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在液压系统和液压元件的研究工作中,常常需要测量液压管路的瞬时流量值。常规的测量方法是先测量压力,然后再推算出流量。使用这种方法必须先知道测量点之间液压系统的阻抗值,而这又不易精确计算。还有目前使用的流量测量仪表,动态品质较差,频率响应一般都很迟钝。利用“热丝”或“热膜”技术来测量流体的流速为解决这一问题提供了一条途径。
In the research of hydraulic system and hydraulic components, it is often necessary to measure the instantaneous flow rate of the hydraulic line. The usual method of measurement is to measure the pressure and then calculate the flow rate. Using this method, you must know the resistance value of the hydraulic system between the measuring points, which is not easy to calculate accurately. There are currently used flow measurement instruments, poor dynamic quality, the frequency response is generally slow. Using “hot wire” or “hot film” techniques to measure the flow rate of a fluid provides a way to solve this problem.