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一、前言 窄缝通道实质上是一种高宽比较大的矩形通道,它在涡轮叶片尾部的冷却中,在化工和能源利用等方面有着广泛的应用。大量的研究结果表明,窄缝通道的换热系数和阻力系数要比光滑圆管的低百分之十到百分之二十左右。然而在窄缝中采用各种强化手段后,情形变得比较复杂。在窄缝中加扰流柱不仅可以增加换热还可加强通道的刚性,是一种有效的强化换热手段,文献[3]和[4]对此进行了研究。将通道的内表面粗糙化是另一种强化方
I. Introduction Narrow channel is essentially a rectangular channel with high aspect ratio. It is widely used in chemical and energy utilization in the cooling of the tail of turbine blades. Numerous studies have shown that the heat transfer coefficient and drag coefficient of narrow channel are about 10% to 20% lower than that of smooth tubes. However, the use of various means of reinforcement in narrow slots has made the situation more complicated. Scrambling the flow column in the narrow slot can not only increase the heat transfer but also enhance the rigidity of the channel, which is an effective means of enhancing heat transfer. This has been studied in [3] and [4]. Roughening the inner surface of the channel is another reinforcement