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首页> 外文期刊>International Journal of Heat and Mass Transfer >Length to diameter ratio effect on heat transfer performance of simple and compound angle holes in thin-wall airfoil cooling
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Length to diameter ratio effect on heat transfer performance of simple and compound angle holes in thin-wall airfoil cooling

机译：长径比对薄壁翼型冷却中简单角孔和复合角孔传热性能的影响

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摘要

Heat transfer coefficients on a flat plate surface downstream a row of simple and compound angle cylindrical holes are investigated using high-resolution thermographic liquid crystal technique. A variation of flow parameters including blowing ratio, and geometry parameters including compound angle and length-to-diameter ratio are examined. Blowing ratios (M) ranging from 0.3 to 2, length to diameter ratios (L/D) from 0.5 to 5, and two compound angle (beta: 0 degrees, 45 degrees) are employed composing a test matrix of 70 test cases. Detailed local, spanwise averaged, and area averaged heat transfer coefficients h(f)/h(0) are presented to illustrate the effect of length-to-diameter ratio and compound angle. The film cooling performance is also evaluated using NHFR method and Delta(phi) method by combining adiabatic film effectiveness and heat transfer coefficient data. Results indicate that Delta(phi) method has superiority in evaluating film cooling performance due to its direct reflection of temperature reduction by film protection. (C) 2018 Elsevier Ltd. All rights reserved.
机译：使用高分辨率热成像液晶技术研究了一排简单且复角圆柱孔下游的平板表面上的传热系数。检查了包括吹塑比的流量参数的变化，以及包括复合角和长径比的几何参数的变化。吹塑比（M）为0.3至2，长度与直径之比（L / D）为0.5至5，采用两个复合角（β：0度，45度）构成了70个测试案例的测试矩阵。详细的局部，翼展方向平均和面积平均传热系数h（f）/ h（0）用于说明长径比和复合角的影响。通过结合绝热膜的有效性和传热系数数据，还可以使用NHFR方法和Deltaφ方法评估膜的冷却性能。结果表明，由于通过膜保护直接反映了温度的降低，Delta（φ）方法在评估膜冷却性能方面具有优势。 （C）2018 Elsevier Ltd.保留所有权利。

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