排灌机械工程学报2017，Vol.35Issue(6)：495-501,7.DOI:10.3969/j.issn.1674-8530.16.0243
水泵水轮机制动工况导叶区流动特性分析
Flow characteristic of guide vane region in turbine brakingoperation of pump-turbine
摘要
Abstract
To study the inner flow mechanism of pump turbine in the braking operation with vanes′ abnormal vibration, the numerical simulation was done with the SST k-ω turbulent model and SIMPLEC algorithm.The analyses of vane region′s flow and pressure fluctuation were done after comparing with the data from experiment.The results show that there exists wake structure after the guide vanes and stay vanes.There will be a loss of energy in the transformation between them and it could cause hydraulic vibration.There also exists impact loss in the inlet of guide vanes which increases the instability of guide vanes region.The instability of the flow in the guide vanes is further verified by the pressure fluctuation monitoring in the guide vanes region.Through the analyses of time domain and frequency domain characteristics, it shows that the relative amplitude has reached more than 3 times of normal working conditions of turbine mode and pump mode.The main frequency is the blade frequency withhigh amplitude.It is an intermediate frequency component which could cause resonance.The results can be used to guide the optimal design of the pump turbine.关键词
水泵水轮机/制动工况/导叶区/内流特性/稳定性Key words
pump turbine/braking operation/guide vane region/flow characteristics/stabilization分类
能源科技引用本文复制引用
李琪飞,刘萌萌,张建勋,刘谦,张震..水泵水轮机制动工况导叶区流动特性分析[J].排灌机械工程学报,2017,35(6):495-501,7.基金项目
国家自然科学基金资助项目(51566009) （51566009）
