不同空化数下水泵水轮机相关特性数值计算与分析  

Analysis of Correlation Characteristics of Pump-turbine under Different Cavitation Numbers

作　　者：李琪飞[1,2] 陈祥玉 孟庆 蔡婷 周峰 魏显著 LI Qifei;CHEN Xiangyu;MENG Qing;CAI Ting;ZHOU Feng;WEI Xianzhu(School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of Fluid Machinery and Systems,Gansu Province,Lanzhou 730050,China;Harbin Institute of Large Electric Machinery,Harbin 150040,China)

机构地区：[1]兰州理工大学能源与动力工程学院,兰州730050 [2]甘肃省流体机械及系统重点实验室,兰州730050 [3]哈尔滨大电机研究所,哈尔滨150040

出　　处：《农业机械学报》2020年第1期130-138,共9页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(51566009)

摘　　要：为了研究不同空化数下的空化特性,以某抽水蓄能电站水泵水轮机作为研究对象,采用SST k-ω湍流模型和Zwart空化模型对不同空化数下的全流道进行了非定常数值计算,并且结合实验结果进行了对比验证。分析了不同空化数下中间流面的湍动能分布和空泡在叶片上的分布规律,探讨了空泡分布区域与转轮内叶道涡之间的相互关联。研究结果显示:水泵水轮机在泵工况下运行时,其无叶区有较明显的湍动能存在,并且湍动能分布比较明显,呈现出不规则的环状分布;叶片的空泡分布主要在叶片的吸力面,且叶片吸力面的湍动能高于压力面;转轮内部的叶道涡主要产生在靠近叶片吸力面且靠近转轮出口处,叶道涡的大小和数量与叶片上的空泡分布存在一定的相关关系,空泡的产生导致了流道的不畅,加剧了涡的产生。Aiming to study the cavitation characteristics under different cavitation numbers based on the pump-turbine of a pumped-storage power station,the SST k-ωturbulence model and the Zwart cavitation model were used to calculate the full flow path under different cavitation numbers.The unsteady numerical calculations were carried out and compared with the experimental results.The turbulent kinetic energy distribution of the intermediate flow surface and the distribution of cavitation on the blades under different cavitation numbers were analyzed.The correlation between cavitation distribution area and the runner inner channel vortices were discussed.The results showed that when the pump-turbine was operated under pump conditions,its vaneless had obvious turbulent kinetic energy,and the turbulent energy distribution was obvious,showing an irregular ring shape distributed.The bubble distribution of the blade was mainly on the suction surface of the blade,and the turbulent energy of the suction surface of the blade was higher than that of the pressure surface.The vortex inside the runner was mainly generated near the exit of the runner,and close to the suction surface of the blade.The size and number of vortices had a certain relationship with the distribution of bubble on the blades.The generation of bubble led to the poor flow path and exacerbated the generation of vortices.

关 键 词：水泵水轮机 空化 叶道涡 数值计算 

分 类 号：TK734[交通运输工程—轮机工程]