双级贯流式水轮机导叶和转轮的水力设计

Hydraulic Design Principles of Vanes and Runners for the Double-stage Tubular Turbine

针对一种新型双级贯流式水轮机,推导了一级导叶、一级转轮、二级导叶和二级转轮的参数设计公式。利用数值模拟商业软件Fluent分析了水轮机在设计工况下的数值性能。数值计算时控制方程采用雷诺时均N-S离散方程,湍流模型选择标准k-ε模型,得到了水轮机的流线图、导叶和转轮叶片的压力面和吸力面的压力分布图,以及中心对称面x=0.083 5的速度矢量图,数值计算结果证明了水轮机设计的正确性。

This paper derived the parameter design formulas for the first-grade guide vane, the first-grade runner, the second- grade guide vane,and the second-grade runner of a new type of double-stage tubular turbine. The commercial software Fluent was used to analyze the numerical performance of the turbine under design conditions. The Reynolds averaged Navier-Stokes e- quation was applied as the control equation in numerical calculation, and the k-ε model was selected as the turbulence model. The streamline diagram of the turbine, the pressure distribution patterns on the pressure surface and suction surface of the guide blade and runner vane, and the velocity vector map of the central symmetric surface at x= 0. 0835 were obtained, which can demonstrate the accuracy of turbine design.