Analysis of CFD for the Vortex Rope in the Draft Tube Urged by the Long and Short Blades Runner

Si Qing Zhang; Chang Zhen Li; Li Xiang Zhang; Xiao Xu Zhang

doi:10.4028/www.scientific.net/AMM.105-107.52

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 105-107Analysis of CFD for the Vortex Rope in the Draft...

Analysis of CFD for the Vortex Rope in the Draft Tube Urged by the Long and Short Blades Runner

Abstract:

The RNG turbulence model is used to carry out the 3D steady turbulent calculation on the runner and draft tube of the Francis turbine. And the prototype of the Francis turbine is HLA351. Under 8 typical operating conditions, numerical simulation on how the runner outlet urge the vortex rope in draft tube are accomplished in this paper, and the calculation models are long blade model and mixed blade model. The results show that the runner outlet of the mixed model can lead the vortex rope location to the downstream relatively, reduce the circumfluence and cushion area and the probability of the second-vortex. What’s more, the flow pattern in mixed model is superior to the long model and that benefits the operation stability and economy of the unit.

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Periodical:

Applied Mechanics and Materials (Volumes 105-107)

Pages:

52-55

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.105-107.52

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Online since:

September 2011

Authors:

Si Qing Zhang, Chang Zhen Li, Li Xiang Zhang, Xiao Xu Zhang

Keywords:

Change of Vortex Rope, Flow Pattern of Draft Tube, Water Encouragement

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