Title :
Numerical study of francis turbine flow field under small opening condition
Author :
Yang Yaoyao ; Hongjie Wang ; Ruzhi Gong ; Xianzhu Wei ; Wanjiang Liu
Author_Institution :
Sch. of Energy Sci. & Eng., Harbin Inst. of Technol., Harbin, China
Abstract :
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 κ-ε model. Through an effective validation 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.
Keywords :
blades; computational fluid dynamics; hydraulic turbines; mechanical stability; numerical analysis; pumps; turbulence; CFD code FLUENT 6.2; CFD method; Francis turbine flow field; RNG k-ε model; blades; draft tube flow field; numerical study; reverse pump; turbine stability; vanes; vortices; Blades; Electron tubes; Hydraulic turbines; Numerical models; Numerical stability; Stability analysis; CFD; Francis Turbine; Small opening condition; Stability;
Conference_Titel :
Electronic and Mechanical Engineering and Information Technology (EMEIT), 2011 International Conference on
Conference_Location :
Harbin, Heilongjiang, China
Print_ISBN :
978-1-61284-087-1
DOI :
10.1109/EMEIT.2011.6023004
