转速对水泵水轮机压水调相运行水环流动的影响  

Effect of rotating speed on water-ring flow of pump-turbinein pressurized water phase modulation operation

作　　者：陈帅 陈振木 张文武 卢加兴 祝宝山[3] CHEN Shuai;CHEN Zhenmu;ZHANG Wenwu;LU Jiaxing;ZHU Baoshan(Chongqing Panlong Pumped Storage Co.,Ltd.,Chongqing 401452,China;Department of Mechanical and Electrical Engineering,Wenzhou University,Wenzhou,Zhejiang 325035,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory of Fluid Machinery and Engineering(Xihua University),Sichuan Province,Chengdu,Sichuan 610039,China)

机构地区：[1]重庆蟠龙抽水蓄能电站有限公司,重庆401452 [2]温州大学机电工程学院,浙江温州325035 [3]清华大学能源与动力工程系,北京100084 [4]流体机械及工程四川省重点实验室(西华大学),四川成都610039

出　　处：《排灌机械工程学报》2023年第1期16-21,31,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：浙江省自然科学基金资助项目(LQ21E090001);国家自然科学基金资助项目(51679122);国家电网公司科技基金资助项目(52573020000B);流体机械及工程四川省重点实验室(西华大学)开放项目(LTJX-2022004)。

摘　　要：为了研究水泵水轮机在调相工况下转速对水环流动的影响,应用ANSYS CFX软件对某中比转数水泵水轮机在调相工况下的水环流动特性进行全流道非定常数值计算,分析水泵水轮机在不同转速下(n=600,800,1000,1050 r/min)水环的压力脉动特性和流动特性.研究结果表明:无叶区水环的厚度与转速密切相关,转速越大,水环内自由液面的平均半径越大,水环厚度越薄;不同转速下无叶区内的压力脉动频率组成成分相同,主频均为由动静干涉作用引起的7 f n,且随着转速的增大主频的幅值增大,水环的流动速度增大;在相同转速下,无叶区周向压力脉动强度变化不明显,但在无叶区径向,越靠近转轮处压力脉动越小;转轮出口处有明显的气液分界面,整个转轮流道内充满气体,这表明水环对气体密封的效果良好.研究结果可为水泵水轮机调相工况运行提供一定参考.In order to study the influence of the rotating speed of the pump-turbine on the flow cha-racteristics of water-ring under the phase modulation condition,the ANSYS CFX software was used to simulate the unsteady flow characteristics of water-ring with medium-specific speed pump-turbine.The pressure fluctuation and internal flow characteristics of the water-ring were analyzed with rotating speed of 600,800,1000 and 1050 r/min.The results show that the thickness of the water-ring in the vaneless zone is closely related to the rotating speed.The larger the rotating speed,the larger average radius of the free surface in the water-ring,and the thinner the thickness of the water-ring.The composition pressure fluctuation frequency in the vaneless zone are the same at different rotating speeds,and the dominate frequency is 7 f n,which is caused by the interaction between rotor and stator.The amplitude of the dominate frequency increases with the increase of the rotating speed as well.The intensity of pressure fluctuation is almost the same in the circumferential direction.However,the pressure fluctuation becomes smaller as the location closer to the runner in the radial direction.There is an obvious gas-liquid interface near the runner outlet and the runner passage filled with air,which shows that the water-ring has a good effect on gas sealing.The research results can provide some reference for the operation of pump-turbine under phase regulation condition.

关 键 词：水泵水轮机 压水调相 水环 自由液面 压力脉动 

分 类 号：TK734[交通运输工程—轮机工程]