混流式水轮机改造性能优化预测  

Performance Optimization Prediction for Reformation of Francis Turbine

作　　者：雷恒 刘子祺[3] 高新江 赵青 孙见波[5] LEI Heng;LIU Zi-qi;GAO Xin-jiang;ZHAO Qing;SUN Jian-bo(Engineering Technology Research Center of Small Watershed Conservancy University of Henan Province,Kaifeng 475004,Henan Province,China;Yellow River Conservancy Technical Institute,Kaifeng 475004,Henan Province,China;Yellow River Xiaolangdi Water Recourse Investment Co.,Ltd.,Zhengzhou 450003,Henan Province,China;Sinohydro Bureau 5 Co.,Ltd,Chengdu 610065,Sichuan Province,China;National Rural Electrification Institute,Hangzhou 310032,Zhejiang Province,China)

机构地区：[1]小流域水利河南省高校工程技术研究中心,河南开封475004 [2]黄河水利职业技术学院,河南开封475004 [3]黄河小浪底水资源投资有限公司,郑州450003 [4]中国水利水电第五工程局有限公司,成都610065 [5]水利部农村电气化研究所,杭州310032

出　　处：《中国农村水利水电》2021年第12期167-170,共4页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(51709125);河南省高等学校青年骨干教师培养计划项目(2019GGJS105)。

摘　　要：针对部分老旧混流式水轮机无最新转轮匹配的状况,拟定改造比选方案,通过局部改造优化,设定转轮边界条件,采用N-S雷诺时均方程和标准k-ε双方程,建立混流式水轮机过流通道水力特性模型。基于CFD三维仿真,得到改造方案中活动导叶(固定导叶)、转轮内部的流速和压力分布,对比分析各方案在不同工况下的流场,预测水轮机性能,提出优化建议。通过工程实例表明,改造后水轮机效率平均提高6%~8%,出力平均提高2%~3%,水轮机内部流动特性改善,过流部件空蚀程度减轻,运行稳定性提高,为类似水轮机改造提供一定的借鉴参考。Aiming at part of the old Francis turbines are not matched with the latest runner,formulate the transformation and comparison scheme,the hydraulic characteristic model of the flow passage of Francis turbine is established according to the Reynolds averaged N-S equation and standard k-εequation through local transformation and optimization and set the boundary conditions of the runner.The velocity and pressure distribution of movable guide vane(fixed guide vane)and inner runner in the transformation scheme were obtained based on CFD three-dimensional simulation.The flow field of each scheme under different working conditions was compared and analyzed to predict turbine performance and put forward optimization suggestions.The engineering example indicates that the efficiency of the turbine increases 6%~8%and the output increases 2%~3%.The internal flow characteristics and the operation stability of the turbine are improved,the degree of cavitation erosion of the flow parts is reduced.The research results have a certain reference for the transformation of the similar turbine.

关 键 词：混流式水轮机 流场分析 仿真 改造优化 压力 速度 

分 类 号：TV734.4[水利工程—水利水电工程]