流量稳定性测量方法的对比与分析

Comparison and Analysis of Measurement Methods for Flow Stability

摘要: 水流量装置的技术水平通常由所采用的水泵和阀门质量、稳流或稳压方法以及管道结构设计来决定，并直接反映在流动稳定性这项关键参量之中。然而，现有的稳定性测量方法很难区分实际的流量波动和流量计的噪声，并且测试结果易受流量计工作原理、采样率及响应时间的影响。针对所有安装流量计的测试结果进行比较后发现，涡轮流量计具有最高的实际采样率和最快的响应时间，然而与压力传感器相比，涡轮流量计的响应时间仍然慢约0.1 s；涡轮流量计和科里奥利流量计的测量结果之间有着良好的相关性，表明该试验结果反映了设备的实际流量波动。此外，使用两种不同类型压力传感器的一大优势是能够检测高频的流量波动。

Abstract: The technical level of the water flow facility is usually determined by the quality of the water pump and valve, the method of steady flow or steady pressure and the design of the pipe structure, and is directly reflected in the key parameter flow stability. However, the existing stability measurement methods are difficult to distinguish between the actual flow fluctuation and the noise of the flowmeter, and the test results are easily affected by the principle of the flowmeter, the sampling rate and the response time. Compared with all the test results of the flowmeter, the turbine flowmeter has the highest sampling rate and the fastest response time. However, com-pared with the pressure sensor, the response time of the turbine flowmeter is still slower about 0.1 s, and there is a good phase between the measurement results of the turbine flowmeter and the Coriolis flow meter. The results show that the test results reflect the actual flow fluctuation of the facility. In addition, one of the advantages of using two different types of pressure sensors is the ability to detect high frequency flow fluctuations.