基于大涡模型水轮机压力脉动的数值预测

Numerical Prediction of Pressure Fluctuation within Francis Turbine for Large-eddy Simulation

基于N S方程和大涡湍流模拟(LES)模型,采用贴体坐标和四面体网格系统,对控制方程进行变换和离散,并用SIMPLE算法求解,对混流式水轮机全流道内的三维非定常湍流进行了数值模拟,并对水轮机尾水管内的涡带压力脉动进行了数值预测。

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