摘要
水泵水轮机的运行稳定性对抽水蓄能机组产生极大影响,为研究不同工况下水泵水轮机内部流态及压力脉动的详细特征,针对某一模型水泵水轮机,分析2种不同导叶开度下从较小流量到较大流量的内部流动和压力脉动。结果表明,小流量下活动导叶开度小时和大流量下活动导叶开度大时压力脉动较小,瞬时扬程的波动变化也小,流动平稳;小流量下活动导叶开度大时和大流量下活动导叶开度小时受到许多低频的影响,频率成分比较复杂,压力脉动幅值较大,瞬时扬程的波动也大,内部流动紊乱。
The operation stability of pump turbine has a great impact on the pumped storage units. When the flow rate decreases, unstable head variations occur. Unstable working conditions will lead to unsafe operation. In order to study the detailed characteristics of flow regime and pressure pulsation of pump-turbine under different operating conditions, the internal flow and pressure pulsation for a model pump-turbine under two different guide vane opening angles from low to large flow of flow rates were analyzed. As the guiding mechanism, the guide vanes had interference on the flow. The results of the investigation showed that under both low flow rate with small guide vane opening angle and large flow rate with large guide vane opening angle, the pressure pulsations were small. Pressure value fluctuations were also small and the flow was steady. On the contrary, the pressure pulsations were large under both low flow rate with large guide vane opening angle and large flow rate with small guide vane opening angle. However, it was affected by many low-frequency under low flow rate with large guide vane opening angle and large flow with small guide vane opening angle. The components of frequency were more complex. Pressure pulsation amplitude and head fluctuations were increased. The internal flow was disordered. The head also had obvious pulsation. All of the above resulted in the poor operation stability. It showed that the matching relationship between guide vane opening and flow affected the operation stability. All the results provided reliable reference for improving the stability of pump-turbine under off-design operations.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2016年第12期77-84,共8页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金项目(51139007)
关键词
水泵水轮机
非设计工况
内部流态
压力脉动
数值模拟
pump-turbine
off-design condition
internal flow regime
pressure pulsation
numerical simulation
