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

Abstract

The invention discloses a residual gas injection type high-enthalpy pure incoming flow wind tunnel test system, and mainly solves the technical problems that the heating degree of an existing wind tunnel test system is limited, an exhaust system is complex and the like. The system comprises a fuel gas generation unit, a heat transfer device, a fuel gas residual gas pipeline, a high-enthalpy air drainage unit, a test section and a residual gas injection unit, the fuel gas generating unit is arranged in the center of the circular ring structure in the axial direction; a plurality of radial channels and axial channels which are mutually independent are arranged in the heat transfer device; two ends of each radial channel are respectively communicated with the fuel gas generating unit and the residual fuel gas pipeline; the two ends of each axial channel communicate with the air inlet and the high-enthalpy air drainage unit correspondingly. The inlet of the test section is connected with the high-enthalpy air drainage unit, and the outlet of the test section is converged 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 residual gas of the fuel gas and the high-enthalpy air to the 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] At present, the development of high-speed aircraft and their power plant research mainly relies on three means: wind tunnel test, numerical simulation and flight test. Among them, wind tunnel test is the basis of aircraft and its power plant research and performance evaluation and verification, and high enthalpy wind tunnel test system is the most commonly used wind tunnel test system. The high enthalpy wind tunnel test system consists of three main parts, namely the drive module, the test section and the exhaust module. The drive module mainly generates high enthalpy and high-pressure gas, and accelerates its expansion through the nozzle of the equipment, so as to obtain the simulated incoming flow required for the test. After the simulated incoming flow passes through the test section, it is discharged through the exhaust module.

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

[0004] In addition, the ejection exhaust is the most commonly used exhaust method for high enthalpy wind tunnel exhaust modules. The ejection exhaust system usually uses high-temperature and high-pressure steam as the ejection gas source, so a relatively large steam generation device needs to be built separately. At the same time, the production of steam consumes a lot of heat, and the startup and operation process of the steam generation device is also relatively complicated. These factors greatly reduce the efficiency of wind tunnel operation.

[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 existing in 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 complex exhaust system, and to provide a residual gas injection type high enthalpy pure incoming flow wind tunnel test system.

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

[0008] A residual gas injection type high enthalpy pure inflow wind tunnel test system, which is special in that:

[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 drainage 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 is provided at the radial outer side, and a plurality of mutually independent radial channels and axial channels are provided 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, and the 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 to 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 comprises a drainage pipeline, a rectifying device and an equipment nozzle which are arranged in sequence;

[0015] The inlet end of the drainage pipeline is in a circular ring structure and is 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 rectifying 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 installed at the axial ends of the combustion chamber; an oxidant inlet and a fuel inlet are respectively provided in the radial direction at one end of the combustion chamber close to the ignition device, and the ignition device is used to make the oxidant and the fuel 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 block 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 fuel gas waste 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, and at the same time, a plurality of independent radial channels and axial channels are arranged inside the heat transfer device, and 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, and then the high-enthalpy air enters the test section through the high-enthalpy air injection unit to complete the wind tunnel test, and the residual gas of the gas and the high-enthalpy air after the test are discharged into the external environment through the residual gas injection unit. The system can not only realize the pure heating of the incoming air, but also solve the problem of exhaust injection in the prior art, greatly improve the wind tunnel operation efficiency, and reduce the cost of wind tunnel operation.

[0028] 2. In the residual gas injection type high enthalpy pure incoming flow 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 mixed gas 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 mixed gas 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, so as to ensure 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 incoming flow 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 incoming flow wind tunnel test system of the present invention, the combustion chamber of the gas generating 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 It is a schematic structural diagram of an embodiment of a residual gas injection type high enthalpy pure incoming flow wind tunnel test system of the present invention.

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

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

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

[0037] 1-gas generating unit, 2-heat transfer device, 21-air inlet, 22-air outlet, 23-radial channel, 24-axial channel, 3-gas waste gas pipeline, 31-bellows compensator, 4-test section, 5-waste gas injection nozzle, 6-diffuser, 7-flow 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 purpose, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. 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 incoming flow 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 comprises 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 circular ring 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, and 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; and the water-cooled blind plate 13 is used to seal the combustion chamber 11.

[0043] Combination 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 both axial ends, a residual gas outlet is provided at the radial outer side, and a plurality of mutually independent radial channels 23 and axial channels 24 are provided inside the heat transfer device 2; 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 radial channel 23 and the axial channel 24 are circular channels or rectangular channels, or are designed as channels of other structures according to actual needs.

[0044] In this embodiment, the inner annular surface of the heat transfer device 2 and the radial side wall of the combustion chamber 11 are an integrated structure, and a plurality of gas holes 16 for communicating with the radial channel 23 are provided on the radial side wall of the combustion chamber 11 .

[0045] Both ends of each axial channel 24 are connected to the air inlet 21 and the inlet end of the high enthalpy air induction unit respectively. The 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, and then the high enthalpy air enters the high enthalpy air induction unit.

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

[0047] In some embodiments, an inlet air collecting device 17 is installed at the front end of the air inlet 21 of the heat transfer device 2, which is used to collect the air entering the heat transfer device. An outlet air collecting device 18 is provided at the air outlet 22 of the heat transfer device 2, and the two ends of the outlet air collecting device 18 are respectively connected to the air outlet 22 and the drainage pipeline 7, which is used to collect high enthalpy air.

[0048] The waste gas pipeline 3 includes a plurality of gas pipes connected in sequence, and the connection between two adjacent gas pipes is equipped with a high-temperature resistant corrugated compensator 31 for installation of waste gas pipeline pipes and high-temperature thermal expansion compensation.

[0049] The interior of the test section 4 is used for high enthalpy wind tunnel testing, and its inlet is connected to the outlet end of the high enthalpy air induction unit, and the outlet converges with the outlet end of the fuel gas waste gas pipeline 3 and is connected to the inlet end of the waste gas injection unit.

[0050] The high enthalpy air drainage unit includes 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 an annular structure and is connected to the air outlet 22; 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.

[0051] The high enthalpy air is led to the rectifying device 8 through the drainage pipeline 7 to realize the confluence 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.

[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 rectifying device 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 are used to eject the residual gas transported through the residual gas pipeline 3 and the high enthalpy air exhausted through the test section 4 to the external environment.

[0054] Specifically, the inlet end of the residual gas ejection nozzle 5 is connected to the outlet of the test section 4 and the outlet end of the residual gas pipeline 3, respectively, to expand and accelerate the mixed gas composed 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, to decelerate and pressurize the expanded and accelerated mixed gas and then discharge 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 of the test section 4 through the residual gas pipeline 3, so as to realize the exhaust injection of the incoming air of the test section 4. The secondary utilization of the high-temperature residual gas of the 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 type high enthalpy pure inflow wind tunnel test system, characterized in that: It comprises a gas generating unit (1), a heat transfer device (2), a gas waste gas pipeline (3) and a high enthalpy air drainage unit respectively connected to the heat transfer device (2), a test section (4) and a waste gas drainage 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 two axial ends, a residual gas outlet is provided at 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, the inlet of which is connected to the outlet end of a high enthalpy air induction unit, the outlet of which converges with the outlet end of a gas waste gas pipeline (3) and is connected to the inlet end of a waste gas induction unit; the waste gas induction unit is used for inducing and discharging the gas waste gas transported through the gas waste gas pipeline (3) and the high enthalpy air discharged through the test section (4) to the external environment.

2. The residual gas injection type high enthalpy pure inflow wind tunnel test system according to claim 1 is characterized in that: The residual gas injection unit comprises a residual gas injection nozzle (5) and a diffuser (6); wherein the inlet end of the residual gas injection nozzle (5) is respectively connected to the outlet of the test section (4) and the outlet end of the residual gas pipeline (3) for accelerating the expansion of a mixed gas consisting of residual gas and high enthalpy air; the inlet end of the diffuser (6) is connected to the outlet end of the residual gas injection 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 type high enthalpy pure inflow wind tunnel test system according to claim 1 is 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 type high enthalpy pure inflow wind tunnel test system according to claim 3 is 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 type 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 circular ring structure of the heat transfer device (2); The ignition device (12) and the water-cooled blind plate (13) are respectively installed at two 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 fuel gas waste 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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