Journal of South China University of Technology (Natural Science Edition) ›› 2006, Vol. 34 ›› Issue (4): 75-79,90.

• Power & Electrical Engineering • Previous Articles     Next Articles

Mechanism of Unsteady Free W ater Sheet Flow on Bucket Surface

Xiao Ye-xiang  Han Feng-qin  Kubota Takashi   

  1. College of Electric Power,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2005-11-01 Online:2006-04-25 Published:2006-04-25
  • Contact: 肖业祥(1978-)，男，博士生，主要从事流体机械数值仿真及优化设计等研究。 E-mail:challengexiao@tom.com
  • About author:肖业祥(1978-)，男，博士生，主要从事流体机械数值仿真及优化设计等研究。
  • Supported by:

    国家自然科学基金资助项目(50379015)

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Abstract:

The unsteady free water sheet flow in the rotating bucket of a Pehon turbine is a very complex flow that cannot be accurately simulated for lack of a numerical method.In order to solve this problem.the mechanism of unsteady water sheet flow is analyzed in this paper,and the,differential equation describing the relative motion con-trol of fluid particles on the bucket surface is deduced according to the Navier.Stokes equation in the rotating coordi-nate system.Then,a numerical analytical software is deveh)ped based on the proposed equation,which is finally applied to the numerical simulation of the water sheet flow in the rotating bucket,thus quantitatively obtaining the flow velocity and energy distributions of a model turbine.By comparing water sheet flows obtained by various experiments and simulations,it is concluded that the simulated results basically accord with the experimental ones,with an eror in hydraulic efficiency of 0.33% in the optimum operation condition.

Key words: pelton bucket, free water sheet flow, flow mechanism, numerical simulation, performance