水利学报2017，Vol.48Issue(7)：837-845,9.DOI:10.13243/j.cnki.slxb.20170001
水泵水轮机泵工况旋转失速压力脉动特性及转动机理
Pressure fluctuations characteristics and rotating stall propagation mechanism of a pump-turbine in pump mode
摘要
Abstract
The pump-turbines have to be operated under off-design conditions to maintain the stability of the grid.The rotating stall usually occurs at part load in pump mode,which can cause severe pressure fluctuations and strong vibrations.To understand the pressure fluctuations and the stall cells propagation mechanism within turbine,the Scale adaptive simulation (SST-SAS) turbulence model and unsteady RANS approach were adopted to simulate a mode pump-turbine with different flow rate.The results show that the simulated characteristics curves are in good agreement with the experiment results.The rotating stall occurs in the region from 40％ to 80％ of the best efficiency point (BEP) flow rate.The stall cells rotating along the circumference and their rotating frequency is 3.3％ ～ 8.1％ of the runner rotating frequency.The propagation of the stall cells is driven by the growth and the decay of the stall cell.The pressure gradient between the stalled and un-stalled channels make the fluids flow from the stalled channel into the un-stalled channel through the gap between the corresponding guide vane and stay vane,which will increase the flow separations in the un-stalled channel.The growth of flow blockage in the un-stalled channel will make the inflow deviate toward the downstream channel and pressure decrease around the leading edge of the guide vane suction side.Further,the adverse pressure gradient between the leading and the trailing edges of the un-stalled guide vane is enhanced.Consequently,the flow blockage continues to grow until the vortices occupy the entire un-stalled channel.关键词
水泵水轮机/旋转失速/水泵工况/数值模拟/压力脉动Key words
pump-turbine/rotating stall/pump mode/numerical simulation/pressure fluctuations分类
建筑与水利引用本文复制引用
张春泽,夏林生,刁伟,周家俞..水泵水轮机泵工况旋转失速压力脉动特性及转动机理[J].水利学报,2017,48(7):837-845,9.基金项目
国家自然科学基金面上项目(51579187) （51579187）
重庆市基础与前沿研究计划项目(cstc2016jcyjA1935,cstc2016jcyjA1937) （cstc2016jcyjA1935,cstc2016jcyjA1937）
重庆市教委科学技术研究项目(KJ1600514,KJ1600535) （KJ1600514,KJ1600535）
重庆交通大学内河航道整治技术交通行业重点实验室开放基金重点项目(NHHD-201501,NHHD-201505,NHHD-201513) （NHHD-201501,NHHD-201505,NHHD-201513）
