标准U形渠道多孔板式测流的数值模拟研究

Numerical Simulation of Multi-plate Flow Measurement in Standard U-shaped Channel

为了探索多孔板式测流装置在标准U形渠道中的测流精度及影响因素,利用Fluent数值模拟软件对不同流量下的水流流场进行模拟,可得到各个时段水面线的云图。多孔板式测流装置的每对流道相当于一个毕托管,利用动静压管中水的高差即为流速水头,从而得出流速√2G△H。通过观察水面线的变化以及对流速数据的分析,结果发现,数值模拟得到的流速与实际实验得到的流速平均相对误差在5%以内,吻合度很好,符合明渠测流装置测量精度的要求,进一步证明了数值模拟的准确性及可行性。

In order to explore the flow measurement accuracy and influencing factors of the perforated plate type flow measuring device in the standard U-shaped channel,the Fluent numerical simulation software is used to simulate the flow field of different flow rates,and the cloud map of the water surface line at each time period can be obtained.Each pair of flow passages of the perforated plate type flow measuring device is equivalent to one pitot,and the flow difference head is obtained by using the difference √2G△H in water in the static and dynamic pressure tubes to obtain the flow rate.By observing the change of the water surface line and the analysis of the flow velocity data,it is found that the average relative error between the flow rate obtained by the numerical simulation and the actual flow rate is less than 5%,and the coincidence degree is very good,which meets the requirements of the measurement accuracy of the open channel flow measuring device.The accuracy and feasibility of numerical simulation are further proved.