Cavitation study of a pump-turbine at turbine mode with critical cavitation coefficient condition

7th International Conference on Pumps and Fans

机械制造;工业技术

Wang, J.^1 ; Yang, D.^1 ; Xu, J.W.^1 ; Liu, J.T.^2 ; Jiao, L.^2

Institute of Naval Architecture and Ocean Engineering, Zhejiang University, China^1

Beijing Institute of Control Engineering, Beijing, China^2

关键词: Blade Surface;    Cavitating flow;    Cavitation flow;    Cavitation model;    Cavitation phenomenon;    Pump-turbines;    Static pressure;    Turbine modes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/129/1/012037/pdf
DOI  :  10.1088/1757-899X/129/1/012037

学科分类：工业工程学

来源: IOP

【 摘 要 】

To study the cavitation phenomenon of a pump-turbine at turbine mode when it ran at the critical cavitation coefficient condition, a high-head model pump-turbine was disperse using hexahedron grid. Three dimensional, steady cavitating flow was numerically studied using SST k-ω model. It is confirmed that ZGB cavitation model and SST k-ω model are useful ways to study the two-phase cavitation flow in pump-turbine. Mass flow inlet and pressure outlet were specified at the casing inlet and draft tube outlet, respectively. The static pressure was set according to the cavitation coefficient. The steady cavitating flows at critical cavitation coefficient condition were analysed. The cavitation area in the runner was investigated. It was found that the pressure of the suction on the blade surface was decreasing gradually with the decrease of the cavitation coefficient. In addition, the vortex flow in the draft tube was observed at the critical cavitation coefficient. It was found that the vortex flow appeared at the center of the draft tube inlet with the decreasing of the cavitation coefficient. Compared with the experimental data, the simulation results show reasonable agreement with the experimental data.