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Comparison between impingement/effusion and double swirl/effusion cooling performance under different effusion hole diameters

机译:不同流布孔直径下冲击/积液与双旋流/积液冷却性能的比较

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摘要

This paper numerically investigates the effects of the film cooling hole diameter on the flow and heat transfer characteristics of the impingement/effusion cooling and double swirl/effusion cooling. Impingement jet arrays at three jet Reynolds numbers, 10,000, 15,000, 20,000, are employed. The target channel consists of a semicircular channel in impingement/effusion cooling and two partially overlapping cylinders in double swirl/effusion cooling. Three arrays of film cooling hole rows are established on the target surface under two arrangements. Four film cooling hole diameters, 0.4, 0.6, 0.8 and 1.0 times the jet hole diameter, are considered. The flow structure and flow development inside the target channel are compared and analysed. The heat transfer performance are discussed and compared. Results show that the effusion air distribution and Nusselt number distribution is more uniform in double swirl/effusion cooling. With the application of the double swirl channel, about 20-33% increase in overall averaged Nusselt number of the whole target channel and about 12-20% increase in spatially averaged Nusselt number at the effective cooling region are obtained. With the application of the film cooling holes, the maximum increase in spatially averaged Nusselt number at the effective cooling region is 10.3% in impingement/effusion cooling and 4.7% in double swirl/effusion cooling. (C) 2019 Elsevier Ltd. All rights reserved.
机译:本文在数值上研究了薄膜冷却孔直径对冲击/积液冷却和双旋流/积液冷却的流动和传热特性的影响。采用三次喷射雷诺数的冲击喷射阵列,10,000,15,000,20,000。目标通道包括在冲击/积液冷却的半圆通道和双旋流/积液冷却中的两个部分重叠的汽缸组成。在两个布置下,在目标表面上建立了三个薄膜冷却孔行。考虑四个薄膜冷却孔直径,0.4,0.6,0.8和1.0倍的喷射孔直径。比较和分析目标通道内的流动结构和流动开发。讨论和比较传热性能。结果表明,在双旋流/积液冷却中,积液空气分布和露珠数分布更均匀。随着双旋流通道的施加,得到了整个目标通道的整体平均良好的数量的约20-33%,获得了有效冷却区域的空间平均愈合号的约12-20%。随着薄膜冷却孔的施加,在有效冷却区域的空间平均泡沫数的最大增加在撞击/积液冷却的撞击/积液冷却中为10.3%,双旋流/积液冷却4.7%。 (c)2019 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2019年第10期|1097-1113|共17页
  • 作者单位

    Xi An Jiao Tong Univ Inst Turbomachinery Shaanxi Engn Lab Turbomachinery & Power Equipment Xian 710049 Shaanxi Peoples R China;

    Xi An Jiao Tong Univ Inst Turbomachinery Shaanxi Engn Lab Turbomachinery & Power Equipment Xian 710049 Shaanxi Peoples R China;

    Xi An Jiao Tong Univ Inst Turbomachinery Shaanxi Engn Lab Turbomachinery & Power Equipment Xian 710049 Shaanxi Peoples R China;

    Xi An Jiao Tong Univ Inst Turbomachinery Shaanxi Engn Lab Turbomachinery & Power Equipment Xian 710049 Shaanxi Peoples R 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

    Internal cooling; Jet impingement; Swirling flow; Double swirl cooling; Numerical simulation;

    机译:内部冷却;喷射冲击;旋转流动;双旋转冷却;数值模拟;

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