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首页> 外文学位 >Influence of expanded metal screen cross-sectional coverage of a wind tunnel on downstream turbulent flow.
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Influence of expanded metal screen cross-sectional coverage of a wind tunnel on downstream turbulent flow.

机译：风洞的扩展金属筛网横截面覆盖率对下游湍流的影响。

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摘要

A numerical and experimental study of turbulent flow through and around expanded metal screens partially covering the cross-section of a low turbulence wind tunnel was accomplished. Expanded metal screens are used within pulverized coal-fired utility boilers to counteract the erosive action of fly-ash particles by reducing excessive particle-laden flue-gas velocities and by redistributing the fly-ash particle concentration.;Three screen types at three screen heights were studied. Higher cross-sectional coverage resulted in higher pressure drops, flow deflection, and velocities downstream of the screens. Higher screen solidity ratios resulted in higher pressure drops, velocity reduction by screens, velocity acceleration above the screens, and turbulence generation. Plane turbulent mixing layers were produced by the shearing action of the screens' upper edge, resulting in increased turbulence generation and pressure loss.;FLUENT was used to numerically simulate the screens. Numerical models predicted the flow field downstream of the screens successfully.
机译：进行了数值模拟和实验研究，该数值模拟和实验研究了部分通过覆盖低湍流风洞横截面的扩展金属筛及其周围的湍流。金属粉筛网用于粉煤燃烧公用锅炉中，以通过降低过量的载粉烟气速度并重新分配粉煤灰颗粒浓度来抵消粉煤灰颗粒的侵蚀作用。三种筛网类型在三个筛网高度被研究了。较高的横截面覆盖率会导致较高的压降，流量偏斜和滤网下游的速度。较高的筛网固体比导致较高的压降，筛网的速度降低，筛网上方的速度加速度以及湍流的产生。滤网上边缘的剪切作用产生了平面湍流混合层，从而增加了湍流的产生和压力损失。; FLUENT用于对滤网进行数值模拟。数值模型成功地预测了滤网下游的流场。

著录项

  • 作者

    Ansari, Ali.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Engineering Mechanical.
  • 学位 M.A.Sc.
  • 年度 1998
  • 页码 110 p.
  • 总页数 110
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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