Variable cross-section heavy piston compressor

A compressor and variable cross-section technology, applied in the field of wind tunnel testing, can solve the problems of reducing the enthalpy value of the wind tunnel, affecting the pressure stability and attenuation of the wind tunnel nozzle chamber, and reducing the relative displacement and the effective test time of the wind tunnel. Extending and alleviating the effect of shock attenuation

Active Publication Date: 2017-06-13
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology

However, in actual operation, the incident shock wave in the free-piston shock tunnel using constant-section heavy-piston compressors is severely attenuated during the travel process, which not only reduces the wind tunnel enthalpy, but also affects the pressure of the wind tunnel nozzle storage chamber the stability of

Method used

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  • Variable cross-section heavy piston compressor
  • Variable cross-section heavy piston compressor
  • Variable cross-section heavy piston compressor

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Embodiment

[0033] Taking a certain wind tunnel as an example, this type of piston compressor is briefly explained. The first and second clamping positions of the main diaphragm of the variable cross-section piston compressor are respectively located 1.1 m and 1.5 m downstream of the thin section of the compression tube. When the first position is enabled, the equivalent length of the shrinkage connection section is about 0.035m, and the equivalent length of the thin section of the compression tube is about 0.135m, so the maximum compression ratio is (11.5+0.035+0.135 ) / 0.135≈86.44, when the second position is enabled, the maximum compression ratio that can be obtained is (11.5+0.035+0.184) / 0.184≈63.70. Such redundant processing will increase the deceleration distance of the piston after the diaphragm is opened. The specific parameters of the variable cross-section piston compressor are shown in Table 1.

[0034] Table 1

[0035]

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Abstract

The invention relates to a variable cross-section heavy piston compressor. The variable cross-section heavy piston compressor comprises a high-pressure air chamber, a heavy piston, a compression pipe and a film clamping mechanism, wherein the high-pressure air chamber is used for driving the heavy piston; the compression pipe is composed of a thick compression pipe section and a thin compression pipe section at a diameter ratio of 2.0-3.5; the heavy piston is driven by the high-pressure air chamber to move inside the thick compression pipe section; the film clamping mechanism clamps a film inside the thin compression pipe section. The variable cross-section heavy piston compressor can effectively relieve shock wave attenuation caused by reflective rarefaction waves, greatly improve the stability of wave tunnel enthylpy value and nozzle chamber pressure and prolong effective wind tunnel testing time.

Description

technical field [0001] The invention relates to a variable-section heavy piston compressor, which belongs to the field of wind tunnel tests. Background technique [0002] The shock tube wind tunnel using a heavy piston compressor (hereinafter referred to as the free piston shock tunnel) is mainly used to obtain high-enthalpy test airflow, simulate the hypersonic (or supersonic) flight environment, and provide aerodynamic / anti-corrosion control for hypersonic aircraft. Thermal design provides technical support. To put it simply, the heavy piston compressor is a special heating and pressurizing device. Its principle is to use high-pressure air to push the heavy piston to move, and to implement rapid isentropic compression on the driving gas in the compression tube through the heavy piston. The driving gas generally adopts light gas such as helium / argon, which has a high specific heat ratio, so after compression, a high temperature and pressure can be obtained. The piston com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/04
CPCG01M9/04
Inventor 朱浩江海南张冰冰毕志献陈星郑永熙蒋博李睿劬吴健马雁捷宋可清林键
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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