A Shock Tube Micro-step Pressure Generator
A generator and shock tube technology, applied in the measurement of fluid pressure, instruments, measuring devices, etc., can solve the problem of inability to produce low-step pressure amplitude measurement, and achieve the elimination of retarded vortices, improve repeatability, and improve order. The effect of jumping platform time
Active Publication Date: 2020-04-24
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology
[0003] The purpose of the present invention is to solve the problem that the existing technology cannot produce low step pressure amplitude measurement and the stagnation vortex caused by incomplete membrane rupture, and provides a shock tube micro step pressure generator
Method used
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Embodiment 1
[0020] like figure 1 As shown, a shock tube micro-step pressure generator includes: a high-pressure chamber 1, a clamping machine 2, a low-pressure chamber 3, a back pressure chamber 4, and a semi-infinite tube 5; it also includes a transition device 6 and an active membrane rupture Agency 7;
[0021] The high-pressure chamber 1 and the low-pressure chamber 3 adopt a cylindrical tubular design, the intermediate connection part is designed with a transition device 6, and the inner wall is designed as a slanted structure, which can control the broken area of the diaphragm and avoid the appearance of vortex after incomplete membrane rupture. The clamping machine 2 puts the diaphragm at the connection position, the needle 8 is placed at the rear end of the diaphragm and placed vertically on the diaphragm, the needle point is aligned with the center of the diaphragm, and adopts a hemispherical design. When the high-pressure chamber 1 and the low-pressure chamber 3 When the press...
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Abstract
The invention relates to a shock tube micro step pressure generator, and belongs to a measurement and test technology. The shock tube micro step pressure generator comprises a high-pressure cavity, adiaphragm clamping machine, a low-pressure cavity, a back-pressure cavity and a semi-infinite long tube, and is characterized by further comprising a transition device and an active diaphragm breakingmechanism, wherein the active diaphragm breaking mechanism is partially located in the high-pressure cavity and is contacted with the diaphragm clamping machine; and the transition device is locatedin the low-pressure cavity and is contacted with the diaphragm clamping machine. The shock tube micro step pressure generator effectively controls the diaphragm breaking area through designing the transition device, realizes generation of micro step pressure and eliminates blocking vortex generated by incomplete diaphragm breaking at the same time, thereby enabling the generated shock waves to form plane waves more quickly, and thus improving the step platform time. The pressure in the back-pressure cavity and the low-pressure cavity is effectively balanced by using the design of the semi-infinite long tube, and incident shock waves in the low-pressure cavity are avoided from being transferred to the back-pressure cavity before the end of the required shock wave step platform after diaphragm breaking to affect the actual differential pressure step. The shock tube micro step pressure generator can a fixed diaphragm pressure ratio before diaphragm breaking by adopting the active diaphragm breaking mode, and the repeatability of the experiment is improved.
Description
technical field [0001] The invention relates to a micro-step pressure generator for a shock wave tube, which belongs to the measuring and testing technology. Background technique [0002] As a step pressure generating device, the shock tube is a classic dynamic pressure calibration device, which can generate a step pressure with a very short rise time, and the rise time of the step wave front can be within 0.1 microseconds, within a limited time (Generally within 10ms) The platform pressure is constant, and its amplitude can be calculated from the initial parameters and the shock wave velocity, with an accuracy within 1%. However, the current step pressure amplitudes are all above 10kPa, and it is difficult to achieve lower amplitudes. At the same time, because many shock tubes currently use passive membrane rupture, it is impossible to obtain accurate high pressure chamber pressure. It is usually difficult to achieve complete membrane rupture during the shock tube experim...
Claims
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IPC IPC(8): G01L27/00
CPCG01L27/005
Inventor 杨军薛斌黄日恒李博
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA