混流式水轮机中旋涡流的LES法预测

Numerical Prediction of Vortex Flow in Francis Turbine for LES

本文基于N-S方程和大涡模拟(LES)模型,采用贴体坐标和四面体网格系统,用SIMPLE算法求解,对混流式水轮机内部流动进行了三维非定常紊流计算,较准确地预测了一混流式水轮机在各工况下的内部流动,尤其是尾水管和转轮内的旋涡流动。

The three-dimensional unsteady turbulent flow is studied numerically in the whole flow passage of Francis turbine, in specially vortex flow in the draft tube and runner is accurately predicted in this paper. The numerical prediction is based on the Navier-Stokes equations and LES （large-eddy simulation） model. The SIMPLE algorithm with the body-fitted coordinate and tetrahedroid grid system is applied for the solution of the LES equations.