排灌机械工程学报2017，Vol.35Issue(7)：588-595,8.DOI:10.3969/j.issn.1674-8530.17.0025
水泵水轮机制动工况转轮受力分析
Analysis of forces on runner and blades of pump -turbine under braking condition
摘要
Abstract
In order to clarify force conditions on runner and blades under braking condition of pump -turbine,a model pump -turbine in a pumped storage power station was employed as a study object.A few steady and unsteady numerical simulations were carried out in braking mode at a selected opening of wicket gate,and their results were compared with the experimental data.The internal flow patterns under that condition were discussed,the blade loading and the radial force on the runner were analyzed quantitatively.The results show that the pressure difference across the blade pressure and suction sides near the blade leading edge is large under that condition,easily causing a disorder flow in this region. Both the pressure gradient and vorticity are significant at the blade leading and trailing edges as well as in the middle of blade suction side,the vortices generated in these regions can affect the flow in runner channels and impair the stability of the shaft and unit.The runner is subjected to an asymmetric radial force whose amplitude varies periodically,the number of cycles are equal to the number of blades,and the amplitude is ranged from 86.90 N to 133.18 N with a difference of 46.28 N.The double-rotation stall phenomenon appears in the runner,and the stalls can impact on blades intermittently,resulting in an additional alternating stress on the blades.Therefore,a pump-turbine should avoid running in the braking zone near the runaway line with positive slope when its operation mode is changing.关键词
水泵水轮机/制动工况/径向力/叶片载荷/旋转失速Key words
pump -turbine/braking mode/radial force/blade loading/rotation stall分类
能源科技引用本文复制引用
李琪飞,刘萌萌,刘谦,张震,张建勋..水泵水轮机制动工况转轮受力分析[J].排灌机械工程学报,2017,35(7):588-595,8.基金项目
国家自然科学基金资助项目(51566009) （51566009）
