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Impact of rib shape on heat transfer using LES

机译：肋条形状对使用LES传热的影响

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摘要

Numerical studies of the flow field and heat transfer in a fully developed ribbed channel have been performed using Large Eddy Simulation (LES). Validation of the LES against measurements shows encouraging agreement. An immersed boundary method (IBM) has been implemented and validated for use with LES to solve the challenge of varying complex rigid geometries. Ten different rib shapes are investigated aiming to improve heat transfer performance, i.e., square, perforated, triangular with increasing height in the flow direction, triangular with decreasing height in the flow direction, pentagonal with increasing height in the flow direction, pentagonal with decreasing height in the flow direction, house-shaped, groove-shaped, semicircular and arc. The triangular rib with increasing height in the flow direction, with the largest recirculation bubble, was found to provide the best heat transfer performance (accounting for pressure loss), giving up to 7% greater heat transfer than the basic square profile. Ribs with larger recirculating zones tend to provide better heat transfer performance. Rounded-corners with the shortest re-circulation zones deteriorated heat transfer performance. Adding round edges to the trian-gular_up ribs to fit manufacturing conditions, led to heat transfer performance reduction of 12-16%.
机译：使用大涡流模拟（LES）进行了完全开发的罗纹通道中流场和传热的数值研究。对测量的验证显示令人鼓舞的协议。已经实施并验证了浸入的边界法（IBM），以便与LES一起使用，以解决不同复杂的刚性几何形状的挑战。研究了十种不同的肋形状，旨在改善传热性能，即方向，穿孔的三角形，随着流动方向上的增加，三角形在流动方向上的高度减小，流量方向上的高度增加，高度升高在流动方向，房屋形，凹槽形，半圆形和弧形。在流动方向上具有增加的高度的三角形肋，具有最大的再循环泡，提供最佳的传热性能（压力损失算法），热传递高于基本方形的热传递高达7％。具有较大再循环区域的肋倾向于提供更好的传热性能。圆角具有最短的重新循环区域劣化传热性能。将圆形边缘添加到Trian-Gular_up肋骨以适应制造条件，导致传热性能降低12-16％。

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  • 来源
    《Applied Mathematical Modelling》 |2021年第9期|244-267|共24页
  • 作者

    James C. Tyacke; Yushuang Dai; Paul G. Tucker;

  • 作者单位

    Department of Mechanical and Aerospace Engineering Brunei University London Uxbridge UB8 3PH UK;

    Department of Engineering University of Cambridge Cambridge CB2 1PZ UK;

    Department of Engineering University of Cambridge Cambridge CB2 1PZ UK;

  • 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

    LES; Turbine; Heat transfer; SGS;

    机译：les;涡轮;传播热量;SGS.;

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