开敞式蜗壳轴流式水轮机湍流计算及性能预估

TURBULENT FLOW SIMULATION AND PERFORMANCES PREDICTION ON THE KAPLAN TURBIN?MODEL WITH OPEN CASING

本文在进行模型水轮机试验的基础上,完成了开敞式蜗壳轴流式模型水轮机的全流道三维定常湍流计算。计算程序以雷诺时均连续方程和N-S方程作为控制方程,选用标准κ-ε双方程湍流模型使方程组封闭。数值求解通过CIMPLEC算法实现速度、压力的分离求解,离散差分格式具有二阶精度。通过计算获得了各过流部件的流动细节,预估了水轮机的能量性能,并与试验结果进行了比较。

In the present paper, the three-dimensional steady turbulent flow is simulated through the whole flow passage of the Kaplan turbine model after the experiment on the turbine. Based on Reynolds time averaged continuity equations, Navier-Stokes equations and the standard κ-ε model, the SIMPLEC algorithm with body-fitted coordinates and staggering grid system are applied for the solution of the discretization governing equations. The detail of flow through the whole flow passage is attained, and the energy performances of the Kaplan turbine model are predicted, which is compared with the results of experiment.