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首页> 外文期刊>International Journal of Heat and Mass Transfer >Flow structure and heat transfer in a square passage with offset mid-truncated ribs
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Flow structure and heat transfer in a square passage with offset mid-truncated ribs

机译：带有偏置的中截肋的方形通道中的流动结构和传热

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摘要

The enhancement of heat transfer attributed from rib turbulators relative to the increased pressure drop in the channel is a crucial design parameter. Thus, the design of the truncated ribs (whose length is less than the passage width) provides options to address such cooling requirements when the pressure loss is a critical factor. Considering different types of truncated ribs, mid-truncated ribs (which are truncated in the central part of the rib) have been proved to show better thermal performance than other types of truncated ribs. A numerical study of mid-truncated ribs with different offset placements or angles on turbulent heat transfer inside a non-rotating cooling passage of a gas turbine blade is performed for inlet Reynolds number ranging from 10,000 to 50,000. The overall performance characteristics of six different types of mid-truncated ribbed arrangements are also compared: Cases A1, A2, A3 utilize mid-truncated spanwise ribs with different relative rib stagger positions at different spanwise locations; Cases B, C, D utilize mid-truncated angled ribs with the ribs oriented at ±45° (Case B), +45°/+45° (Case C), and ±135° (Case D). In all cases, a gap is present between the ribs placed on opposite spanwise parts of the channel, to provide the mid-truncation. It is found that the 135° mid-truncated rib (Case D) has the highest heat transfer coefficient, while the 90° mid-truncated ribs with no offset placement (Case A1) behave best in reducing pressure loss penalty. Although Case A shows larger heat transfer augmentation, Case D is advantageous for augmenting side-wall heat transfer when the pressure loss is considered and the Reynolds number is comparatively large. Case C exhibits the best overall thermal performance over the largest range of experimental conditions when the pressure drop is also considered. Staggered arrangement for 90° mid-truncated ribs can enhance heat transfer efficiently and makes a good overall performance at low Reynolds numbers. Case A1 can be used in practical operation because of reduced weight and good thermal performance at high Reynolds numbers. This is the first study on various offset mid-truncated ribs aiming to improve the heat transfer of turbine blade internal cooling passages with reduced pressure loss penalty.
机译：相对于通道中增加的压降，肋湍流产生的传热增强是关键的设计参数。因此，当压力损失是关键因素时，截肋的设计（其长度小于通道宽度）提供了解决此类冷却要求的选项。考虑到不同类型的截肋，中间截肋（在肋的中央部分截断）已被证明比其他类型的截肋具有更好的热性能。对进口雷诺数范围为10,000到50,000的中间截断肋进行了数值研究，该肋在燃气轮机叶片的非旋转冷却通道内的湍流传热中具有不同的偏移位置或角度。还比较了六种不同类型的中截肋结构的总体性能特征：案例A1，A2，A3使用中截断的翼展肋，在不同的翼展位置具有不同的相对肋交错位置；案例B，C，D使用中截角的肋，肋的方向为±45°（案例B），+ 45°/ + 45°（案例C）和±135°（案例D）。在所有情况下，位于通道相对的翼展方向部分上的肋之间都存在间隙，以提供中间截断。发现135°中截肋（情况D）具有最高的传热系数，而90°中截肋无偏移位置（情况A1）在减少压力损失损失方面表现最佳。尽管情况A显示出更大的热传递增加，但是当考虑压力损失并且雷诺数较大时，情况D对于增加侧壁热传递是有利的。在考虑压力降的情况下，情况C在最大的实验条件范围内表现出最佳的整体热性能。 90°中截肋的交错排列可以有效地增强传热，并在低雷诺数下具有良好的整体性能。案例A1由于重量轻且在高雷诺数下具有良好的热性能，因此可用于实际操作。这是对各种偏置的中截肋的首次研究，旨在改善涡轮叶片内部冷却通道的热传递，并减少压力损失。

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  • 来源
  • 作者

    Gongnan Xie; Jian Liu; Phillip M. Ligrani; Bengt Sunden;

  • 作者单位

    Engineering Simulation and Aerospace Computing (ESAC), Key Laboratory of Contemporary Design and integrate Manufacturing Technology, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, China;

    Engineering Simulation and Aerospace Computing (ESAC), Key Laboratory of Contemporary Design and integrate Manufacturing Technology, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, China;

    Parks College of Engineering, Aviation and Technology, Saint Louis University, McDonnell Douglas Hall Room 1033A, USA;

    Division of Heat Transfer, Department of Energy Sciences, Lund University, P.O. Box 118, SE-22100 Lund, Sweden;

  • 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

    Heat transfer; Mid-truncated rib; Offset placement and angle; Recirculating flow; Reattachment; Numerical prediction;

    机译：传播热量;中截肋;偏移位置和角度;循环流;重新连接;数值预测;

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