可逆式水轮机变工况研究  

Research on Variable Work Conditions of Pump Turbine

作　　者：李琪飞[1] 李仁年[1] 黄祺[1] 吕文娟[1] 郭树熊[1] 

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050

出　　处：《新技术新工艺》2013年第1期16-19,共4页New Technology & New Process

基　　金：国家自然科学基金资助项目(51079066)

摘　　要：针对抽水蓄能电站稳定性的要求,利用可逆式水轮机水泵工况断电过程中蜗壳出水边的压力始终保持恒定(水轮机工况的水头),机组转速连续变化这一规律,根据转速的不同来选取不同的工况点。在Fluent软件中,通过变换转轮的边界条件设置,可模拟可逆式水轮机水泵断电过程不同工况点水力变化,计算时采用雷诺时均方程和RNGk-ε湍流模型,压力和速度耦合采用半隐式(SIMPLEC)算法。对可逆式水轮机不同工况点模拟结果进行了分析总结,数值试验结果直观地反映了可逆式水轮机水泵工况断电的不同工况点、叶片表面的压力分布、蜗壳内部的流场漩涡分布、水力损失等,对可逆式水轮机的转轮设计和结构优化有一定的应用价值。According to the disciplinary of pressure of yielding water on the volute keeps constant（ the head of work con- dition for the hydraulic generator） and the generator unit continually changes during the transition from electricity goes off at pump working for the pump-turbine, the different work conditions can be chose with the difference of rotation speed in light of the requirement of transient process of pumped-storage hydroplant. The rotation set-up of the runner was changed in the software of Fluent, and finally the purpose of imitating the changes of waterpower in the different work conditions during transition stage for the reversible turbine can be realized. The Reynolds time averaged equation and RNG k-e turbulence mode were used in the calculations. The implicit（SfMPLEC） method was used for the coupling of pressure and velocity. The imitation results for different work conditions for the reversible turbine were analyzed and concluded in details. The re- suits directly indicated that the pressure distribution on the blade surface, flow-field swirl distribution in the volute, and the hydraulic loss during the transition from electricity goes off at pump working for the pump-turbine. It is applied valuable for the runner design and structure optimization of pump-turbine.

关 键 词：可逆式水轮机 数值模拟 结构优化 SIMPLEC算法 

分 类 号：TK05[动力工程及工程热物理]