水轮机蜗壳和固定导叶内部流动的数值模拟

Numerical simulation of internal flows through the spiral casing and stay vanes

为探求蜗壳内部的流动规律 ,优化蜗壳设计 ,对三峡混流式水轮机组模型蜗壳和固定导叶内部的流动进行了紊流解和 Euler解的全三维数值模拟。文中基于 Navier-Stokes方程的标准 k-ε紊流模型、Euler方程模型 ,采用贴体座标和交错网格系统 ,用 SIMPL EC算法 ,对蜗壳和固定导叶内部流动的联合计算结果进行对比分析 ,并与实验值进行了比较。还对流动的不均匀性进行分析 。

This paper analyzes the inflow and optimizes the design of the spiral casing and stay vanes in a Francis turbine. The three dimensional numerical simulation of the hydraulic spiral casing for the Three Gorges Francis turbine was based on the solution of Navier Stokes equations with the standard k ε turbulence model and the Euler equations. The simulation used body fitted coordinates, a staggered grid and the SIMPLEC algorithm. Calculated results for the design operating condition were compared to experimental results. The analysis can be used to improve and optimize the design of the spiral casing and stay vanes through analysis of the non unitform flow.