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首页> 外文期刊>Journal of Heat Transfer >Effect Of Temperature Ratio On Jet Array Impingement Heat Transfer
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Effect Of Temperature Ratio On Jet Array Impingement Heat Transfer

机译：温度比对射流阵列撞击传热的影响

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摘要

This paper consider the effects of temperature ratio on the heat transfer from an array of jets impinging on a flat plate. At a constant Reynolds number of 18,000 and a constant Mach number of 0.2, different ratios of target plate temperature to jet temperature are employed. The spacing between holes in the streamwise direction X is 8D, and the spanwise spacing between holes in a given streamwise row Y is also 8D. The target plate is located 3D away from the impingement hole exits. Experimental results show that local, line-averaged, and spatially averaged Nusselt numbers decrease as the T_(wa)/T_j temperature ratio increases. This is believed to be due to the effects of temperature-dependent fluid properties, as they affect local and global turbulent transport in the flow field created by the array of impinging jets. The effect of temperature ratio on crossflow-to-jet mass velocity ratio and discharge coefficients is also examined.
机译：本文考虑了温度比对一系列撞击平板的射流传热的影响。在恒定的雷诺数为18,000且恒定的马赫数为0.2的情况下，采用了目标塔板温度与喷射温度的不同比率。沿流向X的孔之间的间距为8D，给定沿流Y的孔之间的跨距间距也为8D。目标板的位置距撞击孔出口3D。实验结果表明，随着T_（wa）/ T_j温度比的增加，局部，线平均和空间平均的Nusselt数减少。据信这是由于温度相关的流体特性的影响，因为它们会影响由冲击射流阵列产生的流场中的局部和整体湍流传输。还检查了温度比对横流与射流质量速度比和排放系数的影响。

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