不同湍流模型下水轮机蜗壳CFD仿真精度的分析

An Analysis of Spiral Case by CFD and Test on Turbulence Model

为分析不同湍流模型下,水轮机蜗壳流场数值仿真精度的高低,对美国Applegate电站的混流式水轮机金属蜗壳展开了研究。在网格划分、壁面函数选择等相同设置条件下,分别选择标准k-ε、RNGk-ε以及Realizable k-ε湍流模型,进行流场分析和试验。对比仿真和试验数据可知,RNGk-ε湍流模型下,蜗壳的水力性能最好、计算精度最高。为水轮机流道CFD数值模拟中,湍流模型的合理确定,提供了参考依据。

For analyzing the simulation precision of flow in spiral case with different turbulence conditions .This paper takes a spiral case of turbine in American power station called Applegate as an example .The paper chooses standard k-ε,RNG k-εand Realizable k-εmodel ,do simulation and tests .Compared the results ,we get the most accurate conclusions at RNG k-εmodel .Tt provides a ba‐sis for the choice of a reasonable turbulence model for flow simulation .