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首页> 外文期刊>International Journal of Heat and Mass Transfer >Delta-Winglet-Pair for Enhancing Cooling Performance of a Single Dimple Imprinted Internal Channel
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Delta-Winglet-Pair for Enhancing Cooling Performance of a Single Dimple Imprinted Internal Channel

机译：Delta-Winglet - 对提高单个凹坑的冷却性能印迹内部通道

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摘要

Improving the cooling performance of internal channels is important to extend the lifespan of hot components exposed to heat in many types of machinery. This study was performed to examine the effects of placing a delta-winglet-pair (DWP) upstream of a single dimple in an internal cooling channel. The local heat/mass transfer coefficients (H/MTCs) were measured in the vicinity of the dimple by the naphthalene sublimation method (NSM). The cooling performances under laminar, transitional, and turbulent flow conditions were compared at different values of the DWP incidence angle (β). The DWP enhanced local H/MTCs within the dimple cavity due to intensified secondary vortices. With increasing the DWP incidence angle, the distance between the symmetrical vortices increased resulting in a different level of H/MTC enhancement. The optimum DWP incidence angle ranged between 30°＜ β ＜45° depending on the flow condition. The resulting area-averaged H/MTCs clearly indicated enhancement from the DWP. Under the laminar flow conditions, the H/MTCs were enhanced by 87%-125% from installing the DWP. The absolute H/MTCs were highest under the transitional flow conditions. Based on the present investigation, the installation of the DWP in the dimpled channel is highly recommended for both laminar and transitional flow conditions.
机译：提高内部通道的冷却性能对于在许多类型的机器中延长暴露于热量的热部件的寿命是重要的。进行该研究以检查在内部冷却通道中放置单个凹坑的Δ-幼幼叶对（DWP）的效果。通过萘升华法（NSM）在凹坑附近测量局部热/传质系数（H / MTC）。在DWP入射角（β）的不同值下比较层状，过渡和湍流条件下的冷却性能。由于增强的次级涡流，DWP增强了凹坑内的本地H / MTC。随着DWP入射角的增加，对称涡旋之间的距离增加，导致不同水平的H / MTC增强。最佳DWP入射角在30°<β<45°之间，取决于流动条件。得到的面积平均值H / MTCs清楚地表明了DWP的增强。在层流条件下，通过安装DWP，H / MTC增强87％-125％。在过渡流动条件下绝对H / MTC最高。基于本研究，强烈建议在层流和过渡流动条件下建议使用DWP在凹陷通道中的安装。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第10期|121647.1-121647.12|共12页
  • 作者

    Seok Min Choi; Hyun Goo Kwon; Seungyeong Choi; Minho Bang; Hee Koo Moon; Hyung Hee Cho;

  • 作者单位

    Department of Plant Technology Energy Systems Research Division Korea Institute of Machinery & Materials Daejeon 34103 Republic of Korea;

    T2B Center Technovalue Co. Seoul 06665 Republic of Korea;

    Department of Mechanical Engineering Yonsei University Seoul 03722 Republic of Korea;

    Aerospace Technology Research Institute Agency for Defense Development (ADD) Daejeon 34103 Republic of Korea;

    Department of Power Engineering Yonsei University Seoul 03722 Republic of Korea;

    Department of Mechanical Engineering Yonsei University Seoul 03722 Republic of Korea;

  • 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

    gas turbine; heat transfer; dimple; delta winglet pair; cooling performance;

    机译：燃气轮机;传播热量;酒窝;Delta Winglet对;冷却性能;

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