摘要
为了在转轮直径变化不大的基础上,提高斜击式水轮机的出力与比转速,在设计时往往采取增加喷嘴数,但喷嘴数的增加会引起转轮内部流动的相互干涉,降低机组效率。本文采用CFD技术对双喷嘴斜击式水轮机转轮内部流动进行数值模拟,通过水斗与喷嘴之间的相互流动计算结果分析,优化得出转轮斗叶数为20个时,双喷嘴斜击式水轮机最佳水斗木模型线,得到水斗接受射流全过程的速度、压力分布以及水流迹线,两个喷嘴同时作用时转轮内部流动的干涉情况。为斜击式水轮机的推广应用,电站运行提供参考依据。
In order to little change in runner diameter, based on Turgo turbines to increase the output and specific speed, often taken in the design of the nozzle to increase the number. However, the increasing nozzle will lead to mutual interference of internal flows of the runner, which reduces the efficiency of Turgo turbines. By using CFD technique, the internal flow of Turgo turbines number with double nozzles is numerically simulated in this paper. Through the calculation results of mutual flow between the bucket and the nozzle, optimized the bucket wooden model of the best lines for the double nozzle Turgo turbines, when the bucket of the runner reached 20. The velocity and pressure distribution and current path line of the bucket during the whole jet accepting process are obtained. The interference of internal tlow of the runner during the double nozzle are acting at the same time is obtained. All these expedited the popularization and application of Turgo turbines, and provide references for the practical operation ofhydropower station.
出处
《大电机技术》
北大核心
2010年第5期48-51,共4页
Large Electric Machine and Hydraulic Turbine
基金
四川省教育厅高等学校科技创新重大培育项目(09ZZ031)
关键词
斜击式水轮机
双喷嘴
斗叶
转轮
数值模拟
Turgo turbine
Double nozzle
Bucket
Runner
Numerical simulation
