Exhaust air injection type high-enthalpy clean flow wind tunnel test system

Abstract

The application discloses a residual gas injection type high-enthalpy pure incoming flow wind tunnel test system, and mainly solves the technical problems of limited heating degree of an existing wind tunnel test system and a complicated exhaust system. The system comprises a fuel gas generating unit, a heat transfer device, a fuel gas residual gas pipeline, a high-enthalpy air guiding unit, a test section and a residual gas injection unit; the fuel gas generating unit is arranged at the center of a circular ring structure in an axial direction; the heat transfer device is internally provided with multiple independent radial channels and axial channels; the two ends of each radial channel are in communication with the fuel gas generating unit and the fuel gas residual gas pipeline respectively; the two ends of each axial channel are in communication with an air inlet and the high-enthalpy air guiding unit respectively; the test section inlet is connected with the high-enthalpy air guiding unit, the test section outlet is gathered with the outlet end of the fuel gas residual gas pipeline, and is connected with the inlet end of the residual gas injection unit; and the residual gas injection unit is used for injecting and discharging the fuel gas residual gas and the high-enthalpy air to an external environment.

Description

Technical Field

[0001] The invention relates to a wind tunnel test system, in particular to a residual gas injection type high enthalpy pure incoming flow wind tunnel test system. Background Art

[0002] Currently, the development of high-speed aircraft and their propulsion systems relies primarily on three methods: wind tunnel testing, numerical simulation, and flight testing. Wind tunnel testing is fundamental to the research and performance evaluation of aircraft and their propulsion systems, and high-enthalpy wind tunnel test systems are the most commonly used. High-enthalpy wind tunnel test systems consist of three main components: a drive module, a test section, and an exhaust module. The drive module generates high-enthalpy, high-pressure gas and accelerates its expansion through the device's nozzle, thereby generating the simulated inlet flow required for the test. After passing through the test section, the simulated inlet flow is discharged through the exhaust module.

[0003] In the drive module, to obtain a high-enthalpy inflow that matches flight conditions, the temperature of the inflow is usually increased by directly injecting fuel into the inflow for combustion heating. However, combustion heating inevitably adds combustion products to the test gas, contaminating the test gas and causing certain differences in the physical / chemical properties of the test inflow and real air. Currently, the heating methods used in high-enthalpy pure inflow wind tunnels are mainly thermal storage heating and electric heating, but both heating technologies are subject to varying degrees of limitations in practical applications. The main disadvantage of thermal storage heating technology is that it has limited heat storage and cannot achieve continuous heating of the inflow air; for electric heating technology, it is limited by the power supply capacity of the power grid.

[0004] Furthermore, induced exhaust is the most common exhaust method for high-enthalpy wind tunnel exhaust modules. This system typically uses high-temperature, high-pressure steam as the source of the induced air, requiring a separate, relatively large steam generator. Furthermore, steam production consumes significant amounts of heat, and the startup and operation of the steam generator are complex, significantly reducing wind tunnel efficiency.

[0005] In summary, there is an urgent need to design a high-enthalpy pure inflow wind tunnel test system to avoid or eliminate the shortcomings and limitations of existing high-enthalpy wind tunnel systems. Summary of the Invention

[0006] The purpose of the present invention is to solve the technical problems of the existing wind tunnel test system, such as the limited heating degree and the relatively complex exhaust system, and to provide a residual gas injection type high enthalpy pure inflow wind tunnel test system.

[0007] To achieve the above objectives, the technical solutions provided by the present invention are:

[0008] A residual gas ejection type high enthalpy pure inflow wind tunnel test system, its special features are:

[0009] It includes a gas generating unit, a heat transfer device, a gas residual gas pipeline and a high enthalpy air drainage unit respectively connected to the heat transfer device, a test section and a residual gas ejection unit;

[0010] The radial cross-section of the heat transfer device is a circular ring structure, and the gas generating unit is axially arranged at the center of the circular ring structure and connected to the circular ring structure for generating high-temperature gas;

[0011] The heat transfer device is provided with an air inlet and an air outlet at both axial ends, a residual gas outlet at the radial outer side, and multiple independent radial channels and axial channels inside. The two ends of each radial channel are respectively connected to the gas generating unit and the residual gas outlet, and the inlet end of the residual gas pipeline is connected to the residual gas outlet for conveying high-temperature gas. The two ends of each axial channel are respectively connected to the air inlet and the inlet end of the high-enthalpy air guide unit. Air enters the axial channel through the air inlet and exchanges heat with the high-temperature gas conveyed by the radial channel to generate high-enthalpy air.

[0012] The interior of the test section is used for conducting high-enthalpy wind tunnel tests, the inlet of which is connected to the outlet end of the high-enthalpy air induction unit, the outlet converges with the outlet end of the gas waste gas pipeline, and is connected to the inlet end of the waste gas injection unit; the waste gas injection unit is used to inject and discharge the waste gas transported through the gas waste gas pipeline and the high-enthalpy air discharged through the test section into the external environment.

[0013] Furthermore, the residual gas injection unit includes a residual gas injection nozzle and a diffuser; wherein, the inlet end of the residual gas injection nozzle is respectively connected to the outlet of the test section and the outlet end of the fuel gas residual gas pipeline, and is used to expand and accelerate the mixture composed of the fuel gas residual gas and high enthalpy air; the inlet end of the diffuser is connected to the outlet end of the residual gas injection nozzle, and the diffuser is used to decelerate and pressurize the expanded and accelerated mixture and then discharge it to the external environment.

[0014] Furthermore, the high enthalpy air drainage unit includes a drainage pipeline, a rectifying device and an equipment nozzle arranged in sequence;

[0015] The inlet end of the drainage pipeline is annular and connected to the air outlet of the heat transfer device; the outlet end of the drainage pipeline converges to the inlet end of the rectifier and is connected to the rectifier; the inlet end of the equipment nozzle is connected to the outlet end of the rectifier, and the outlet end is connected to the inlet of the test section.

[0016] Furthermore, a sealing compensation device is provided at the connection between the rectifier device and the equipment nozzle, for compensating for thermal expansion of the connection.

[0017] Furthermore, the gas generating unit comprises a combustion chamber, an ignition device and a water-cooled blind plate;

[0018] The combustion chamber is a cylindrical structure, which is axially mounted at the center of the circular ring structure of the heat transfer device;

[0019] The ignition device and the water-cooled blind plate are respectively mounted at the axial ends of the combustion chamber; an oxidant inlet and a fuel inlet are respectively provided radially at one end of the combustion chamber close to the ignition device, and the ignition device is used to cause the oxidant and fuel to burn in the combustion chamber and generate high-temperature combustion gas; a plurality of combustion holes connected to the radial channel are provided on the radial side wall of the combustion chamber;

[0020] The water-cooled blind plate is used to seal the combustion chamber.

[0021] Furthermore, the inner annular surface of the heat transfer device and the side wall of the combustion chamber are an integrated structure.

[0022] Furthermore, an inlet air collecting device is installed at the front end of the air inlet of the heat transfer device to collect the air entering the heat transfer device;

[0023] The air outlet of the heat transfer device is provided with an outlet air collecting device, and the two ends of the outlet air collecting device are respectively connected to the air outlet and the drainage pipeline for collecting high enthalpy air.

[0024] Furthermore, the residual gas pipeline includes a plurality of gas pipes connected in sequence, and a corrugated compensator is installed at the connection between two adjacent gas pipes.

[0025] Furthermore, the radial channel and the axial channel are circular channels or rectangular channels.

[0026] Compared with the prior art, the present invention has the following beneficial technical effects:

[0027] 1. In the residual gas injection-type high-enthalpy pure incoming flow wind tunnel test system of the present invention, the radial cross-section of the heat transfer device is a circular ring structure. The gas generating unit is axially arranged at the center of the circular ring structure and connected to the circular ring structure. At the same time, the heat transfer device is provided with multiple independent radial and axial channels. The high-temperature gas generated by the gas generating unit exchanges heat with the incoming air entering the axial channels of the heat transfer device through the radial channels, thereby generating high-enthalpy air. The high-enthalpy air then enters the test section through the high-enthalpy air injection unit to complete the wind tunnel test. The residual gas and the high-enthalpy air after the test are discharged into the external environment through the residual gas injection unit. This system not only achieves pure heating of the incoming air, but also solves the problems of exhaust injection in the prior art, greatly improving the operating efficiency of the wind tunnel and reducing the cost of wind tunnel operation.

[0028] 2. In the residual gas injection type high enthalpy pure inflow wind tunnel test system of the present invention, the residual gas injection unit includes a residual gas injection nozzle and a diffuser, wherein the residual gas injection nozzle is used to expand and accelerate the mixture composed of residual gas of the fuel gas and high enthalpy air, and the diffuser is used to decelerate and pressurize the expanded and accelerated mixture and then discharge it to the external environment. This method not only effectively utilizes the residual heat of the fuel gas, but also makes the exhaust injection process more efficient.

[0029] 3. The residual gas injection type high enthalpy pure incoming flow wind tunnel test system of the present invention guides and rectifies the high enthalpy ventilation generated by the heat transfer device in sequence, and then enters the test section through the equipment nozzle, thereby ensuring that the high enthalpy air entering the test section meets the requirements of the wind tunnel test, thereby improving the accuracy of the test.

[0030] 4. The residual gas injection type high enthalpy pure inflow wind tunnel test system of the present invention is provided with a sealing compensation device at the connection between the rectifier and the equipment nozzle, thereby improving the sealing and safety of the system.

[0031] 5. In the residual gas injection type high enthalpy pure inflow wind tunnel test system of the present invention, the combustion chamber of the gas generation unit is provided with an oxidant inlet and a fuel inlet, thereby realizing a continuous and stable supply of energy required for the heating process.

[0032] 6. In the residual gas injection type high enthalpy pure incoming flow wind tunnel test system of the present invention, the inner wall of the heat transfer device and the radial side wall of the combustion chamber are designed as an integrated structure. This design makes full use of the incoming air to achieve thermal protection of the combustion chamber and ensure that the heat can be used efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a structural schematic diagram of an embodiment of the residual gas injection type high enthalpy pure inflow wind tunnel test system of the present invention.

[0034] Figure 2 This is a schematic diagram of the connection structure between the gas generation unit and the heat transfer device in an embodiment of the residual gas injection type high enthalpy pure inflow wind tunnel test system of the present invention.

[0035] Figure 3 This is a schematic structural diagram of the heat transfer device in an embodiment of the residual gas injection type high enthalpy pure inflow wind tunnel test system of the present invention.

[0036] The following are the descriptions of the reference numerals:

[0037] 1-Gas generation unit, 2-Heat transfer device, 21-Air inlet, 22-Air outlet, 23-Radial channel, 24-Axial channel, 3-Gas residual gas pipeline, 31-Bellows compensator, 4-Test section, 5-Residual gas ejector nozzle, 6-Diffuser, 7-Drainage pipeline, 8-Rectifier, 9-Equipment nozzle, 10-Sealing compensation device, 11-Combustion chamber, 12-Ignition device, 13-Water-cooled blind plate, 14-Oxidant inlet, 15-Fuel inlet, 16-Gas hole, 17-Inlet gas collecting device, 18-Outlet gas collecting device. DETAILED DESCRIPTION

[0038] In order to make the objects, advantages and features of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and specific examples. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0039] like Figure 1 As shown, this embodiment provides a residual gas injection type high enthalpy pure inflow wind tunnel test system, including a gas generating unit 1, a heat transfer device 2, a gas residual gas pipeline 3 and a high enthalpy air injection unit respectively connected to the heat transfer device 2, a test section 4 and a residual gas injection unit.

[0040] The radial cross-section of the heat transfer device 2 is a circular ring structure. The gas generating unit 1 is axially arranged at the center of the circular ring structure and connected to the circular ring structure for generating high-temperature gas.

[0041] The gas generating unit 1 includes a combustion chamber 11, an ignition device 12 and a water-cooled blind plate 13. The combustion chamber 11 is a cylindrical structure, which is axially mounted at the center of the annular structure of the heat transfer device 2;

[0042] The ignition device 12 and the water-cooled blind plate 13 are respectively installed at the axial ends of the combustion chamber 11; an oxidant inlet 14 and a fuel inlet 15 are respectively provided radially at one end of the combustion chamber 11 close to the ignition device 12. The ignition device 12 is used to make the oxidant and fuel burn in the combustion chamber 11 and generate high-temperature combustion gas; and the water-cooled blind plate 13 is used to seal the combustion chamber 11.

[0043] Combine Figure 2 and Figure 3 As shown, the heat transfer device 2 is provided with an air inlet 21 and an air outlet 22 at its axial ends, a residual gas outlet at its radial outer side, and multiple independent radial channels 23 and axial channels 24 within the heat transfer device 2. Each radial channel 23 is connected to the gas generating unit 1 and the residual gas outlet at its ends, respectively. The inlet end of the residual gas pipeline 3 is connected to the residual gas outlet for transporting high-temperature gas. The radial channels 23 and axial channels 24 can be circular or rectangular, or designed with other structures as needed.

[0044] In this embodiment, the inner annular surface of the heat transfer device 2 is integrated with the radial side wall of the combustion chamber 11, and a plurality of gas holes 16 are arranged on the radial side wall of the combustion chamber 11 for communication with the radial passages 23.

[0045] The two ends of each axial passage 24 are respectively communicated with the air inlet 21 and the inlet end of the high-enthalpy air guiding unit, and the air enters the axial passage 24 through the air inlet 21, exchanges heat with the high-temperature gas transported by the radial passage 23 to generate high-enthalpy air, and then the high-enthalpy air enters the high-enthalpy air guiding unit.

[0046] The oxidant and fuel medium enter the combustion chamber 11 through the oxidant inlet 14 and the fuel inlet 15 respectively, and the combustion reaction is ignited by the ignition device 12 to generate high-temperature gas, and then the high-temperature gas enters the radial passage 23 through the gas hole 16. At the same time, the airflow enters the axial passage 24 in the heat transfer device 2 from the air inlet 21, thereby exchanging heat with the high-temperature gas, so that the airflow becomes the high-enthalpy air required for the wind tunnel test and enters the high-enthalpy air guiding unit. Then, since the gas residual gas after heat exchange of the high-temperature gas still has a relatively high temperature and pressure, it can flow out of the radial passage 23, and then enter the residual gas injection unit through the gas residual gas pipeline 3.

[0047] In some embodiments, the front end of the air inlet 21 of the heat transfer device 2 is provided with an inlet gas collecting device 17 for collecting the air entering the heat transfer device. The air outlet 22 of the heat transfer device 2 is provided with an outlet gas collecting device 18, and the two ends of the outlet gas collecting device 18 are respectively connected with the air outlet 22 and the guiding pipeline 7 for collecting the high-enthalpy air.

[0048] The gas residual gas pipeline 3 includes a plurality of sequentially connected gas pipes, and a high-temperature resistant corrugated compensator 31 is arranged at the connection between adjacent two gas pipes for installation and high-temperature thermal expansion compensation of the gas residual gas pipeline.

[0049] The inside of the test section 4 is used for high-enthalpy wind tunnel test, and the inlet thereof is connected with the outlet end of the high-enthalpy air guiding unit, and the outlet thereof is connected with the outlet end of the gas residual gas pipeline 3 and the inlet end of the residual gas injection unit.

[0050] The high-enthalpy air guiding unit includes the guiding pipeline 7, the flow regulating device 8 and the equipment nozzle 9 arranged in sequence. The inlet end of the guiding pipeline 7 is in a circular ring structure and is communicated with the air outlet 22; the outlet end of the guiding pipeline 7 converges to the inlet end of the flow regulating device 8 and is connected with the flow regulating device 8. The inlet end of the equipment nozzle 9 is connected with the outlet end of the flow regulating device 8, and the outlet end is connected with the inlet of the test section 4.

[0051] The high-enthalpy air is directed through flow pipe 7 to rectifier 8, which converges and rectifies the high-enthalpy incoming flow. The rectified high-enthalpy incoming flow expands and accelerates in the equipment nozzle 9, generating the simulated airflow required for the test, and then enters test section 4.

[0052] In order to improve the sealing and safety of the system, in this embodiment, a sealing compensation device 10 is provided at the connection between the rectifier 8 and the equipment nozzle 9 to compensate for thermal expansion of the connection.

[0053] The residual gas ejection unit is located at the tail end of the test section 4 and includes a residual gas ejection nozzle 5 and a diffuser 6, which is used to eject the residual gas transported through the residual gas pipeline 3 and the high enthalpy air discharged through the test section 4 to the external environment.

[0054] Specifically, the inlet of the residual gas ejector nozzle 5 is connected to the outlet of the test section 4 and the outlet of the residual gas pipeline 3, respectively, to expand and accelerate the mixture of residual gas and high-enthalpy air. The inlet of the diffuser 6 is connected to the outlet of the residual gas ejector nozzle 5 to decelerate and pressurize the expanded and accelerated mixture before discharging it to the external environment.

[0055] The present invention connects the gas generating unit 1 with the heat transfer device, and realizes the wall-type heating of the incoming air by the gas through the heat transfer device. During the wall-type heating process, the gas and the incoming air flow in their own independent flow channels, thereby realizing the pure heating of the incoming air by the gas. The residual gas generated after the gas completes the heat exchange is connected to the residual gas injection nozzle 5 located at the tail end of the test section 4 through the residual gas pipeline 3, thereby realizing the exhaust injection of the incoming air of the test section 4. The secondary utilization of the high-temperature residual gas not only effectively solves the exhaust injection problem of the wind tunnel system, but also makes full use of the residual heat of the gas. Therefore, this method greatly improves the operating efficiency of the wind tunnel and reduces the operating cost of the wind tunnel.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A residual gas injection high enthalpy pure inflow wind tunnel test system, characterized by: It comprises a gas generating unit (1), a heat transfer device (2), a gas residual gas pipeline (3) and a high enthalpy air drainage unit respectively connected to the heat transfer device (2), a test section (4) and a residual gas ejection unit; The radial cross-section of the heat transfer device (2) is a circular ring structure, and the gas generating unit (1) is axially arranged at the center of the circular ring structure and connected to the circular ring structure for generating high-temperature gas; The heat transfer device (2) is provided with an air inlet (21) and an air outlet (22) at both axial ends, a residual gas outlet is provided on the radial outer side, and a plurality of mutually independent radial channels (23) and axial channels (24) are provided inside; the two ends of each radial channel (23) are respectively connected to the gas generating unit (1) and the residual gas outlet, and the inlet end of the residual gas pipeline (3) is connected to the residual gas outlet for conveying high-temperature gas; the two ends of each axial channel (24) are respectively connected to the air inlet (21) and the inlet end of the high-enthalpy air guide unit, and air enters the axial channel (24) through the air inlet (21) and exchanges heat with the high-temperature gas conveyed by the radial channel (23) to generate high-enthalpy air; The interior of the test section (4) is used for conducting a high-enthalpy wind tunnel test, wherein the inlet is connected to the outlet end of the high-enthalpy air induction unit, the outlet converges with the outlet end of the residual gas pipeline (3), and is connected to the inlet end of the residual gas injection unit; the residual gas injection unit is used to inject and discharge the residual gas transported through the residual gas pipeline (3) and the high-enthalpy air discharged through the test section (4) into the external environment.

2. The residual gas injection high enthalpy pure inflow wind tunnel test system according to claim 1, characterized in that: The residual gas ejection unit comprises a residual gas ejection nozzle (5) and a diffuser (6); wherein the inlet end of the residual gas ejection nozzle (5) is respectively connected to the outlet of the test section (4) and the outlet end of the residual gas pipeline (3), and is used to expand and accelerate the mixed gas consisting of the residual gas and high enthalpy air; the inlet end of the diffuser (6) is connected to the outlet end of the residual gas ejection nozzle (5), and the diffuser (6) is used to decelerate and pressurize the expanded and accelerated mixed gas and then discharge it to the external environment.

3. The residual gas injection high enthalpy pure inflow wind tunnel test system according to claim 1, characterized in that: The high-enthalpy air drainage unit comprises a drainage pipeline (7), a rectifying device (8) and an equipment nozzle (9) which are arranged in sequence; The inlet end of the drainage pipeline (7) is in a circular ring structure and is in communication with the air outlet (22) of the heat transfer device (2); the outlet end of the drainage pipeline (7) converges to the inlet end of the rectifying device (8) and is connected to the rectifying device (8); The inlet end of the equipment nozzle (9) is connected to the outlet end of the rectifying device (8), and the outlet end is connected to the inlet of the test section (4).

4. The residual gas injection high enthalpy pure inflow wind tunnel test system according to claim 3, characterized in that: A sealing compensation device (10) is provided at the connection between the rectifying device (8) and the equipment nozzle (9) for compensating for thermal expansion of the connection.

5. The residual gas injection high enthalpy pure inflow wind tunnel test system according to any one of claims 1 to 4, characterized in that: The gas generating unit (1) comprises a combustion chamber (11), an ignition device (12) and a water-cooled blind plate (13); The combustion chamber (11) is a cylindrical structure and is axially mounted at the center of the annular structure of the heat transfer device (2); The ignition device (12) and the water-cooled blind plate (13) are respectively installed at the axial ends of the combustion chamber (11); an oxidant inlet (14) and a fuel inlet (15) are respectively provided in the radial direction at one end of the combustion chamber (11) close to the ignition device (12); the ignition device (12) is used to make the oxidant and the fuel burn in the combustion chamber (11) and generate high-temperature combustion gas; a plurality of combustion holes (16) connected to the radial channel (23) are provided on the radial side wall of the combustion chamber (11); The water-cooled blind plate (13) is used to seal the combustion chamber (11).

6. The residual gas injection type high enthalpy pure inflow wind tunnel test system according to claim 5, characterized in that: The inner annular surface of the heat transfer device (2) and the side wall of the combustion chamber (11) are an integrated structure.

7. The residual gas injection type high enthalpy pure inflow wind tunnel test system according to claim 6, characterized in that: An inlet air collecting device (17) is installed at the front end of the air inlet (21) of the heat transfer device (2) for collecting air entering the heat transfer device; The air outlet (22) of the heat transfer device (2) is provided with an outlet air collecting device (18), and the two ends of the outlet air collecting device (18) are respectively connected to the air outlet (22) and the drainage pipeline (7) for collecting high-enthalpy air.

8. The residual gas injection type high enthalpy pure inflow wind tunnel test system according to claim 1, characterized in that: The residual gas pipeline (3) comprises a plurality of gas pipes connected in sequence, and a corrugated compensator (31) is installed at the connection between two adjacent gas pipes.

9. The residual gas injection type high enthalpy pure inflow wind tunnel test system according to claim 8, characterized in that: The radial channel (23) and the axial channel (24) are circular channels or rectangular channels.

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