混流式水轮机压力脉动预测

Prediction of Pressure Fluctuation through Francis Turbine

通过混流式模型水轮机全流道的三维非定常紊流计算 ,预测了引水部件和尾水管的压力脉动。计算以N -S方程为基础 ,基于贴体坐标和交错网格划分 ,对控制方程进行变换和离散 ,采用SIMPLEC算法求解 ,应用了RNG的k -ε湍流模型。

In the present work, the three-dimensional unsteady turbulent flow is simulated through the whole flow passage of Francis turbine, the pressure fluctuation caused by the unsteady flow of vortex tape through Francis turbine is predicted. Based on Navier-Stokes equations and the RNG k-ε model, the SIMPLEC algorithm with body-fitted coordination and staggering grid system is applied for the solution of the discretization governing equations.