摘要
为了提高冲击式水轮机的出力与比转数,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技术对六喷嘴冲击式水轮机转轮内部流动进行数值模拟,通过水斗数与喷嘴数之间的相互流动计算结果,优化出六喷嘴冲击式水轮机在转轮斗叶数为21个时,正好与喷嘴数相匹配,得到单个水斗接受射流全过程的速度、压力分布以及水流迹线,多个喷嘴同时作用时转轮内部流动的干涉情况。
In order to increase the output and specific speed of Pelton turbines, the method of increasing nozzle number is usually adopted. However, the increasing nozzle will lead to mutual interference of internal flows of the runner, which reduces the efficiency of Pelton turbines. By using CFD technique, the internal flow of Pelton turbines runner with six nozzles was numerically simulated. Through the calculation results of mutual flow between bucket number and nozzle number, we found that 21 buckets for runner in Pelton turbines with six nozzles was matching with the nozzle number. The velocity and pressure distribution and current path line of single bucket during the whole jet accepting process have been obtained. The interference of internal flow of the runner during the multi-nozzle acting at the same time has been obtained as well. All these provided references for the practical operation of hydropower station.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2008年第10期71-75,共5页
Transactions of the Chinese Society for Agricultural Machinery
基金
四川省教育厅重点资助项目(项目编号:2006A089)
关键词
冲击式水轮机
多喷嘴
斗叶
数值模拟
Pelton turbine, Multi-nozzle, Bucket, Numerical simulation
