基于CFD的混流式水轮机全流道三维数值模拟

3-D numerical simulation through the whole flow passage of francis turbine that based on CFD

基于CFD计算软件,以N-S方程为控制方程,采用Sparlart-Allmaras湍流模型和结构化网格,对蜗壳、固定导叶、活动导叶、转轮及尾水管等过流部件进行了全过流部件的三维数值模拟。利用NUMECA自带后处理模块,通过流场分析原转轮流道内速度矢量分布和静态压力分布。解释了设计中不足及由此产生的过流能力差和效率低等问题。据此在不改变其他过流部件的前提下,提出了对转轮进行了改造的措施,经证明取得良好的效果。

Based on CFD software, Navier-Stokes equations, Sparlart-Allmaras turbulence model and the structure mesh method, the whole flow passage of spiral case, stay vane, guide vane, runner, draft tube were 3-D numerical simulated. By CFView, the distribution of velocity vector and static pressure in the flow passages through flow field were analyzed, which explained the shortcomings of design and its incidental problems of lower discharge capacity and lower efficiency.So improvement of runner alone was promoted, which produced good results.