Continuous measurement method for steady flow field of pneumatic probe based on pre-dynamic calibration
A technology of dynamic calibration and steady flow field, applied in aerodynamic tests, testing of machine/structural components, measuring devices, etc., which can solve problems such as increasing test and measurement time.
Active Publication Date: 2022-03-25
中国空气动力研究与发展中心空天技术研究所
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Problems solved by technology
However, this measurement method will greatly increase the test measurement time when the measurement requires a large number of space measurement points or the pressure of the pressure measurement pipeline has a long stabilization time.
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Embodiment 1
[0051] The continuous testing method of the steady flow field of the pneumatic probe based on the pre-dynamic calibration of the present invention comprises the following steps:
[0052] S10. Perform a dynamic calibration test to obtain the pressure dynamic transfer characteristics of the probe pipeline;
[0053] S11. Install a pneumatic probe pipeline pressure dynamic calibration device;
[0054] Such as figure 1 As shown, the dynamic calibration device includes a balloon 1, a mount 2, a pneumatic probe 3, a pressure measuring pipeline 4, a pressure sensor I5, a pressure sensor II6 and a pressure acquisition and testing system 7;
[0055] The pneumatic probe 3 and the pressure sensor I5 are installed on the mounting base 2, the balloon 1 is set on the mounting base 2, the measuring hole of the pneumatic probe 3 and the sensing part of the pressure sensor I5 are placed inside the balloon 1; the pressure measuring pipeline The front end of 4 is connected to the tail end of th...
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The invention discloses a method for continuously testing the constant flow field of a pneumatic probe based on dynamic calibration in advance. The continuous test method first uses the pressure step excitation signal generated by the pressure signal generator and the output response signal of the probe pipeline to the excitation signal, and obtains the dynamic transmission characteristics of the probe pipeline system to the pressure signal through the system identification method, and then In the actual flow field test, the dynamic transfer characteristic parameters are used to correct the measurement data of the pressure sensor at the end of the pneumatic probe pipeline to obtain the "real" pressure change felt by the continuous movement of the pneumatic probe at the hole measurement position. The continuous test method is suitable for test environments where the test pressure level is near atmospheric pressure, can significantly improve the test efficiency of the aerodynamic parameters of the flow field of the pneumatic probe, and reduce the test cost.
Description
technical field [0001] The invention belongs to the technical field of pneumatic testing, and in particular relates to a continuous testing method for a steady flow field of a pneumatic probe based on dynamic calibration in advance. Background technique [0002] The standard pneumatic probe measurement system consists of a pneumatic probe, a pressure measuring hose and a pressure sensor (pressure scanning valve), etc., and is generally used for the measurement of aerodynamic parameters in a steady state flow field. Since the lumen effect formed by the pneumatic probe and the pressure measuring hose will cause the hysteresis of the changing pressure signal measured by the pressure sensor connected to the end of the pressure measuring hose, when using the pneumatic probe to measure the flow field parameters in different spatial positions , the discrete point measurement method is usually used, that is, after the pneumatic probe reaches the measurement point, it needs to wait f...
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IPC IPC(8): G01M9/06G01L11/00G01L27/00
CPCG01M9/06G01L11/00G01L27/002
Inventor 陈峰王素洁江辉谭锡容李聪岳少原
Owner 中国空气动力研究与发展中心空天技术研究所