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首页> 外文期刊>International Journal of Heat and Mass Transfer >Impingement/effusion cooling with a hollow cylinder structure for additive manufacturing: Effect of channel gap height
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Impingement/effusion cooling with a hollow cylinder structure for additive manufacturing: Effect of channel gap height

机译：采用空心圆柱结构进行冲击/积液冷却，用于添加制造：通道间隙高度的影响

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摘要

The present study is to investigate the effect of gap height on heat/mass transfer for impingement/effusion cooling of gas turbine hot components, using a hollow cylinder structure created by three perforated plates with two channels. The detailed local heat/mass transfer coefficients on all surfaces of the structure are measured in the test section using a naphthalene sublimation method. Flow characteristics in the structure are revealed using a numerical simulation such as jet impingement, wall jets, and toroidal vortices. The hole spacing (P/D) and thickness of plate (t/D) in the present study are 6 and 1, respectively. The various gap height ratios, which mean the ratios between the gap height of the first channel and that of the second channel, are 1:4 (0.2D-0.8D), 1:1 (0.5D-0.5D), and 4:1 (0.8D-0.2D). Depending on the gap height ratios, heat/mass transfer distributions are obtained differently on each surface of the structure. The area-averaged Sherwood number on each surface shows a large variation ranging from 27% reduction in UM of the Case 3 and 42% increase in UB of the Case 3 with different gap heights at the Reynolds number (Rep) of 7,000. Considering the benefits of heat/mass transfer augmentation and the drawbacks associated with an increase in pressure drop, the structural configuration of the first channel of low gap height and the second channel of high gap height has the highest thermal performance factor, with an improvement of 4.8% at Re_D = 7,000. The scale of gap height and wall thickness of the gas turbine hot components should be selected in terms of the total blade wall thickness, number of multilayers, and manufacturing tolerance in additive manufacturing. Therefore, as gap height for the channel in the laminated structure is limited, the case of the gap height ratios of 1:4, which is the low gap height for the first channel and the high gap height for the second channel, offers the best cooling performance for gas turbine components compared to its counterpart having a high gap height of the first channel and a low gap height of the second channel.
机译：本研究是研究间隙高度对燃气轮机热部件冲击/积液冷却的热/质量传递的影响，使用由三个穿孔板产生的具有两个通道的空心圆柱结构。使用萘升华方法在试验部分中测量结构的所有表面上的详细局部热/传质系数。使用诸如喷气冲击，壁喷射器和环形涡流的数值模拟来揭示结构中的流动特性。本研究中的孔间距（P / D）和板（T / D）的厚度分别为6和1。各种间隙高度比，其意味着第一通道的间隙高度与第二通道的比例为1：4（0.2d-0.8d），1：1（0.5d-0.5d）和4 ：1（0.8d-0.2d）。根据间隙高度比，在结构的每个表面上不同地获得热/传质分布。每个表面上的区域平均舍伍德数显示出大的变化范围为um um um的27％，壳体3的Ub的42％增加42％，在7,000的雷诺数（rep）的不同间隙高度。考虑到热/质量传递增强的益处和与压降增加相关的缺点，低间隙高度和高间隙高度的第二通道的第一通道的结构配置具有最高的热性能因子，具有改善4.8％在re_d = 7,000处。燃气轮机热部件的间隙高度和壁厚的比例应根据总叶片壁厚，多层数量和添加剂制造中的制造公差来选择。因此，作为层叠结构中的通道的间隙高度受到限制，间隙高度比为1：4的情况，这是第一通道的低间隙高度和第二通道的高间隙高度，提供了最佳的与具有第一通道的高间隙高度和第二通道的低间隙高度相比，燃气轮机组件的冷却性能与第二通道的低间隙高度相比。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第8期|121420.1-121420.16|共16页
  • 作者

    Minho Bang; Sangjae Kim; Hee Seung Park; Taehyun Kim; Dong-Ho Rhee; Hyung Hee Cho;

  • 作者单位

    Aerospace Technology Research Institute Agency for Defense Development Yuseong-gu Daejeon 34186 Republic of Korea;

    Hanwha Aerospace R&D center 6 Pangyo-ro 319 Beon-gil Bundang-gu Seongnam-si Gyeonggi-do Republic of Korea;

    Department of Mechanical Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu Seoul Republic of Korea;

    Department of Mechanical Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu Seoul Republic of Korea;

    Korean Aerospace Research Institute 169-84 Gwahak-ro Yuseong-gu Daejeon 34133 Republic of Korea;

    Department of Mechanical Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu Seoul 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; Impingement/effusion cooling; Laminated layers with hollow-cylinder; structure; Additive Manufacturing;

    机译：燃气轮机;冲击/积液冷却;带空心缸的层压层;结构体;添加剂制造;

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