水泵水轮机调相运行水环内部流动分析  

Internal Flow Characteristics of Water-ring of Pump-turbine Operating in Synchronous Condenser Model

作　　者：张飞 陈帅 陈振木 祝宝山[4] ZHANG Fei;CHEN Shuai;CHEN Zhen-mu;ZHU Bao-shan(Pumped-storage Technological&Economic Research Institute,State Grid Xinyuan Company Ltd.,Beijing 100761,China;Chongqing Panlong Pumped Storage Co.,Ltd.,Chongqing 401452,China;Department of Mechanical and Electrical Engineering,Wenzhou University,Wenzhou 325035,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]国网新源控股有限公司抽水蓄能技术经济研究院,北京100761 [2]重庆蟠龙抽水蓄能电站有限公司,重庆401452 [3]温州大学机电工程学院,浙江温州325035 [4]清华大学能源与动力工程系,北京100084

出　　处：《水电能源科学》2022年第4期187-190,195,共5页Water Resources and Power

基　　金：浙江省自然科学基金项目(LQ21E090001);国家自然科学基金项目(51679122);浙江省教育厅科研项目(Y202044675);国家电网公司科技项目(52573020000B)。

摘　　要：水泵水轮机调相运行是抽水蓄能机组转换工况的一个重要过程,在泵工况下压水起动过程中,转轮腔体内注入压缩空气以降低泵启动所需功率。以中比转速水泵水轮机的模型为例,基于RNGκ-ε湍流模型,采用VOF多相流模型对水泵水轮机运行在泵工况压水起动阶段的水环现象进行非定常流动分析,探讨水环现象下不同冷却水流量对无叶区内部流动的影响。结果表明,空气与水在无叶区内形成明显的交界面,构成一定厚度的水环,该水环可有效阻止空气从转轮腔体内泄露至蜗壳内,起到对空气的密封作用。同时在不同冷却水流量下,无叶区内的压力脉动均呈动静干涉现象,其主频为叶片通过频率。Synchronous condenser mode is an important process for the conversion condition of pumped storage units.The compressed air is injected into the runner passage to reduce the input power under the condition of pump mode’s starting-up.In this study,a pump turbine model with medium specific speed was utilized for investigating the internal flow characteristic of water-ring.Unsteady state analysis was conducted with the turbulence model of RNGκ-εand multiphase flow model of VOF.The internal flow of the vaneless and the tandem cascade spaces was examined under the water-ring phenomenon.The results show that the air and water form an interface in the vaneless space obviously and a certain thickness of water-ring was formed.Water-ring prevents the air from runner passage into casing,which plays a sealing role.Under different cooling water,pressure pulsation in vaneless space appears rotor-stator interference phenomenon,and its main frequency is blade passing frequency.

关 键 词：水泵水轮机 调相运行 水环 两相流动 自由液面 

分 类 号：TV743[水利工程—水利水电工程] TV734