure inside the nozzle main body 12. Figure 5 As shown, a small plane is cut out on the upper surface of the connecting section 3 and a pressure measuring hole is provided. The pressure measuring hole is a threaded hole, and the pressure measuring hole is threadedly connected to the connecting section pressure measuring connector 32. The connecting section pressure measuring connector 32 can be threadedly connected to a pressure sensor. A pressure measuring boss 35 is also provided on the same side. The pressure measuring boss 35 is integrally formed with the connecting section 3. The pressure measuring boss 35 is also provided with a pressure measuring hole. A total pressure measuring device 31 is connected to the pressure measuring hole by bolts. A pressure sensor can be threadedly connected to the total pressure measuring device 31 to measure the total intake pressure and the total inlet pressure. A temperature measuring hole is provided on the lower surface of the connecting section 3. The temperature measuring hole is also a threaded hole. The temperature measuring hole is threadedly connected to the connecting section temperature measuring connector 33. The connecting section temperature measuring connector 33 can be threadedly connected to a temperature sensor. The pressure sensor and temperature sensor installed here can measure the pressure and temperature in the connecting section 3 respectively.

[0035] The nozzle main body 12 also includes a rectangular ring-shaped elastic wall panel mounting frame 127, and the ring hole is also rectangular; a rubber elastic wall panel 126 is installed in the ring hole, and the elastic wall panel 126 includes an upper plate 1261 and a lower plate 1262 glued and fixed to the upper plate 1261 by ENIENT rubber glue. The upper plate 1261 is used in conjunction with the ring hole of the elastic wall panel mounting frame 127, and the upper plate 1261 is embedded in the ring hole from bottom to top, and the lower plate 1262 supports the elastic wall panel mounting frame 127, and the size of the lower plate 1262 is consistent with the size of the elastic wall panel mounting frame 127. An elastic wall panel mounting opening is provided on the lower panel 123, and the elastic wall panel mounting opening is a step hole with a circle of step surface inside. A circle of upper sealing ring groove 1231 is provided on the circle of step surface, and a sealing ring is provided in the upper sealing ring groove 1231, and the sealing ring is fixed in the upper sealing ring groove 1231 by vaseline ointment. The elastic wall panel mounting frame 127 is embedded in the elastic wall panel mounting opening together with the lower layer plate 1262 of the elastic wall panel 126, and the step surface supports the lower layer plate 1262, and countersunk nails are used to pass through the preset upward and downward countersunk holes on the elastic wall panel mounting frame 127 and the preset upward and downward through holes on the lower layer plate 1262 of the elastic wall panel 126 to be fastened to the step surface. The lower layer plate 1262 of the elastic wall panel 126 and the step surface are sealed by a sealing ring, and the upper surface of the elastic wall panel 126, the upper surface of the elastic wall panel mounting frame 127 and the upper surface of the lower panel 123 are flush.

[0036] A lower sealing ring groove 1232 is provided on the lower surface of the lower panel 123 around the elastic wall panel installation opening, a sealing ring is placed in the lower sealing ring groove 1232, and the sealing ring is fixed in the lower sealing ring groove 1232 by vaseline ointment, and an aluminum alloy cover plate 131 is installed on the lower side of the lower panel 123 by screws to close the elastic wall panel installation opening, the lower panel 123 and the cover plate 131 are sealed by a sealing ring, and a cavity is formed between the cover plate 131 and the elastic wall panel 126, and an air guide hole 1311 connected to the cavity is provided on the cover plate 131, and the cavity is connected to the outside, and the air guide hole 1311 can be connected to an external vacuum pump to adjust the pressure in the sealed cavity to meet the required cavity pressure.

[0037] The test method using a binary rectangular nozzle visualized flexible deformation expansion section test device comprises the following steps:

[0038] 1. Install the experimental device on the base, install the sensors, connect the data acquisition device, and check whether the sensors and data acquisition device are connected normally.

[0039] 2. Set up the optical path of the Schlieren system, turn on the camera and aim it at the observation window to start recording, and at the same time turn on the data acquisition device to record the data.

[0040] 3. Turn on the external vacuum pump to adjust the pressure in the cavity.

[0041] 4. Start the experiment, open the pneumatic valve, input high-pressure gas into the gas supply system, and the gas expands in the experimental device to generate thrust.

[0042] 5. Close the pneumatic valve, check the images recorded by the camera and the data collected by the sensor, process and analyze the data, and the experiment ends.

[0043] The above-mentioned technologies not specifically mentioned are all referred to the prior art.

[0044] Based on the above-mentioned ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above-mentioned description. The technical scope of the present invention is not limited to the contents of the specification.

Claims

1. A binary rectangular nozzle visualized flexible deformation expansion section test device, characterized in that: It comprises a nozzle test section (1), a transition section (2), a connection section (3), a rectification section (4) and an air intake section (5) which are connected in sequence; The nozzle test section (1) comprises a nozzle mounting frame (11) connected to the transition section (2) and a nozzle main body (12) connected to the nozzle mounting frame (11); the nozzle mounting frame (11) has a rectangular flow channel connected to the transition section (2); the nozzle main body (12) is connected and surrounded by an upper panel (122), a lower panel (123), a left optical glass plate (124), and a right optical glass plate (125); a left glass baffle (130) is provided on the outer side of the left optical glass plate (124) and abuts against the left optical glass plate (124); a right glass baffle is provided on the outer side of the right optical glass plate (125) and abuts against the right optical glass plate (125); both the left glass baffle (130) and the right glass baffle have through openings serving as observation windows; the upper panel (122) ) are mounted with a plurality of nozzle main body pressure measuring connectors (132) for connecting to a pressure sensor; an elastic wall plate mounting opening is provided on the lower panel (123), an elastic wall plate (126) is mounted in the elastic wall plate mounting opening, the upper surface of the elastic wall plate (126) is flush with the upper surface of the lower panel (123), a cover plate (131) is mounted on the lower side of the lower panel (123) to close the elastic wall plate mounting opening, a cavity is formed between the cover plate (131) and the elastic wall plate (126), and an air guide hole (1311) connected to the cavity is provided on the cover plate (131); a connecting section pressure measuring connector (32) for connecting to a pressure sensor, a total pressure measuring device (31), and a connecting section temperature measuring connector (33) for connecting to a temperature sensor are mounted on the connecting section (3).

2. The binary rectangular nozzle visualized flexible deformation expansion section test device according to claim 1 is characterized in that: Four mounting rods (111) are evenly distributed around the rectangular flow channel of the nozzle mounting frame (11), two of which are located at the top and two at the bottom. The nozzle main body (12) also includes a support platform (121), two upper mounting plates (128) and two lower mounting plates (129). The support platform (121) includes a square sleeve with an end plate at one end. The end plate is provided with a rectangular through hole that is consistent with the outlet of the rectangular flow channel. The open end of the sleeve is sleeved with a The nozzle mounting frame (11) is fixed on the outer peripheral wall of the rectangular flow channel, the upper panel (122) and the lower panel (123) are respectively fixed on the upper hole edge and the lower hole edge of the through hole, the two upper mounting plates (128) and the two lower mounting plates (129) are both mounted on the end plate, the two upper mounting plates (128) clamp the upper panel (122), the lower end surfaces of the two upper mounting plates (128) are flush with the lower surface of the upper panel (122), and the two lower mounting plates (129) are fixed on the upper hole edge and the lower hole edge of the through hole. The mounting plates (129) clamp the lower panel (123); the upper end surfaces of the two lower mounting plates (129) are flush with the upper surface of the lower panel (123); the upper parts of the two upper mounting plates (128) are respectively fixed to the two upper mounting rods (111); the lower parts of the two lower mounting plates (129) are respectively fixed to the two lower mounting rods (111); the left optical glass plate (124) is mounted between the two mounting rods (111) on the same side; the right optical glass plate (125) is mounted between the two mounting rods (111) on the same side; the left glass baffle (130) is mounted on the two mounting rods (111) on the same side; the right glass baffle is mounted on the two mounting rods (111) on the same side; the observation windows on the left glass baffle (130) and the right glass baffle are respectively opened on the end surfaces of the left glass baffle (130) and the right glass baffle at one end away from the nozzle mounting frame (11), forming a C shape.

3. The binary rectangular nozzle visualized flexible deformation expansion section test device according to claim 2 is characterized in that: The nozzle body (12) further comprises a rectangular ring-shaped elastic wall plate mounting frame (127), wherein the elastic wall plate (126) comprises an upper plate (1261) and a lower plate (1262) fixed to the upper plate (1261) by gluing, wherein the upper plate (1261) is fitted into the ring hole of the elastic wall plate mounting frame (127), the lower plate (1262) supports the elastic wall plate mounting frame (127), and the size of the lower plate (1262) is consistent with the size of the elastic wall plate mounting frame (127); the elastic wall plate mounting opening on the lower panel (123) is a stepped hole having a circle of stepped surfaces inside; the elastic wall plate mounting frame (127) is fitted into the elastic wall plate mounting opening and fixed, and the stepped surfaces support and fix the lower plate (1262); and the upper surface of the elastic wall plate mounting frame (127) is flush with the upper surface of the elastic wall plate (126).

4. The binary rectangular nozzle visualized flexible deformation expansion section test device according to claim 3 is characterized in that: A sealing groove is respectively provided on the outer side surface of each upper mounting plate (128) and lower mounting plate (129) and the outer wall of the sleeve on both sides; the sealing grooves on the upper mounting plate (128) and the lower mounting plate (129) on the same side are connected via the sealing groove on the sleeve on the same side; a sealing strip is placed in the sealing groove; the left optical glass plate (124) is sealed with an upper mounting plate (128), a lower mounting plate (129) and the outer wall of the sleeve on the same side via the sealing strip; the right optical glass plate (125) is sealed with an upper mounting plate (128), a lower mounting plate (129) and the outer wall of the sleeve on the same side via the sealing strip; An upper sealing ring groove (1231) is provided on a circle of stepped surface at the installation opening of the elastic wall plate, a sealing ring is placed in the upper sealing ring groove (1231), and the lower plate (1262) of the elastic wall plate (126) and the stepped surface are sealed by the sealing ring; A lower sealing ring groove (1232) is provided on the lower surface of the lower panel (123) around the elastic wall plate installation opening. A sealing ring is placed in the lower sealing ring groove (1232). The lower panel (123) and the cover plate (131) are sealed via the sealing ring.

5. The binary rectangular nozzle visualized flexible deformation expansion section test device according to claim 4 is characterized in that: One end of the air inlet section (5) is used for connecting to the air supply system, and the other end is connected to one end of the rectifying section (4) through a flange. The other end of the rectifying section (4) is connected to one end of the connecting section (3) through a flange. The other end of the connecting section (3) is connected to one end of the transition section (2) through a flange. The other end of the transition section (2) is connected to the nozzle test section (1) through a flange. A transition section fixing frame (21) is installed on the transition section (2), a connecting section fixing frame (34) is installed on the connecting section (3), and a rectifying section front fixing frame (42) and a rectifying section rear fixing frame (43) are installed on the rectifying section (4).

6. The binary rectangular nozzle visualized flexible deformation expansion section test device according to claim 5 is characterized in that: A porous medium plate (41) is installed in the rectifying section (4).

7. The binary rectangular nozzle visualized flexible deformation expansion section test device according to claim 6 is characterized in that: The upper panel (122) is provided with four vertically penetrating pressure measuring holes, and the nozzle body pressure measuring connector (132) is threadedly connected to the pressure measuring holes; the connecting section (3) is provided with two through-going pressure measuring holes and one through-going temperature measuring hole, the connecting section pressure measuring connector (32) is threadedly connected to one of the pressure measuring holes, the total pressure measuring device (31) is installed on the other pressure measuring hole, and the connecting section temperature measuring connector (33) is threadedly connected to the temperature measuring hole.

8. The binary rectangular nozzle visualized flexible deformation expansion section test device according to claim 7 is characterized in that: The left optical glass plate (124) and the right optical glass plate (125) are quartz glass plates, the elastic wall plate (126) is made of rubber, the support platform (121), the upper panel (122), the lower panel (123), the upper mounting plate (128), the lower mounting plate (129), the mounting rod (111), the left glass baffle (130), the right glass baffle, and the cover plate (131) are all made of aluminum alloy, and the connecting section (3), the transition section (2), the rectifying section (4), and the air intake section (5) are all made of stainless steel.

9. The test method of the binary rectangular nozzle visualized flexible deformation expansion section test device according to any one of claims 1 to 8, characterized in that: The steps include:

1. Install the experimental device and sensors, connect the data acquisition device, and check whether the sensors and data acquisition device are connected normally; 2. Set up the optical path of the Schlieren system, turn on the camera and aim it at the observation window to start recording, and at the same time turn on the data acquisition device to record data; 3. Turn on the external vacuum pump to adjust the pressure in the cavity; 4. Start the experiment, open the pneumatic valve, input high-pressure gas into the gas supply system, and the gas expands in the experimental device to generate thrust; 5. Close the pneumatic valve, check the images recorded by the camera and the data collected by the sensor, process and analyze the data, and the experiment ends.

Images