管内流体的温度脉动相关流量测量实验研究

Experimental Study on Flow Rate Measurement of Fluid in Tube Using Temperature Fluctuations Cross Correlation Principle

利用流动流体内固有的温度脉动信号进行流量相关测量的基本原理，讨论了渡越时间测量的方差估计．在此基础上，设计了测量系统的原理样机，以该样机对流量相关测量进行了实验研究．结果表明：利用该样机来实现流量的相关测量是可行的；两热电偶间的距离对测量影响较大；

By using the intrinsic temperature fluctuations in flowing fluid the basic principle of cross correlation flow rate measurement is presented. The variance estimation of the measurement of transit time is discussed. A prototype of the measurement system is developed. The experimental results show that it is feasible to measure the flow rate by using the prototype. The distance of two thermocouples has great effect on the measurement. The measurement results are more satisfactory in turbulent flow than in laminar one.