转轮-导叶不同匹配下的内部流动特性分析  

Flow characteristic analysis under different runner-vane-match

作　　者：王正伟[1] 喻疆[1] 罗永要[1] 周凌九[2] 

机构地区：[1]清华大学热能工程系,北京100084 [2]中国农业大学水利与土木工程学院,北京100085

出　　处：《水力发电学报》2005年第3期44-47,共4页Journal of Hydroelectric Engineering

摘　　要：某电站一混流式转轮在模型试验中性能均达到设计要求,在实际电站使用中采取了与模型试验不同的导叶与之匹配,出现出力不足现象。本文针对这一现象,采用SIMPLEC算法及RNGk ε模型对整个流道进行三维粘性流动计算,分析原因,并根据实际情况在原型基础上对转轮进行深入优化,以流场数值模拟预测流动性能,不再进行模型试验。优化后转轮经电站实际运行后,表明其性能达到了预期要求。In the case of a Francis turbine of a certain hydro-power station, it is performed satisfactorily to the design requirements in the model experiment, while in the actual operation with different guide vane types, it could not produce enough power. By algorithm of SIMPLEC and model of RNG k-ε, the three-dimensional viscous flow is calculated for the whole flow channel. The runner is optimized on the basis of the prototype according to the practice, and the result of performance is predicted by replacing the model experiment with the numerical simulation of the flow-field. The optimized reformed runner is proved to reach the design requirement, it is proved that the idea and method presented in the paper are feasible.

关 键 词：混流式转轮 性能预测 电站改造 计算仿真 

分 类 号：TK730.2[交通运输工程—轮机工程]