Advanced spiral case with exact axi-symmertric flow for high-head pump-turbine

作者：He, Xiao-Lin; Han, Feng-Qin; Zhan, Qiao-Yue; Shen, Na; Kubota, Takashi

来源：Journal of Engineering Thermophysics, 2010, 31(SUPPL.): 157-160.

• Axi-symmetric flows
• Pump-turbines
• Spiral case
• Stay vanes
• Uniform circulation

So far, the spiral case of conventional reaction turbines was designed to distribute the uniform through flow circumferentially from the nose to the end of stay vanes. As a result, the flow circulation γ (=RV u) at the stay vane inlet was not sufficiently uniform circumferentially, and axi-asymmetric flow was supplied toward guide vanes and runner. Since the high-head pump-turbine must be operated under the off-designed condition, the axi-asymmetric flow may amplify the unsteady hydraulic performances such as S-shape characteristics and the negative gradient H-Q curve, etc. The paper proposed how to design the advanced spiral case with stay vanes for high-head pump-turbine in order to supply the exactly uniform axi-symmetric flow toward runner.

• 出版日期2010-12
• 单位华南理工大学