The method of CFD is adopted to carry out 3-D unsteady turbulent flow simulation through the whole flow passage of 2# Francis turbine in Wanjiazhai hydropower station. The flow fields of spiral casing, stay vane, guide vane, runner, and tail tube are obtained. The pressure fluctuation of tail tube is also acquired and compared with the prototype test results in time domain and frequency domain. It shows that the numerical results and the experimental results are well identical. On the base, the problems of load distribution in the couple boundary between flow field of turbine and structure field of house and of hydraulic load transferring to machinery foundation by shaft are investigated. Consequently it achieves dynamic analogy of hydraulic load in hydropower house FEM analysis successfully. It provides method of analyzing hydropower house vibration accurately.

Volume Subject Area:
11th International Symposium on Advances in Numerical Modeling of Aerodynamics and Hydrodynamics in Turbomachinery
Keywords:
hydropower station, CFD, FEM, unsteady flow, vibration analysis
Topics:
Computational fluid dynamics, Finite element methods, Finite element model, Francis turbines, Hydroelectric power stations, Hydropower, Vibration
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