排灌机械工程学报2011，Vol.29Issue(1)：1-5,5.DOI:10.3969.j.issn.1674-8530.2011.01.001
水泵水轮机水轮机制动区的流动特性
Flow characteristics of pump-turbine at turbine braking mode
摘要
Abstract
To study the instability characteristics of pump-turbine at turbine braking mode, a hydraulic model was established based on a pumped storage power station. The SST k -ω model and SIMPLEC algorithms were used to simulate the internal flow fields and external characteristics at turbine braking condition. Compared with the experimental data, the simulation results were examined. The results show that the head changes is small as flow rate changes in turbine braking condition. Higher rotating speed is needed to get into the braking mode as the opening of guide vanes increase. The pump turbine can be prevented from running into braking mode by adjusting the opening of guide vanes. Flow is regular and there is no vortex structure at zero moment point when guide vanes at operating opening. There have lots of periodical distribution vortexes in inlet of blades and guide vanes as well as the region between guide vanes and stay vanes with flow rate decreased. The vortexes in runner are caused by large forward inclination of blade, while vortexes in guide vanes are due to the angle of attack between flow direction and guide vanes. These conclusions can provide a theory basis for optimal design for pump-turbine.关键词
水泵水轮机/制动工况/数值模拟/SST k-ω模型/流动特性Key words
pump-turbine/ turbine braking mode/ numerical simulation/ SST k - ω model/ flow characteristics分类
农业科技引用本文复制引用
王乐勤,刘锦涛,梁成红,焦磊..水泵水轮机水轮机制动区的流动特性[J].排灌机械工程学报,2011,29(1):1-5,5.基金项目
国家自然科学基金资助项目(50979095/E090603) （50979095/E090603）
