Large Eddy Simulation of Francis Turbine Flow Fields under Small Opening Condition

Tao Guo; Jun Zhou; Xiao Nan Liu

doi:10.4028/www.scientific.net/AMM.444-445.281

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 444-445Large Eddy Simulation of Francis Turbine Flow...

Large Eddy Simulation of Francis Turbine Flow Fields under Small Opening Condition

Abstract:

The vibration intensity is strong in Francis turbine occurred under the small opening conditions, such as Lijia Gorges and Three Gorges project. In paper we use large eddy simulation (LES) method base on Vreman SubGrid-Scale model to study the generation and evolution process of turbulence flow, capturing the details of the flow structures and the dissipation of the turbulent kinetic energy. The SIMPIEC algorithm is applied to solve the coupled equation of velocity and pressure. The result shows that the small guide vane opening conditions deviate the optimal conditions most. So some unstable flow characters been induced. Such as the turbulent kinetic energy of fluid in guide vanes zone, the blade passage and the draft tube are very strong. The unstable flow phenomenon including the swirl, flow separation, interruption and vortex strip. It can be deduced that the vibration of unit is induced by these flow characteristic.

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Periodical:

Applied Mechanics and Materials (Volumes 444-445)

Pages:

281-285

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.444-445.281

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Online since:

October 2013

Authors:

Tao Guo, Jun Zhou, Xiao Nan Liu

Keywords:

Francis Turbine, Large Eddy Simulation, Small Opening Condition, Turbulent Flow

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