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首页> 外文期刊>Journal of Heat Transfer >Validation and Analysis of Numerical Results for a Varying Aspect Ratio Two-Pass Internal Cooling Channel
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Validation and Analysis of Numerical Results for a Varying Aspect Ratio Two-Pass Internal Cooling Channel

机译：纵横比不同的两通道内部冷却通道数值结果的验证和分析

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摘要

Numerical results for an internal ribbed cooling channel including a 180 deg bend with a 2:1 inlet and a 1:1 aspect ratio outlet channel were validated against experimental results in terms of spatially resolved heat transfer distributions, pressure losses, and velocity distributions. The numerical domain consisted of one rib segment in the inlet channel and three ribs segments in the outlet channel to reduce the overall numerical effort and allow for an extensive parametric study. The results showed good agreement for both heat transfer magnitudes and spatial distributions, and the numerical results captured the predominate flow physics resulting from the 180 deg bend. The production of Dean vortices and acceleration of the flow in the bend produced strongly increased heat transfer on both the ribbed and unribbed walls in the outlet channel in addition to increases due to the ribs. Numerical simulations were performed for a wide range of divider wall-to-tip wall distances, which influenced the position of the highest heat transfer levels on the outlet walls and changed the shape of the heat transfer distribution on the tip wall. Analysis of section averages of heat transfer in the bend and outlet channel showed a strong influence of the tip wall distance, while no effect was seen upstream of the bend. A similarly large effect on pressure losses in the bend was observed with varying tip wall position. Trends in averaged heat transfer varied linearly with tip wall distance, while pressure losses followed a nonlinear trend, resulting in an optimum tip wall distance with respect to heat transfer efficiency.
机译：在空间分辨的传热分布，压力损失和速度分布方面，相对于实验结果，验证了内部带肋冷却通道的数值结果，该通道具有180度弯角，其中入口通道为2：1，长径比为1：1。数值域由入口通道中的一个肋段和出口通道中的三个肋段组成，以减少总体数值计算量并允许进行广泛的参数研究。结果表明，传热幅度和空间分布都具有很好的一致性，并且数值结果反映了180度弯曲产生的主要流动物理性质。院长涡流的产生和弯道中流动的加速，除了由于肋的增加外，在出口通道的肋壁和无肋壁上的传热也大大增强。对分隔壁到尖端壁的距离进行了广泛的数值模拟，这影响了出口壁上最高传热水平的位置，并改变了尖端壁上传热分布的形状。分析弯头和出口通道中的传热截面平均值显示，对顶壁距离的影响很大，而在弯头上游看不到任何影响。在改变尖端壁位置的情况下，观察到了对弯头压力损失的类似大影响。平均传热趋势随刀尖壁距离线性变化，而压力损失遵循非线性趋势，从而导致相对于传热效率的最佳刀尖壁距离。

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