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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental investigations on overall cooling effect of ribbed channel with air bleeds
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Experimental investigations on overall cooling effect of ribbed channel with air bleeds

机译：带肋排风通道整体降温效果的实验研究

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An experimental investigation on overall heat transfer performance of a rectangular channel, in which one wall has periodically placed oblique ribs to enhance heat exchange and cylindrical film holes to bleed cooling air, has been carried out in a hot wind tunnel at different mainstream temperatures, hot mainstream Reynolds numbers, coolant Reynolds numbers and blowing ratios. To describe the cooling effect of combined external coolant film with the internal heat convection enhanced by the ribs, the overall cooling effectiveness at the surface exposed in the mainstream with high temperature was calculated by the surface temperatures measured with an infrared thermal imaging system. The total mass flow rate of cooling air through the coolant channel was regulated by a digital mass flow rate controller, and the blowing ratio passing through the total film holes was calculated based on the measurements of another digital-type mass flow meter. The detailed distributions of overall cooling effectiveness show distinctive peaks in heat transfer levels near the film holes, remarkable inner convective heat transfer effect over entire channel surface, and visible conductive heat transfer effect through the channel wall; but only when the coolant Reynolds number is large enough, the oblique rib effect can be detected from the overall cooling effectiveness; and the oblique bleeding hole effect shows the more obvious trend with increasing blowing ratios. Based on the experimental data, the overall cooling effectiveness is correlated as the functions of Re_m (Reynolds number of hot mainstream) and Re_c (Reynolds number of internal coolant flow at entrance) for the parametric conditions examined.
机译：在热风隧道中，在不同的主流温度下，对矩形通道的整体传热性能进行了实验研究，在该通道中，一个壁定期放置倾斜的肋以增强热交换，并在圆柱状的膜孔中排放冷却空气。主流雷诺数，冷却液雷诺数和鼓风比。为了描述结合的外部冷却剂薄膜的冷却效果以及通过肋加强的内部对流，通过红外热成像系统测量的表面温度计算出在高温下主流暴露的表面的总体冷却效率。通过数字质量流量控制器调节通过冷却剂通道的冷却空气的总质量流量，并基于另一种数字型质量流量计的测量值计算通过总膜孔的吹气比。总体冷却效率的详细分布显示出薄膜孔附近的传热水平有明显的峰值，整个通道表面的显着内部对流传热效果以及通过通道壁的可见传导性传热效果。但是只有当冷却液的雷诺数足够大时，才能从整体冷却效率中检测出斜肋效应；斜孔的效果随着鼓风比的增加呈现出更加明显的趋势。根据实验数据，在检查的参数条件下，总体冷却效率与Re_m（热主流的雷诺数）和Re_c（入口处的内部冷却剂流的雷诺数）的函数相关。

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