低压条件下热式气体流量传感器测量方法的研究

Research measurement of thermal type gas flow sensor with low pressure condition

提出了一种建立在文丘利喷嘴基础上的,能够在低压条件下进行气体流量测量的方法,实现了较大压力范围内的气体流量测量。通过在绝对压力条件下和20kPa压力条件下的气体流量试验对比,分析了气体流量在常压下测量与在低压下测量所产生的差异的大小和原因。

A measurement for gas flow to be measured at low pressure condition based on Venturi nozzle is introduced. Gas flow measurement has been achived in large pressure range. Through the comparion of gas flow test between absolute pressure and 20kPa pressure, the size and reason of difference has been analyzed under normal and low pressure.