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Three-Dimensional Simulation of Unsteady Flow in a Model Francis Hydraulic Turbine
作者姓名:邵奇  刘树红  吴玉林  吴伟章  陶星明
作者单位:[1]DepartmentofThermalEngineering,TsinghuaUniversity,Beijing100084China [2]HarbinInstiluteofLargeElectricMachinery,Harbin150040,China
基金项目:SupportedbytheNationalNaturalScienceFoundationofChina(No.50176022)
摘    要:For Francis hydraulic turbines, unsteady flow caused by vortex ropes in the draft tube leads to a problem of stability in operation. The unsteady flow field ef a model Francis hydraulic turbine was simulated under part-load operation. A sliding mesh model was used to calculate a time-accurate solution for the strong rotor-stator interactions between the runner and guide vanes, and the draft tube. Based on threedimensional incompressible Reynolds averaged Navier-Stokes equations and on a renormalization group k-ε turbulence model, spatial discretizatien was obtained by using the finite volume method with unstructured grid elements, and a second order fully implicit scheme was applied for time. Pressure fluctuations in the draft tube were recorded and analyzed via a fast Fourier transform calculation. The results were compared with the experimental data, and shew that the vertex rope in the draft tube and the induced pressure fluctuations are well simulated.

关 键 词:水轮机  设计  三维空间模拟  计算机模拟  非稳定流

Three-Dimensional Simulation of Unsteady Flow in a Model Francis Hydraulic Turbine
SHAO Qi,LIU Shuhong,WU YulinWU Weizhang,TAO Xingming.Three-Dimensional Simulation of Unsteady Flow in a Model Francis Hydraulic Turbine[J].Tsinghua Science and Technology,2004,9(6):694-699.
Authors:SHAO Qi  LIU Shuhong  WU YulinWU Weizhang  TAO Xingming
Institution:SHAO Qi,LIU Shuhong,WU YulinWU Weizhang,TAO XingmingDepartment of Thermal Engineering,Tsinghua University,Beijing 100084,China, Harbin Institute of Large Electric Machinery,Harbin 150040,China
Abstract:For Francis hydraulic turbines, unsteady flow caused by vortex ropes in the draft tube leads to a problem of stability in operation. The unsteady flow field of a model Francis hydraulic turbine was simulated under part-load operation. A sliding mesh model was used to calculate a time-accurate solution for the strong rotor-stator interactions between the runner and guide vanes, and the draft tube. Based on three-dimensional incompressible Reynolds averaged Navier-Stokes equations and on a renormalization group k-?turbulence model, spatial discretization was obtained by using the finite volume method with unstructured grid elements, and a second order fully implicit scheme was applied for time. Pressure fluctuations in the draft tube were recorded and analyzed via a fast Fourier transform calculation. The results were compared with the experimental data, and show that the vortex rope in the draft tube and the induced pressure fluctuations are well simulated.
Keywords:computer simulation  rotor-stator interaction  unsteady flow  vortex rope  Francis hydraulic turbine
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