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首页> 外文期刊>Journal of Heat Transfer >Effect of Chemical Reactions of H_2/O_2 Combustion Gas on Wall Heat Flux in a Turbulent Channel Flow
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Effect of Chemical Reactions of H_2/O_2 Combustion Gas on Wall Heat Flux in a Turbulent Channel Flow

机译：H_2 / O_2燃烧气体化学反应对湍流通道壁热通量的影响

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摘要

The effect of chemical reactions of burnt gas on heat transfer on a cooled wall in a turbulent channel flow is investigated by direct numerical simulations. Burnt gas from a H_2/O_2 mixture is used as a fluid and a detailed chemical reaction mechanism that considers eight chemical species and 19 elemental reactions is used in the reaction calculation. The initial gas temperature and pressure are 3173K and 2.0 MPa, respectively. The Reynolds number based on the channel width and mean streamwise velocity is approximately 6400 and that based on the channel half width and friction velocity is approximately 200. The results show that heat release because of consumption of radicals such as OH and H near the wall increases the heat flux on the wall and that the heat flux is enhanced by the significant increase in the local heat flux at high-speed streaks where radicals are supplied by sweep events constituting bursting motions in the turbulent boundary layer.
机译：通过直接数值模拟研究了燃烧气体的化学反应对湍流通道流中冷却壁传热的影响。将H_2 / O_2混合物产生的燃烧气体用作流体，并在反应计算中使用考虑了8种化学物种和19种元素反应的详细化学反应机理。初始气体温度和压力分别为3173K和2.0 MPa。基于通道宽度和平均流向速度的雷诺数约为6400，基于通道半宽度和摩擦速度的雷诺数约为200。结果表明，由于壁附近的OH和H等自由基的消耗，放热增加了壁上的热通量，以及在高速条纹处局部热通量的显着增加而增强了热通量，在高速条纹中，通过在湍流边界层中构成爆发运动的扫掠事件提供了自由基。

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  • 来源
    《Journal of Heat Transfer》 |2017年第4期|044501.1-044501.5|共5页
  • 作者

    Tomoaki Kitano; Hiroaki Iida; Ryoichi Kurose;

  • 作者单位

    Department of Mechanical Engineering and Science, Advanced Research Institute of Fluid Science and Engineering, Kyoto University, Kyoto Daigaku-Katsura Katsura Campus, C-Cluster, Nishikyo-ku, Kyoto 615-8540, Japan;

    Department of Mechanical Engineering and Science, Advanced Research Institute of Fluid Science and Engineering, Kyoto University, Kyoto Daigaku-Katsura Katsura Campus, C-Cluster, Nishikyo-ku, Kyoto 615-8540, Japan;

    Department of Mechanical Engineering and Science, Advanced Research Institute of Fluid Science and Engineering, Kyoto University, Kyoto Daigaku-Katsura Katsura Campus, C-Cluster, Nishikyo-ku, Kyoto 615-8540, Japan;

  • 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
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