湍流模型对双支撑型V锥流量计的适用性研究

Study on applicability of turbulence model for V-Cone flowmeter with double support

本研究旨在探索一种适用于双支撑型V锥流量计仿真工作的湍流模型。以50 mm、100 mm、200 mm口径共计6种样机为研究对象,在常温常压条件下,以水为介质,雷诺数范围为1.0×10^4-29.9×10^4,分别采用标准k-ε、RNG k-ε以及SST k-ω3种湍流模型对其流出系数及其线性度误差指标进行仿真预测。为验证仿真准确度,同时开展实流实验研究,将仿真预测结果与实流实验进行对比,结果表明SST k-ω模型对于不同结构的V锥流量计的仿真线性度误差在0.04%-0.32%,与实流实验吻合较好。利用SST k-ω模型预测的流出系数与实验数据的平均误差为6.6%,优于经典的k-ε模型,更适用于双支撑型V锥流量计流场仿真和流出系数的预测。

To simulate the V-Cone flowmeter with double support,a suitable turbulence model is explored.6 kinds of prototype including 50 mm,100 mm and 200 mm caliber,fare taken as the research objects.Under the normal temperature,normal pressure,reynolds number ranging from 1.0 million to 29.9 million,and with water as the medium,the Standard k-ε model,RNG k-ε model and the SST k-ω model are used to carry on the numerical simulation of the discharge coefficient and its linearity error.In order to verify the accuracy,the simulation results are compared with the experimental data of the actual flow.According to the research,the SST k-ω model for simulation of different kinds of V-Cone flowmeter shows that the linearity error is between 0.04% and 0.32%,which agrees well with the experimental data of actual flow.The average predicted error of discharge coefficient using the SST k-ω model is6.6%,which is better than the classical k-ε model.Therefore,the SST k-ω model is more suitable for the internal flow field simulation and the prediction of discharge coefficient for V-Cone flowmeter with double support.