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首页> 外文期刊>International Journal of Heat and Mass Transfer >Convective heat transfer of a row of air jets impingement excited by triangular tabs in a confined crossflow channel
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Convective heat transfer of a row of air jets impingement excited by triangular tabs in a confined crossflow channel

机译：受限横流通道中由三角形凸片激发的一排空气射流撞击的对流传热

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摘要

Computational and experimental studies were conducted to investigate the conjugated convective heat transfer produced by single row of impinging jets inside a confined channel with non-uniform initial crossflow issued from discrete holes. The effects of the crossflow-to-jet Reynolds number ratio and cross-flow holes arrangement (inline or staggered in relative to the impinging jet holes) on the jet impingement behaviors were studied providing the same total cooling air mass flowrate. Particular attention was paid to examine the tab-excited jet impingement behaviors in a confined channel with non-uniform crossflow. The results show that the tabbed excitation on the improvement of convective heat transfer in the vicinity of impingement region is not as well as the situation where no initial crossflow is present. For the inline arrangement of crossflow holes, the location corresponding to the peak laterally-averaged Nusselt number is moved downstream and the peak laterally-averaged Nusselt number is decreased significantly under larger crossflow-to-jet Reynolds number ratios. While for the staggered arrangement of crossflow holes, the location corresponding to the peak laterally-averaged Nusselt number is not affected by the crossflow but the peak laterally-averaged Nusselt number is decreased monotonously with the increase of crossflow-to-jet Reynolds number ratio. Under small crossflow-to-jet Reynolds number ratio, the initial crossflow arrangement has little influence on the laterally-averaged Nusselt number distribution. Among three crossflow-to-jet Reynolds number ratios ranged from 0.5 to 2, the maximum relative difference of peak laterally-averaged Nusselt numbers between two different crossflow arrangements is occurred under crossflow-to-jet Reynolds number ratio of 1.
机译：进行了计算和实验研究，以研究由狭窄孔道内单排撞击射流产生的共轭对流传热，其中离散孔产生的初始横流不均匀。研究了在提供相同的总冷却空气质量流量的情况下，横流与雷诺数比和横流孔布置（相对于正射流孔成一直线或交错排列）对射流撞击行为的影响。特别注意检查在非均匀错流的密闭通道中的翼片激发射流撞击行为。结果表明，在撞击区域附近，改进对流传热的标签激励不如没有初始错流的情况。对于错流孔的直列排列，在较大的错流与射流雷诺数比下，与横向平均Nusselt峰值相对应的位置会向下游移动，并且横向平均Nusselt峰值将大大降低。对于错流孔的交错排列，与横向平均Nusselt峰值相对应的位置不受错流影响，但横向平均Nusselt峰值随错流与雷诺数比的增加而单调降低。在较小的横流与雷诺数比下，初始横流排列对横向平均Nusselt数分布几乎没有影响。在从0.5到2的三个横流与雷诺数比之间，两个不同横流排列之间的横向平均Nusselt峰值的最大相对差出现在横流与雷诺数比为1的情况下。

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    Ye-zhen Yu; Jing-zhou Zhang; Yong Shan;

  • 作者单位

    College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China,School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China;

    Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China,Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China;

    College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, 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

    Jet impingement; Initial crossflow; Non-uniform crossflow; Conjugated convective heat transfer; Tabbed excitation;

    机译：射流冲击;初始横流;错流不均匀;共轭对流换热;标签激励;

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