Experiments and numerical simulations of a flow instability in a low-specific-speed pump-turbine

29th IAHR Symposium on Hydraulic Machinery and Systems

Matsumura, Koichiro^1 ; Yokota, Kazuhiko^1 ; Tsuru, Wakana^1 ; Kang, Donghyuk^2 ; Sugiyama, Hayate^1

Department of Mechanical Engineering, Aoyama Gakuin University Fuchinobe, 5-10-1 Chuou-ku, Kanagawa, Sagamihara

252-5258, Japan^1

Department of Mechanical Engineering, Saitama University, Shimokubo 255, Sakura-ku, Saitama

338-8570, Japan^2

关键词: Characteristic curve;    Flow oscillations;    Low specific speed pumps;    Pressure fluctuation;    Pressure oscillation;    Pump-turbines;    Stall;    Surging;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/7/072042/pdf
DOI  :  10.1088/1755-1315/240/7/072042

来源: IOP

【 摘 要 】

In order to clarify the mechanism of the fluid oscillation, which occurs for a shut-down sequence of a pump-turbine, the experiment and numerical simulation of the pump-turbine were performed. The pressure fluctuation is measured at inlet, outlet and four points between the runner and guide vanes. Parameters are flow rate, rotating speed and guide vane opening ratio. Results show that the characteristic curve shows so-called "S-shaped" and the pressure oscillation occurs in the "S-shaped" region.