Numerical Study of Francis Turbine Flow Field under Small Opening Condition
In order to study the cause of Francis turbine abnormal oscillation under small opening condition, CFD method was adopted to analyze the flow filed and its impact on turbine stability. Numerical simulation was performed on the commercial CFD code FLUENT 6.2, using RNG k-ε model. Through an effective alidation of the computation result and detailed flow analysis, the paper showed vortices existed in runner and draft tube flow field, abnormal pressure distribution on blades and vanes, and reverse flow in guide vanes under reverse pump condition. The result shows that the unstable flow under small opening condition leads to an increase of turbine instability, and is one possible reason of the abnormal oscillation.
Francis Turbine CFD Small opening condition Stability
Yang Yao Hongjie Wang Ruzhi Gong Xianzhu Wei Wanjiang Liu
School of Energy Science and Engineering Harbin Institute of Technology Harbin, P. R. China Harbin Institute of Large Electrical Machinery Harbin, P. R. China
国际会议
哈尔滨
英文
1675-1678
2011-08-12（万方平台首次上网日期，不代表论文的发表时间）