超声波燃气表矩形流道的雷诺修正系数仿真研究

在超声波流量计测量技术中, 雷诺修正系数相关的研究对于提高计量精度有重要作用. 为研究矩形流道的雷诺修正系数与雷诺数的关系, 对矩形流道在常温常压流量较小情况下进行仿真, 结果发现: 矩形流道层流状态下的雷诺修正系数与雷诺数呈线性相关. 保持压强、体积流量不变, 在不同温度下进行仿真及拟合, 结果表明: 在不同温度下雷诺修正系数与雷诺数的线性关系依然满足. 在上述实验基础上, 对矩形流道湍流状态下的雷诺修正系数与雷诺数关系进行研究, 通过改变温度、压强和体积流量进行仿真及拟合发现, 矩形流道湍流状态下雷诺修正系数与雷诺数呈非线性相关.

Simulation research on Reynolds correction coefficient of rectangular flow channel of ultrasonic gas meter

In the measurement technology of ultrasonic flowmeter, the research on the Reynolds correction coefficient plays an important role in improving the measurement accuracy. In order to study the relationship between Reynolds correction coefficient and Reynolds number of the gas in rectangular channel under laminar flow condition, the rectangular flow channel is simulated under the condition of small flow at normal temperature and pressure. Based on the analysis of the fitting results, the conclusion is drawn that the Reynolds correction coefficient of the gas in laminar flow in the rectangular flow channel is linearly related to the Reynolds number. By keeping the pressure and volume flow constant, multiple sets of simulation and fitting experiments are carried out at different temperatures. The results show that the linear correlation between the Reynolds correction coefficient and the Reynolds number is still satisfied at different temperatures. On the basis of the above experiments, the relation between the Reynolds correction coefficient and the Reynolds number of the gas in the rectangular flow channel in the turbulent state is studied. Through simulation and fitting by changing the temperature, pressure and volume flow, it is concluded that the Reynolds correction coefficient of the gas in turbulent flow in the rectangular flow channel is nonlinearly related to the Reynolds number.