Effects of Internal Coolant Crossflow on Film-Cooling Performance of Double-Jet and Cylindrical Holes

Volume 6A: Heat Transfer — Combustors; Film Cooling Pub Date : 2022-06-13 DOI:10.1115/gt2022-82514

Huaitao Zhu, G. Xie, R. Zhu, B. Sundén

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Abstract

In this paper, the effects of internal coolant crossflow on double-jet holes were simulated and compared with two rows of cylindrical holes under three blowing ratios (M = 0.5, 1.0, and 1.5), with an established and validated turbulence model. The results show that double-jet holes can provide better film cooling performance for the three different blowing ratios compared with cylindrical holes. As the blowing ratio increases, the superiority of double-jet holes becomes more obvious. The introduction of crossflow can significantly enlarge the coolant coverage area of cylindrical holes, and increase the laterally-averaged film cooling effectiveness. For double-jet holes, the internal coolant crossflow also increases the laterally averaged film cooling effectiveness, but the improvement is limited. For the −45° compound angle film hole of double-jet holes, the internal coolant crossflow decreases the normal velocity (momentum), and makes the coolant to attach on the plate. However, for the other hole, the influence is opposite, the normal velocity (momentum) is increased and the coolant is detached from the plate.

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内冷却剂横流对双射流和圆柱孔气膜冷却性能的影响

本文利用已建立并验证的湍流模型，模拟并比较了三种吹气比(M = 0.5、1.0和1.5)下两排圆柱孔内冷却剂横流对双射流孔的影响。结果表明，在三种不同吹气比下，双射流孔比圆柱孔具有更好的气膜冷却性能。随着吹气比的增大，双喷孔的优越性更加明显。横流的引入可以显著扩大圆柱孔的冷却剂覆盖面积，提高横向平均气膜冷却效率。对于双射流孔，内部冷却剂的横流也提高了横向平均气膜冷却效率，但提高幅度有限。对于双射流孔的- 45°复合角膜孔，内部冷却剂的横流降低了法向速度(动量)，使冷却剂附着在板上。然而，对于另一个孔，影响是相反的，法向速度(动量)增加，冷却剂与板分离。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Volume 6A: Heat Transfer — Combustors; Film Cooling

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