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Head loss coefficient of orifice plate energy dissipator

机译：孔板消能器的水头损失系数

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摘要

Orifice plates as an effective energy dissipator have been used in hydropower projects. The head loss coefficient, relating directly to the energy dissipation ratio, is an important index of these elements. This coefficient and parameters such as the contraction ratio of the orifice plate diameter and the flood discharge tunnel diameter, the ratio of the orifice plate thickness to the tunnel diameter, the dimensionless recirculation length and the Reynolds number were theoretically analysed, and relationships were obtained by numerical simulations and physical model experiments. The head loss coefficient is mainly dominated by the contraction ratio and the ratio of the orifice plate thickness by the effects of the recirculation region. The less the contraction ratio of the orifice plate, the larger the recirculation length and height, and the larger the head loss coefficient. An empirical expression allows us to determine the head loss coefficient.
机译：孔板作为一种有效的消能器已在水电项目中使用。水头损失系数直接与能量耗散率有关，是这些元素的重要指标。从理论上分析了孔板直径与排洪隧道直径的收缩率，孔板厚度与隧道直径之比，无因次再循环长度和雷诺数等系数和参数，并通过数值模拟和物理模型实验。压头损失系数主要受收缩率和受再循环区域影响的孔板厚度比的支配。孔板的收缩率越小，再循环长度和高度越大，压头损失系数越大。一个经验表达式使我们能够确定水头损失系数。

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  • 来源
    《Journal of hydraulic research》 |2010年第4期|p.526-530|共5页
  • 作者

    WU JIANHUA; AI WANZHENG; ZHOU QI;

  • 作者单位

    College of Water Conservancy and Hydropower Engineering,Hohai University, 1 Xikang Road, Nanjing 210098, People's Republic of China;

    rnCollege of Water Conservancy and Hydropower Engineering, Hohai University,People's Republic of China;

    rnCollege of Water Conservancy and Hydropower Engineering, Hohai University,People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    contraction ratio; energy dissipator; head loss coefficient; orifice plate; recirculation;

    机译：收缩率耗能器头部损失系数孔板再循环;

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