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首页> 外文期刊>International Journal of Heat and Mass Transfer >Conjugate heat transfer on leading edge of a conical wall subjected to external cold flow and internal hot jet impingement from chevron nozzle - Part 1: Experimental analysis
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Conjugate heat transfer on leading edge of a conical wall subjected to external cold flow and internal hot jet impingement from chevron nozzle - Part 1: Experimental analysis

机译：从人字形喷嘴受到外部冷流和内部热射流撞击的锥形壁前缘上的共轭传热-第1部分：实验分析

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摘要

Experimental investigations were carried out to study the conjugated convective heat transfer on the leading edge of a conical wall subjected to external cold flow and internal hot jet impingement by a single chevron nozzle. The geometric effects, including the chevron penetration depth (p/d ranging from 0.1 to 0.2) and chevron length (l/d ranging from 0.1 to 0.3) on the conjugated convective heat transfer performances were experimentally analyzed for a typical 6-chevrons nozzle under non-dimensional jet-to-leading edge distance (H/d) of 2-4 and jet Reynolds number (Re_j) of 7800-39,400. The results show that the chevron jet is proved to be capable of improving the heating effectiveness in the vicinity of the conical surface leading edge, especially under a small jet Reynolds number. For the specified zone with a chordwise length of 5d apart from the leading edge, the area-averaged heat effectiveness could be increased approximately 20% by the chevron nozzle in relative to the conventional nozzle. The heat transfer enhancement is improved with the increase of chevron penetration length for a fixed chevron length or the decrease of chevron length for a fixed chevron penetration length. The influence of chevron penetration depth or the chevron length on the specified area-averaged heating effectiveness becomes weaker gradually as the jet Reynolds number increases. For the current conditions, the non-dimensional jet-to-leading edge distance seems to have little influence on the specified area-averaged heating effectiveness.
机译：进行了实验研究，以研究圆锥形壁的前缘上的共轭对流传热，该圆锥形壁受到单个人字形喷嘴的外部冷流和内部热射流的撞击。对于典型的6字形V型喷嘴，在实验条件下分析了V字形穿透深度（p / d范围为0.1至0.2）和V形长度（l / d范围为0.1至0.3）对共轭对流换热性能的几何影响。无量纲的射流到前沿的距离（H / d）为2-4，射流雷诺数（Re_j）为7800-39,400。结果表明，人字形射流被证明能够提高锥形表面前缘附近的加热效率，尤其是在雷诺数较小的情况下。对于弦区域距前端5d的指定区域，人字形喷嘴相对于传统喷嘴可以将面积平均热效率提高约20％。对于固定人字形长度，人字形穿透长度的增加或对于固定人字形穿透长度，人字形长度的减小会改善传热效果。随着射流雷诺数的增加，人字形穿透深度或人字形长度对指定区域平均加热效率的影响逐渐减弱。对于当前条件，无量纲的射流到前沿的距离似乎对指定面积平均加热效率几乎没有影响。

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  • 作者

    Tao Guan; Jing-zhou Zhang; Yong Shan; Jin Hang;

  • 作者单位

    College of Energy and Power Engineering, Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;

    College of Energy and Power Engineering, 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, Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;

    College of Energy and Power Engineering, Jiangsu Province Key Laboratory of Aerospace Power System, 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

    Conjugated convective heat transfer; Hot jet impingement; Conical surface; Chevron nozzle;

    机译：共轭对流换热;热流冲击;锥形表面人字形喷嘴;

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