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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental investigation on analogy principle of conjugate heat transfer for effusion/impingement cooling
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Experimental investigation on analogy principle of conjugate heat transfer for effusion/impingement cooling

机译：渗流/冲击冷却复合传热模拟原理的实验研究

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摘要

The previous theoretical work has presented the importance of temperature ratios T_g/T_c in scaling overall cooling effectiveness and proposed several matching principles for scaling overall cooling effectiveness. These matching principles were experimentally validated on the flat plate with impingement/effusion cooling. Tested conditions included four temperature ratios (T_g/T_c= 1.1,1.2,1.3 and 1.98), three blowing ratios (M = 0.46, 0.9 and 1.8) and three momentum flux ratios (M=0.1, 0.4 and 1.6). All cases had matched mainstream side Biot number and Reynolds number. The 2D contours of overall cooling effectiveness were measured by using IR thermography. The results indicate that matching momentum flux ratio provides acceptable matching performance of overall cooling effectiveness for combining effusion and impingement cooling scheme, in spite of the different temperature ratios among these cases. Different from the results of matching momentum flux ratio cases, decrease in temperature ratio is found to significantly increase the overall cooling effectiveness for matching blowing ratio cases. Similar matching results are also observed in pure effusion cooling scheme. Nevertheless, at small momentum flux ratio, this matching method is not recommended for pure effusion cooling scheme due to the notable influence of film cooling effectiveness on scaling overall cooling effectiveness.
机译：先前的理论工作已经提出了温度比T_g / T_c在确定总体冷却效率时的重要性，并提出了一些用于确定总体冷却效率的匹配原理。这些匹配原理已通过冲击/喷射冷却在平板上进行了实验验证。测试条件包括四个温度比（T_g / T_c = 1.1、1.2、1.3和1.98），三个吹气比（M = 0.46、0.9和1.8）和三个动量比（M = 0.1、0.4和1.6）。所有病例均与主流侧毕奥数和雷诺数相匹配。通过使用红外热像仪测量了总体冷却效率的二维轮廓。结果表明，尽管在这些情况下温度比不同，但匹配的动量通量比为结合渗流和冲击冷却方案提供了总体冷却效率的可接受匹配性能。与匹配动量通量比情况的结果不同，发现降低温度比可以显着提高匹配吹气比情况的整体冷却效率。在纯积液冷却方案中也观察到类似的匹配结果。然而，在较小的动量通量比下，由于薄膜冷却效率对缩放总体冷却效率有显着影响，因此不建议将这种匹配方法用于纯喷射冷却方案。

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