Simulation on Balde Duct Vortex in a Francis Turbine Runner Based on S-A Model

Yong Zhong Zeng; Xiao Bing Liu

doi:10.4028/www.scientific.net/AMM.444-445.476

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 444-445Simulation on Balde Duct Vortex in a Francis...

Simulation on Balde Duct Vortex in a Francis Turbine Runner Based on S-A Model

Abstract:

If deviating from the optimal operation conditions, flow separation will occur on the blade of the runner in a low specific speed turbine. At this time, the turbulent flow of flow field in the blade duct will be in a strong non-equilibrium state, and thus the blade duct vortexes will be generated. To further study the mechanism of blade duct vortexes and to control the generation of these vortexes, Spalart-Allmaras (S-A) model was used to numerically simulate and calculate the internal flow in the low specific speed turbine runner under low load conditions. The blade duct vortexes in the turbine runner were accurately predicted. The effect of short blade in eliminating and reducing the vortexes in the low specific speed turbine runner was analyzed and compared.

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Periodical:

Applied Mechanics and Materials (Volumes 444-445)

Pages:

476-478

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.444-445.476

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Online since:

October 2013

Authors:

Yong Zhong Zeng, Xiao Bing Liu

Keywords:

Blade Duct Vortex, Low Specific Speed, Spalart-Allmaras Model, Turbine

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