Residual gas ejection-type high-enthalpy pure incoming flow wind tunnel test system

Abstract

Disclosed is a residual gas ejection-type high-enthalpy pure incoming flow wind tunnel test system, comprising a gas generation unit (1), a heat transfer device (2), residual gas piping (3), a high-enthalpy air flow-guiding unit, a test section (4), and a residual gas ejection unit. The gas generation unit (1) is arranged at the center of a circular ring structure in the axial direction; the heat transfer device (2) is internally provided with a plurality of radial channels (23) and axial channels (24) independent of each other; two ends of each radial channel (23) are respectively in communication with the gas generation unit (1) and the residual gas piping (3); two ends of each axial channel (24) are respectively in communication with an air inlet (21) and the high-enthalpy air flow-guiding unit; an inlet of the test section (4) is connected to an outlet end of the high-enthalpy air flow-guiding unit, and an outlet of the test section (4) merges with an outlet end of the residual gas piping (3) and is connected to an inlet end of the residual gas ejection unit; and the residual gas ejection unit is configured to eject and discharge residual gas and high-enthalpy air to the external environment.

Description

A residual gas ejector type high enthalpy pure incoming flow wind tunnel test system Technical Field

[0001] This invention relates to wind tunnel testing systems, specifically to a residual gas ejector type high enthalpy pure incoming flow wind tunnel testing system. Background Technology

[0002] Currently, the research and development of high-speed aircraft and their propulsion systems mainly relies on three methods: wind tunnel testing, numerical simulation, and flight testing. Among these, wind tunnel testing is the foundation for the research and performance evaluation of aircraft and their propulsion systems, and high-enthalpy wind tunnel testing systems are commonly used. A high-enthalpy wind tunnel testing system consists of three main parts: a drive module, a test section, and an exhaust module. The drive module primarily generates high-enthalpy, high-pressure gas, which is then expanded and accelerated through the equipment's nozzle to obtain the simulated incoming flow required for the test. After passing through the test section, the simulated incoming flow is discharged through the exhaust module.

[0003] In the drive module, to obtain a high-enthalpy incoming flow that matches flight conditions, fuel is typically injected directly into the incoming flow for combustion heating to increase its temperature. However, combustion heating inevitably introduces combustion products into the test gas, contaminating it and causing differences in the physical / chemical properties of the test incoming flow compared to real air. Currently, the heating methods used in high-enthalpy pure incoming flow wind tunnels are mainly regenerative heating and electric heating, but both technologies are limited to varying degrees in practical applications. The main drawback of regenerative heating is its limited heat storage, making continuous heating of the incoming air impossible; electric heating, on the other hand, is limited by the power supply capacity of the power grid.

[0004] In addition, ejector exhaust is the most common exhaust method for high-enthalpy wind tunnel exhaust modules. Ejector exhaust systems typically use high-temperature, high-pressure steam as the ejector gas source, thus requiring a separate, relatively large steam generator. Furthermore, steam production consumes a significant amount of heat, and the start-up and operation of the steam generator are quite complex. These factors greatly reduce the efficiency of wind tunnel operation.

[0005] In summary, there is an urgent need to design a high-enthalpy pure incoming flow 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 this invention is to solve the technical problems of limited heating degree and complex exhaust system in existing wind tunnel test systems, and to provide a high enthalpy pure inlet wind tunnel test system with residual gas ejection.

[0007] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0008] A high-enthalpy, pure incoming flow wind tunnel test system with residual gas ejection is characterized by the following features:

[0009] It includes a gas generating unit, a heat transfer device, a gas waste gas pipeline and a high enthalpy air diversion unit connected to the heat transfer device, as well as a test section and a waste gas ejection unit.

[0010] The heat transfer device has a circular cross-section, and the gas generating unit is axially positioned at the center of the circular structure and connected to it to generate high-temperature gas.

[0011] The heat transfer device has an air inlet and an air outlet at both ends of its axial direction, a residual gas outlet on the outer radial side, and multiple independent radial and axial channels inside. Each radial channel is connected to a gas generating unit and a residual gas outlet at both ends, and the inlet end of the residual gas pipeline is connected to the residual gas outlet for transporting high-temperature gas. Each axial channel is connected to an air inlet and an inlet end of a high-enthalpy air diversion unit at both ends. Air enters the axial channel through the air inlet and exchanges heat with the high-temperature gas transported by the radial channel to generate high-enthalpy air.

[0012] The interior of the test section is used for high enthalpy wind tunnel tests. Its inlet is connected to the outlet of the high enthalpy air diversion unit, and its outlet converges with the outlet of the gas exhaust pipeline and is connected to the inlet of the exhaust gas ejection unit. The exhaust gas ejection unit is used to eject the gas exhaust transported by the gas exhaust pipeline and the high enthalpy air discharged from the test section to the external environment.

[0013] Furthermore, the residual gas ejector unit includes a residual gas ejector nozzle and a diffuser; wherein, the inlet end of the residual gas ejector nozzle is connected to the outlet of the test section and the outlet end of the residual gas pipeline, respectively, for expanding and accelerating the mixture composed of residual gas and high enthalpy air; the inlet end of the diffuser is connected to the outlet end of the residual gas ejector nozzle, and the diffuser is used to decelerate and pressurize the expanded and accelerated mixture before discharging it to the external environment.

[0014] Furthermore, the high-enthalpy air diversion unit includes a diversion pipeline, a rectifier, and an equipment nozzle arranged sequentially;

[0015] The inlet end of the drainage pipe has a circular structure and is connected to the outlet of the heat transfer device; the outlet end of the drainage pipe 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 and the equipment nozzle to compensate for thermal expansion at the connection.

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

[0018] The combustion chamber is a cylindrical structure, which is installed axially at the center of the annular structure of the heat transfer device.

[0019] The ignition device and the water-cooled blind plate are respectively installed at both ends of the combustion chamber along the axial direction; the end of the combustion chamber near the ignition device is provided with an oxidant inlet and a fuel inlet along the radial direction, and the ignition device is used to make the oxidant and fuel burn in the combustion chamber to generate high-temperature gas; the radial sidewall of the combustion chamber is provided with a plurality of gas holes communicating with the radial channel.

[0020] The water-cooled blind flange 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 integral 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 heat transfer device is equipped with an outlet gas collecting device at the outlet. The two ends of the outlet gas collecting device are connected to the outlet and the drainage pipe, respectively, to collect high enthalpy air.

[0024] Furthermore, the gas surplus pipeline includes multiple gas pipes connected in sequence, and corrugated compensators are installed at the connection points of 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 ejection 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 structure. The gas generating unit is set on the axis of the circular structure and connected to the circular structure. At the same time, the heat transfer device has 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 channel of the heat transfer device through the radial channel, thereby obtaining high enthalpy air. Then, the high enthalpy air enters the test section through the high enthalpy air ejection unit to complete the wind tunnel test. The residual gas and the high enthalpy air after the test are discharged to the external environment through the residual gas ejection unit. This system can not only achieve pure heating of the incoming air, but also solve the problem of exhaust ejection in the prior art, greatly improving the wind tunnel operating efficiency and reducing the wind tunnel operating cost.

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

[0029] 3. The residual gas ejector type high enthalpy pure incoming flow wind tunnel test system of the present invention guides and rectifies the high enthalpy air 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 wind tunnel test, thereby improving the accuracy of the test.

[0030] 4. The residual gas ejector type high enthalpy pure incoming flow wind tunnel test system of the present invention is equipped with a sealing compensation device at the connection between the rectifier and the equipment nozzle, which improves the sealing performance and safety of the system.

[0031] 5. The residual gas ejector type high enthalpy pure incoming flow wind tunnel test system of the present invention has an oxidant inlet and a fuel inlet in the combustion chamber of the gas generation unit, so as to achieve a continuous and stable supply of energy required for the heating process.

[0032] 6. In the residual gas ejector type high enthalpy pure incoming air 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 integrated into a structural design. This design makes full use of the incoming air to achieve thermal protection of the combustion chamber and ensures that the heat can be used efficiently. Attached Figure Description

[0033] Figure 1 is a schematic diagram of an embodiment of the residual gas ejector type high enthalpy pure incoming flow wind tunnel test system of the present invention.

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

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

[0036] The reference numerals in the attached drawings are explained as follows: 1-Gas generation unit, 2-Heat transfer device, 21-Inlet, 22-Outlet, 23-Radial channel, 24-Axial channel, 3-Gas waste gas pipeline, 31-Corrugated compensator, 4-Test section, 5-Waste 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 gas hole, 17-Inlet gas collection device, 18-Outlet gas collection device. Detailed Implementation

[0037] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0038] As shown in Figure 1, this embodiment provides a high-enthalpy pure air intake wind tunnel test system with residual gas ejection, including a gas generation unit 1, a heat transfer device 2, a residual gas pipeline 3 and a high-enthalpy air intake unit connected to the heat transfer device 2, as well as a test section 4 and a residual gas ejection unit.

[0039] The radial cross-section of the heat transfer device 2 is a circular structure. The gas generating unit 1 is coaxially arranged on the axis of the circular structure and connected to the circular structure to generate high-temperature gas.

[0040] 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 mounted on the axis of a circular structure.

[0041] Ignition device 12 and water-cooled blind plate 13 are respectively installed at both ends of combustion chamber 11 along the axial direction; oxidant inlet 14 and fuel inlet 15 are respectively provided radially at the end of combustion chamber 11 near ignition device 12. Ignition device 12 is used to make oxidant and fuel burn in combustion chamber 11 and generate high-temperature gas; while water-cooled blind plate 13 is used to block combustion chamber 11.

[0042] Referring to Figures 2 and 3, the heat transfer device 2 has an air inlet 21 and an air outlet 22 at its axial ends, and a residual gas outlet on its radially outer side. The heat transfer device 2 has multiple independent radial channels 23 and axial channels 24 inside. Each radial channel 23 is connected at both ends to the gas generating unit 1 and the residual gas outlet, 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 are circular or rectangular channels, or designed with other structures according to actual needs.

[0043] In this embodiment, the inner annular surface of the heat transfer device 2 and the radial sidewall of the combustion chamber 11 are integral structures, and a plurality of gas holes 16 for communicating with the radial channel 23 are provided on the radial sidewall of the combustion chamber 11.

[0044] Each axial channel 24 is connected to the air inlet 21 and the inlet of the high enthalpy air diversion unit at both ends. Air enters the axial channel 24 through the air inlet 21 and exchanges heat with the high-temperature combustion gas transported by the radial channel 23 to generate high enthalpy air. Then the high enthalpy air enters the high enthalpy air diversion unit.

[0045] Oxidant and fuel medium enter the combustion chamber 11 through oxidant inlet 14 and fuel inlet 15, respectively. They are ignited by ignition device 12, resulting in a combustion reaction and generating high-temperature gas. This high-temperature gas then enters the radial channel 23 through gas inlet 16. Simultaneously, incoming air enters the axial channel 24 within the heat transfer device 2 from air inlet 21, exchanging heat with the high-temperature gas and transforming it into high-enthalpy air required for wind tunnel testing, which then enters the high-enthalpy air intake unit. Afterward, because the residual gas from the heat exchanged high-temperature gas still possesses a high temperature and pressure, it can flow out through the radial channel 23, then through the residual gas pipeline 3, and finally into the residual gas ejector unit.

[0046] In some embodiments, an inlet gas collecting device 17 is installed at the front end of the air inlet 21 of the heat transfer device 2 to collect the air entering the heat transfer device. An outlet gas collecting device 18 is provided at the air outlet 22 of the heat transfer device 2. The two ends of the outlet gas collecting device 18 are respectively connected to the air outlet 22 and the drainage pipe 7 to collect high enthalpy air.

[0047] The gas surplus pipeline 3 includes multiple gas pipes connected in sequence, and high-temperature resistant corrugated compensators 31 are installed at the connection points of adjacent gas pipes for the installation of the gas surplus pipeline 3 and for high-temperature thermal expansion compensation.

[0048] The interior of test section 4 is used for high enthalpy wind tunnel tests. Its inlet is connected to the outlet of the high enthalpy air diversion unit, and its outlet converges with the outlet of the gas exhaust pipeline 3 and is connected to the inlet of the exhaust gas ejector unit.

[0049] The high-enthalpy air diversion unit includes a diversion pipe 7, a rectifier 8, and an equipment nozzle 9 arranged sequentially. The inlet end of the diversion pipe 7 has a circular structure and is connected to the air outlet 22; the outlet end of the diversion pipe 7 converges to the inlet end of the rectifier 8 and is connected to the rectifier 8. The inlet end of the equipment nozzle 9 is connected to the outlet end of the rectifier 8, and the outlet end is connected to the inlet of the test section 4.

[0050] High-enthalpy air is led to the rectifier 8 via the guide pipe 7 to achieve the convergence and rectification of the high-enthalpy incoming flow. The rectified high-enthalpy incoming flow expands and accelerates in the equipment nozzle 9 to generate the simulated airflow required for the test, and then enters the test section 4.

[0051] To improve the system's sealing and safety, this embodiment provides a sealing compensation device 10 at the connection between the rectifier 8 and the equipment nozzle 9, which is used to compensate for thermal expansion at the connection.

[0052] The residual gas ejector unit is located at the tail of the test section 4 and includes a residual gas ejector nozzle 5 and a diffuser 6. It 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.

[0053] Specifically, the inlet end of the residual gas ejector nozzle 5 is connected to the outlet end of the test section 4 and the outlet end of the residual gas pipeline 3, respectively, to expand and accelerate the mixture of residual gas and high enthalpy air. The inlet end of the diffuser 6 is connected to the outlet end of the residual gas ejector nozzle 5, to decelerate and pressurize the expanded and accelerated mixture before discharging it to the external environment.

[0054] This invention connects the gas generating unit 1 to the heat transfer device 2, enabling indirect heating of the incoming air by the gas through the heat transfer device 2. During indirect heating, the gas and the incoming air flow in their respective independent channels, thus achieving pure heating of the incoming air by the gas. After heat exchange, the residual gas produced is led through the residual gas pipeline 3 to the residual gas ejector nozzle 5 located at the tail of the test section 4, thereby ejecting the exhaust gas from the incoming air in the test section 4. The secondary utilization of the high-temperature residual gas not only effectively solves the exhaust ejection problem of the wind tunnel system but also fully utilizes the residual heat of the gas. Therefore, this method greatly improves the operating efficiency of the wind tunnel and reduces its operating costs.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions 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 high-enthalpy, pure incoming flow wind tunnel test system with residual gas ejection, characterized in that: It includes a gas generating unit (1), a heat transfer device (2), a gas waste gas pipeline (3) and a high enthalpy air diversion unit connected to the heat transfer device (2), as well as a test section (4) and a waste gas ejection unit. The heat transfer device (2) has a circular cross-section, and the gas generating unit (1) is coaxially arranged on the axis of the circular structure and connected to the circular structure to generate high-temperature gas. The heat transfer device (2) has an air inlet (21) and an air outlet (22) at its two axial ends, a gas exhaust outlet on its radial outer side, and multiple independent radial channels (23) and axial channels (24) inside. Each radial channel (23) is connected to the gas generating unit (1) and the gas exhaust outlet at its two ends, and the gas exhaust pipeline (3) is connected to the gas exhaust outlet at its inlet end for transporting high-temperature gas. Each axial channel (24) is connected to the air inlet (21) and the inlet end of the high-enthalpy air diversion unit at its two ends, and air enters the axial channel (24) through the air inlet (21) and exchanges heat with the high-temperature gas transported by the radial channel (23) to generate high-enthalpy air. The interior of the test section (4) is used for high enthalpy wind tunnel tests. Its inlet is connected to the outlet end of the high enthalpy air diversion unit, and its outlet converges with the outlet end of the gas exhaust pipeline (3) and is connected to the inlet end of the exhaust gas ejection unit. The exhaust gas ejection unit is used to eject the gas exhaust gas transported through the gas exhaust pipeline (3) and the high enthalpy air discharged through the test section (4) to the external environment.

2. The residual gas ejector type high enthalpy pure incoming flow wind tunnel test system according to claim 1, characterized in that: The residual gas ejector unit includes a residual gas ejector nozzle (5) and a diffuser (6); wherein, the inlet end of the residual gas ejector nozzle (5) is connected to the outlet end of the test section (4) and the outlet end of the gas residual gas pipeline (3) respectively, and is used to expand and accelerate the mixture of gas residual gas and high enthalpy air; the inlet end of the diffuser (6) is connected to the outlet end of the residual gas ejector nozzle (5), and the diffuser (6) is used to decelerate and pressurize the expanded and accelerated mixture before discharging it to the external environment.

3. The residual gas ejector type high enthalpy pure incoming flow wind tunnel test system according to claim 1, characterized in that: The high enthalpy air diversion unit includes a diversion pipe (7), a rectifier (8), and an equipment nozzle (9) arranged in sequence; The inlet end of the drainage pipe (7) has a circular structure and is connected to the outlet (22) of the heat transfer device (2); the outlet end of the drainage pipe (7) converges to the inlet end of the rectifier (8) and is connected to the rectifier (8). The inlet end of the nozzle (9) of the equipment is connected to the outlet end of the rectifier (8), and the outlet end is connected to the inlet of the test section (4).

4. The residual gas ejector type high enthalpy pure incoming flow wind tunnel test system according to claim 3, characterized in that: The connection between the rectifier (8) and the equipment nozzle (9) is provided with a sealing compensation device (10) for compensating for thermal expansion at the connection.

5. The residual gas ejector type high enthalpy pure incoming flow wind tunnel test system according to any one of claims 1 to 4, characterized in that: 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 coaxially mounted on the axis of the annular structure; The ignition device (12) and the water-cooled blind plate (13) are respectively installed at both ends of the combustion chamber (11) along the axial direction; the combustion chamber (11) near the ignition device (12) is provided with an oxidant inlet (14) and a fuel inlet (15) along the radial direction, and the ignition device (12) is used to make the oxidant and fuel burn in the combustion chamber (11) and generate high-temperature gas; the radial sidewall of the combustion chamber (11) is provided with a plurality of gas holes (16) communicating with the radial channel (23); The water-cooled blind plate (13) is used to seal the combustion chamber (11).

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

7. The residual gas ejector type high enthalpy pure incoming flow 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) to collect the air entering the heat transfer device. The outlet (22) of the heat transfer device (2) is provided with an outlet gas collection device (18). The two ends of the outlet gas collection device (18) are connected to the outlet (22) and the high enthalpy air diversion unit, respectively, for collecting high enthalpy air.

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

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

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