某电站灯泡贯流式机组压力脉动特性研究  

A Study on Pressure Fluctuation Characteristics of Bulb Tubular Turbine in a Plant

作　　者：姚丹[1,2] 马彪 李正贵 YAO Dan;MA Biao;LI Zheng-gui(International Center on Small Hydro Power,Zhejiang Province, Hangzhou 310002,China;Key Laboratory of Fluid and Power Machinery,Ministry of Education, XI Hua University,Sichuan Province, Chengdu 611730,China)

机构地区：[1]国际小水电中心,杭州310002 [2]流体及动力机械教育部重点实验室—西华大学,成都611730

出　　处：《中国农村水利水电》2019年第12期191-196,199,共7页China Rural Water and Hydropower

基　　金：政府间国际科技创新合作重点项目(SQ2018YFHZ010004);流体及动力机械教育部重点实验室-西华大学开放基金课题(szjj2019-023)

摘　　要：某电站灯泡贯流式水轮机组振动问题较为严重,尤其是转轮室裂纹问题,需明确引起机组水力振动的主要原因,为电站优化运行提供理论依据。运用模型试验、真机试验、CFD数值模拟三种试验方法,研究该机组的水压力脉动特性和造成机组水力振动的最主要因素。研究结果表明压力脉动的第一主频为4X(叶片数×转频),且振动幅值随着桨叶开度的增加而增大。最终得出结论:动静干涉是引起机组压力脉动的最主要原因,狭缝射流引起的疲劳破坏是转轮室裂纹的主要诱因。There is a bulb tubular turbine installed hydropower plant having serious problems of unit vibration,which particularly results in cracks of the runner room.It needs to find out the main factors to cause hydraulic vibration of the unit so as to provide with theoretical basis for optimal operation of the plant.This paper,applying three testing means,namely model test,CFD test and prototype test,makes a research on characteristics of water pressure fluctuation and finds out the reasons of the turbine’s vibration.The results show that the main frequency of pressure fluctuation is 4X which is blade number multiplied by rotation frequency,and the vibration amplitude increases following the opening of the blade.It draws a conclusion that rotor-stator interaction is the main factor causing vibration and the fatigue failure caused by slot jet impingement is the main inducement making cracks of runner chamber.

关 键 词：灯泡贯流式机组 压力脉动 模型试验 真机试验 CFD试验 

分 类 号：TV734.1[水利工程—水利水电工程]