低比转速水轮机活动导叶固液两相数值模拟研究  

Research on the numerical simulation about solid-liquid two-phase flow in wicket gate of low specific speed turbine

作　　者：沈春和 桂林[2] 

机构地区：[1]贵州电力试验研究院,贵州贵阳550002 [2]四川大学水电学院,四川成都610065

出　　处：《贵州电力技术》2015年第5期26-30,33,共6页Guizhou Electric Power Technology

摘　　要：低比速混流式水轮机导叶出口处的最大流速可达50—56m／s，甚至更高，造成该区域的磨蚀较转轮严重．因此有必要对低比转速混流式水轮机的导水机构进行研究。依托某多泥沙水电站低比转速水轮机的实际资料．建立由蜗壳、座环及导水机构组成的三维实体模型，分别对典型工况进行固液两相流数值模拟，探讨固液两相流计算在低比转速水轮机导水机构设计中的应用，共进行了两组模拟，一组为不同工况，相同粒径，一组为相同工况，不同粒径。根据计算结果对磨蚀的原因进行了分析，对导水机构的磨蚀部位进行了预估，与真机实际情况进行了对比分析。为今后的水轮机设计生产提供参考，以及为电站运行工况的选择提供依据。Maximum velocity was up to 50 -56 m/s on wicket gate of low specific speed mixed-flow water turbine, or more. Resulting in serious abrasion of the area of a wheel, so it＇ s necessary for low specific speed mixed-flow water turbine guide water agencies were studied. The 3-D model which contains spiral case, distributor was estalblished according to the actual date of low specific speed turbine in sediment-laden power station. The solid-liquid two-phase flow numerical simulation used to discuss the application of the water body design in low specific speed turbine guide vane. Two case were carried, one case with the same size in different work conditions, another with the same condition in different sizes. According to the results of the analysis of the reason of erosion, erosion position were estimated, the results could provided reference for future turbines design anti basis for the ehoice of power plant operation.

关 键 词：低比速 混流式水轮机 活动导叶 泥沙磨损 数值模拟 

分 类 号：TM74[电气工程—电力系统及自动化]