可逆式水轮机的数值模拟与性能分析

The Numeric Simulation and Performance Analysis of the Pump Turbine

本文基于Navier-Stokes方程和设计的k-ε湍流模型,采用贴体坐标和交错网格系统,采用SIMPLEC算法对一高水头可逆式水轮机进行了全流道三维湍流数值模拟。详细分析了可逆式水轮机在设计工况以及非设计工况下的双向运转过程中,转轮内部,转轮和导叶交接处和尾水管中的流场,同时讨论了部件的能量性能。并结合相关知识对此进行了初步的分析。计算结果揭示了水泵水轮机转轮内部流动规律及部分原因,预测了此水泵水轮机的水力性能。

In the present paper, based on Navier-Stokes equations and the standard k - ε model, the SIMPLEC algorithm with body-fitted coordination and staggering grid system is applied for the simulation of the three-dimensional turbulent flows through the whole flow passage of the pump turbine. In both cases of design condition and off-design condition, the details of flow through the nmner 、the interface passage of runner and guide and draft tube are analysed, and the energy property of the passages is discussed. The results partly show some regular in the pump turbine runner and its reasons, and the hydraulic property of the pump turbine is predicted.