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在底排风洞实验中,底排流量的测量受流量计下游压强变化的影响。采用临界流量计后,流量计下游压强的变化不会影响流量的测量。文章介绍了临界流量计的设计、流量的测量控制、误差分析和在底排风洞实验中的应用情况。
In the bottom exhaust tunnel experiment, the measurement of the bottom flow is influenced by the pressure change downstream of the flowmeter. After using the critical flowmeter, the flowmeter pressure changes will not affect the flow measurement. The article introduces the design of critical flowmeter, the flow measurement and control, error analysis and the application in the bottom row of wind tunnel experiments.