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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of the multiple rows of pin-fins on the cooling performance of cutback trailing-edge
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Effect of the multiple rows of pin-fins on the cooling performance of cutback trailing-edge

机译：多排墩翅片对倒塌后边缘冷却性能的影响

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摘要

Based on heat transfer analyses of trailing-edge cutback configuration, a novel turbulated cutback structure comprising a combination of pin-fins and cutback surface is proposed in this paper to enhance the film cooling effects of trailing-edge cutback cooling. Experimental investigations on the effects of the pin-fin cross-sectional geometry (round, elliptical, and teardrop-shaped) on the trailing-edge cooling performance at varying blowing ratios (M) ranging from 0.25 to 2.00 are conducted. Detailed data of the adi-abatic film effectiveness η is obtained using pressure-sensitive paint experiments, and the heat transfer coefficient is acquired by transient thermochromic liquid-crystal measurements. Then, the overall cooling performance of the turbulated cutback structure is evaluated and compared using the net heat flux reduction (NHFR). The experimental results show that the addition of pin-fins has an adverse effect on the film coverage on the expanded cutback surface, but only in the case at low M. The η distributions in the far-downstream region have a slight effect for the cases with different pin-fins. At M = 0.50, the area-averaged η values in the cases with elliptical and teardrop-shaped pin-fins are closer to those in the baseline case. As M increased, there is a monotonic increase in the heat transfer coefficient in each of the three cases with pin-fins. The case with pin-fins exhibits a high heat transfer rate that is significantly higher than that of the smooth baseline case, especially 13.3-26.0% higher than the smooth case in the M range of 1.00 to 1.50. The pin-fin shape exerted no significant impact on the surface heat transfer level at low M values. The case with round pin-fins gradually shows advantages at large M, and there is no significant difference in the area-averaged heat transfer between the cases with elliptical and teardrop-shaped pin-fins. Compared with the primeval cutback trailing-edge, the NHFR of the cases with pin-fins can significantly improve as M increased. At low M values, no significant difference in NHFR was found between the three cases with pin-fins, that is; the effectiveness of changing the shape in enhancing the overall cooling performance of a trailing-edge cutback cooling structure with pin-fins is limited. The elliptical pin-fins, which are advantageous on the high η values, can be selected at low M values. While the case with the round pin-fins is applied at large M values due to high heat transfer enhancement.
机译：基于后缘封端构造的传热分析，在本文中提出了一种新的湍流倒钩结构，包括销翅片和封堵表面的组合，以增强后缘倒塌冷却的薄膜冷却效应。对销翅片横截面几何形状（圆形，椭圆形和泪珠状）对0.25至2.00的不同吹气比（M）以0.25至2.00的后缘散热性能的效果的实验研究。使用压敏涂料实验获得ADI-肛交膜效果η的详细数据，通过瞬态热致变色液晶测量来获取传热系数。然后，使用净热通量减少（NHFR）来评估和比较湍流封堵结构的总冷却性能。实验结果表明，加入销翅片对膨胀倒塌表面上的薄膜覆盖产生不利影响，但仅在低M的情况下。远下游区域中的η分布对壳体具有轻微的效果用不同的尖鳍。在M = 0.50，具有椭圆形和泪珠状销翅片的情况下的面积平均值η值更接近基线壳体中的情况。随着M增加，在具有尖鳍中的三个案例中的每一个中的传热系数中存在单调增加。尖面翅片的情况表现出高传热速率，显着高于光滑基线情况，特别是在1.00至1.50的M范围内高于光滑壳体的13.3-26.0％。钉翅形状对低M值的表面传热水平没有显着影响。圆形销翅片的情况逐渐显示在大m的优点，并且在具有椭圆形和泪珠状的销翅片之间的情况下的面积平均传热没有显着差异。与Primeval Cudbach后缘相比，由于M增加，具有销翅片的壳体的NHFR可以显着提高。在低m值下，在销鳍片的三个案例中发现了NHFR的显着差异，即;改变形状改变提高带销翅片的后缘封端冷却结构的整体冷却性能的有效性受到限制。在低M值下可以选择对高η值有利的椭圆形销鳍片。由于高热传递增强，在大的M值下施加圆形销鳍的情况。

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