华南理工大学学报(自然科学版) ›› 2006, Vol. 34 ›› Issue (4): 75-79,90.

• 动力与电气工程 • 上一篇    下一篇

非定常水斗表面自由水膜的流动机理

肖业祥 韩凤琴 久保田乔   

  1. 华南理工大学 电力学院,广东 广州 510640
  • 收稿日期:2005-11-01 出版日期:2006-04-25 发布日期:2006-04-25
  • 通信作者: 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
  • 作者简介: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。
  • 基金资助:

    国家自然科学基金资助项目(50379015)

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)

摘要: 冲击式水轮机水斗内非定常自由水膜的流动非常复杂,至今还没有足够精确的数值方法来模拟这种流动.文中分析了非定常水膜流的流动机理,根据N-S方程推导出了水斗表面流体粒子在转动坐标系中的相对运动控制微分方程,依据控制微分方程编写出了数值解析软件并对水斗内的水膜流动进行了数值模拟,定量地得到了某模型水轮机水斗内部流动的速度场、能量场.对比一系列水膜流态分布,数值解析得到的结果与试验观测结果基本相吻合,最优工况下的水力效率与模型试验数据的误差为0.33% .

关键词: 水轮机水斗, 自由水膜流, 流动机理, 数值模拟, 性能

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