基于CFD的水轮机导叶翼型数值模拟及分析

基于RNGk-ε湍流模型和三维雷诺时均N-S方程,采用SIMPLEC算法对一个高水头、低比转速混流式水轮机进行全流道三维定常湍流计算,分析活动导叶翼型对水轮机性能的影响.数值计算结果表明,采用对称型和负曲度活动导叶可减少高水头低比转速水轮机导水机构中的漩涡、撞击和叶道涡,可使转轮的效率和出力增加,叶片背面的汽蚀得到改善.

Numerical simulation and analysis of turbine guide vane airfoil based on CFD

Based on RNG k-ε turbulence mode and three-dimensional Reynolds time-averaged N-S equations,the numerical simulation of three-dimensional stationary turbulent flow in whole flow passage of high-head and low-specific speed Francis turbine was conducted with SIMPLEC algorithm.The influence of turbine guide vane airfoil on the performance of this turbine was analyzed,also.It was shown by the numerical result that the negative profile curvature and symmetry of the guide vanes could make the swirl,strike and inter-blade vortices reduced in the flow-guide mechanism of the turbine,making its efficiency increased and the cavitation on the back of the runner blade improved.