高水头混流式水轮机长短叶片导叶内部流动数值模拟

High Head Mixed Flow Turbine Long and Short Blades Numerical Simulation of Internal Flow of Guide Vanes

通过对某高水头水电站水轮机全流道三维数值模拟,研究3种不同工况下导叶流域的内部流动特性,并针对HLA542-LJ-275水轮机为例的数值计算结果进行分析。结果表明,在3种工况下,活动导叶内部泥沙浓度最大区域出现在导叶头部附近并且靠近头部的地方出现了显著的高压区,泥沙速度最高区域位于活动导叶吸力面。研究结果对高水头水电站的水轮机选型和设计具有一定的指导意义。

In this study,the three-dimensional numerical simulation of the full flow channel of a high-head hydropower station turbine is used to study the internal flow characteristics of the guide vane watershed under three different conditions,and the numerical calculation results of the HLA542-LJ-275 turbine are analyzed.The results show that under three operating conditions,the area with the highest sediment concentration inside the movable guide vane appears near the head of the guide vane and a significant high-pressure area appears near the head.The area with the highest sediment velocity is located on the suction surface of the movable guide vane.The research findings have some guiding significance for the selection and design of the turbines of the high-head hydropower stations.