混流式水轮机压力脉动特性研究  

Study of pressure pulsation characteristics of Francis Turbine

作　　者：罗丽[1] 李景悦[1] 

机构地区：[1]西华大学能源与动力工程学院,四川成都610039

出　　处：《人民长江》2016年第9期95-99,共5页Yangtze River

基　　金：国家自然科学基金资助项目(51379179);西华大学研究生创新基金资助项目(ycjj2015042)

摘　　要：为探究不同长短叶片比例对混流式水轮机压力脉动特性的影响,基于流场数值模拟的计算方法,对不同长短叶片比例的混流式水轮机进行全流道三维非定常湍流计算。计算结果表明,混流式水轮机内部的压力脉动主要由转轮和导叶的动静干扰以及尾水管的低频压力脉动所致;当短叶片出口离转轮旋转轴最近点处与长叶片直径之比为0.6时,混流式水轮机效率最高,为92.66%,且该混流式水轮机各过流部件对应的压力脉动幅值以及振动幅值也最小,水力稳定性最好。对研究背景、计算方法与步骤,以及计算结果的分析等情况均作了较为详细的介绍。To understand the influence of ratio of long and short blades on pressure pulsation of Francis turbine,on the basis of numerical simulation of flow field,the 3D full- passage unsteady turbulent flow in Francis turbine passage for different ratio of long and short blades was calculated The results show that the pressure pulsation inside the Francis turbine is caused by rotor-stator interaction of runner and stator and the low- frequency pressure pulsation of draft tube. The efficiency of the Francis turbine reaches the largest of 92. 66% when the ratio of the closest distance between short blade and rotation axis to the diameter of long blade is equal to 0. 6; meanwhile,the corresponding pressure pulsation amplitude and the vibration amplitude of all flow passage components are the minimum,so the hydraulic stability is the best.

关 键 词：非定常湍流 数值模拟 压力脉动 混流式水轮机 

分 类 号：TV734[水利工程—水利水电工程]