Numerical simulation of hydraulic force on the impeller of reversible pump turbines in generating mode

• Published in: Journal of hydrodynamics. Series B Vol. 29; no. 4; pp. 603 - 609
• Main Author: 李金伟 张宇宁 刘凯华 冼海珍 于纪幸
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.08.2017; Springer Singapore; China Institute of Water Resources and Hydropower Research, Beijing 100048, China%Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, North China Electric Power University, Beijing 102206, China; Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China%Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, North China Electric Power University, Beijing 102206, China
• Subjects: backflow; Engineering; Engineering Fluid Dynamics; generating mode; hydraulic force; Hydrology/Water Resources; Numerical and Computational Physics; numerical simulation; Pump turbine; Simulation; vortex; 制动模式; 可逆式水泵水轮机; 叶轮; 抽水蓄能电站; 数值模拟; 水力; 水轮发电机组; 轴向力; generating mode; vortex; Pump turbine; backflow; numerical simulation; hydraulic force
• ISSN: 1001-6058; 1878-0342
• DOI: 10.1016/S1001-6058(16)60773-4

The hydraulic force on the reversible pump turbine might cause serious problems（e.g., the abnormal stops due to large vibrations of the machine）, affecting the safe operations of the pumped energy storage power plants. In the present paper, the hydraulic force on the impeller of a model reversible pump turbine is quantitatively investigated through numerical simulations. It is found that both the amplitude of the force and its dominant components strongly depend on the operating conditions（e.g., the turbine mode, the runaway mode and the turbine brake mode） and the guide vane openings. For example, the axial force parallel with the shaft is prominent in the turbine mode while the force perpendicular to the shaft is the dominant near the runaway and the turbine brake modes. The physical origins of the hydraulic force are further revealed by the analysis of the fluid states inside the impeller.