基于CFD的高水头水泵水轮机空化性能研究  

Study on Cavitation Performance of High Water-Head Pump Turbine Based on CFD

作　　者：李刚 侯为林 王浩 秦鸿哲 朱国俊[2] LI Gang HOU Weilin WANG Hao QIN Hongzhe ZHU Guojun(Henan Baoquan Pumped Storage Co., LTD, Xinxiang 453636, Henan, China Xi＇an University of Technology, Xi＇an 710048, Shaanxi, Chian)

机构地区：[1]河南国网宝泉抽水蓄能有限公司,河南新乡453636 [2]西安理工大学,陕西西安710048

出　　处：《电网与清洁能源》2017年第4期131-136,共6页Power System and Clean Energy

基　　金：国家自然科学基金项目(51479166)~~

摘　　要：由于高水头水泵水轮机的运行水头(扬程)和流量变幅大,水流流经转轮叶片时流速高,机组运行工况复杂多变,比常规水轮机更易发生空蚀。因此,进行高水头水泵水轮机空化特性的CFD数值模拟分析。首先对水轮机工况的几个工况点进行数值模拟,并与试验结果进行比较,验证了数值模拟的可靠性。其次分别对水轮机工况和水泵工况进行空化流动计算。计算结果表明,水轮机工况的空化主要发生在叶片和尾水管处;水泵工况的空化主要发生在转轮叶片上,吸力面空化比压力面严重。随着进口压力的不断降低,空化程度也越来越严重。As the pump turbine in high head pumped storage power station operates with a large variation range of head and flow, the flow speed of the water flowing through the runner blade is high, and the operation condition of the unit is more omplicated, thus the pump turbine is more likely to have cavitation than the conventional turbine. To this end, this paper carties on the CFD numerical simulation analysis of cavitation char-acteristics of the high head pump turbine. Firstly, several working conditions of the hydraulic turbine are simulated numerically, and the reliability of the numerical simulation is verified by comparing with the experimental results. Secondly, the cavitation flow of the turbine and the pump are calculated. The calculation results show that the cavitation of turbine conditions mainly occurs on the suction side of runner blades and the draft tube while the cavitation of the pump conditions mainly occurs on the runner blade. It is found that the suction side of the blade is more serious than the pressure side. With the decrease of the inlet pressure, the degree of cavitation becomes more and more serious.

关 键 词：水泵水轮机 数值模拟 空化 气体体积分数 

分 类 号：TK734[交通运输工程—轮机工程]