大型冲击式水轮机球型分岔配水机构水力特性及磨蚀预测  

Hydraulic Characteristics and Erosion Prediction of the Spherical Bifurcation Distributor for Large Pelton Turbine

作　　者：张咏棋 李朝辉 王晓东 王崇勋 张昌兵[1] ZHANG Yong-qi;LI Zhao-hui;WANG Xiao-dong;WANG Chong-xun;ZHNAG Chang-bing(College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,Sichuan Province,China)

机构地区：[1]四川大学水利水电学院,四川成都610065

出　　处：《中国农村水利水电》2024年第9期123-129,共7页China Rural Water and Hydropower

基　　金：科技部重点研发计划(20202Y042)。

摘　　要：随着冲击式水轮机向大容量发展,配水机构的水沙气多相流特性和泥沙磨蚀受到广泛关注。为此,提出一种月牙肋球型分岔六喷嘴配水机构,采用RANS-ELES混合紊流数值模型模拟了配水机构的水力特性,水气交界面采用VOF模型进行追踪,并分析了不同肋宽比对流场和泥沙磨蚀的影响。结果表明:小肋宽比能改善配水机构射流质量,并有利于配水环管分叉部位抗泥沙磨蚀。研究成果可为类似冲击式水轮机的设计与运行提供借鉴。With the development of Pelton turbine towards large-capacity,the water-sand-air multiphase flow characteristics as well as sedi-ment erosion in the distributor have received extensive attention.A six-nozzles crescent-rib spherical bifurcation distributor is presented in this article.The hydraulic characteristics of the distributor are simulated using the RANS-ELES mixed turbulence numerical model,the wa-ter-air interface is tracked using the Volume of Fluid(VOF)model,and the effects of different rib-width ratios on the flow field and sedi-ment erosion are analyzed.The results indicate that a smaller rib-width ratio can improve the quality of water-jet and is beneficial for the an-ti-sediment erosion of the bifurcation part.The findings can provide reference for the design and operation of similar Pelton turbines.

关 键 词：冲击式水轮机 球型分叉配水机构 月牙肋 多相流 泥沙磨蚀 

分 类 号：TV734.1[水利工程—水利水电工程]