混流式水轮机导水机构内水流流态数值模拟

Hydraulic characterisitics of Francis turbine guide apparatus

数值模拟是目前研究混流式水轮机内部流态的一种方法,本文基于Navier-Stokes方程和标准k-ε紊流模型,采用非结构化网格和SIMPLEC算法对由蜗壳、固定导叶和活动导叶组成的流场进行了计算.计算结果表明在该机组额定和最优工况下,水流流线顺畅,撞击和脱流造成的损失很小,导叶流道内速度和速度矩随着半径的减小不断增大,在导叶出口处达到最大.本文对混流式水轮机引水部件的设计、优化和维护有一定的参考价值.

The numerical simulation is a method of the present study in the internal flow pattern of Francis turbine. Based on the Navier-Stokes equations and standard k-ε turbulence model, this paper uses unstructured grid ：and SIMPLEC algorithm to calculate the flow field of the spiral casing, stay vanes and guide vanes. The results show that under the unit rating and optimal conditions, the smooth flow with the current line, small loss caused by the shock and flow ：separation, Guide vane flow velocity and velocity moment is increasing with decreasing radius and the maximum.is at the guide： vane exit. This paper has a certain reference value for the diversion components design, optimization and maintenance of the Francis turbine.