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首页> 外文期刊>International Journal of Heat and Mass Transfer >A novel control of jet impingement heat transfer in cross-flow by a vortex generator pair
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A novel control of jet impingement heat transfer in cross-flow by a vortex generator pair

机译：涡流发生器对错流射流冲击传热的新型控制

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摘要

Jet impingement is an effective heat transfer method while the favorable performance is usually degraded by the cross-flow. In this article, a novel control of the impinging jet in cross-flow has been proposed. A delta winglet vortex generator pair (VGP) is installed in the cross-flow channel upstream of the jet nozzle. The jet and the cross-flow Reynolds numbers are 15,000 and 40,000, respectively. The ratio of nozzle-to-surface distance to jet diameter is 4.0. Experimental measurements are conducted to study the characteristics of heat transfer with liquid crystal thermography (LCT). Results indicate that the VGP with common-flow-up (CFU) configuration promotes the jet penetration in cross-flow and augments the impingement heat transfer greatly on the target wall compared to the baseline case without the VGP. In addition, the enhancement increases monotonically with the angle of attack of the VGP varying from a = 15° to 45°. The spacing between the VGP l_1 = 1.2d is preferred with the highest heat transfer augmentation of jet impingement among l_1 = 0.5-2.0d. The optimal value of spacing between the VGP and the jet nozzle l2 is suggested to be 4d in terms of enhancing the heat transfer, for the measurement range from l_2 = 2d to l_2 = 8d. The VGP with common-flow-down (CFD) configuration is also tested, but it leads to slightly lower heat transfer than without the VGP. Pressure drop of the jet in cross-flow with VGP is measured and analyzed.
机译：射流撞击是一种有效的传热方法，而良好的性能通常会因错流而降低。在本文中，提出了一种新型的横流撞击射流控制方法。三角翼小涡流发生器对（VGP）安装在喷嘴上游的错流通道中。射流和横流雷诺数分别为15,000和40,000。喷嘴表面距离与喷嘴直径之比为4.0。进行实验测量以研究液晶热成像（LCT）的传热特性。结果表明，与没有VGP的基线情况相比，具有通用流（CFU）构造的VGP促进了射流在横流中的渗透并大大增加了目标壁上的冲击传热。此外，随着VGP的迎角从a = 15°到45°变化，增强会单调增加。 VGP l_1 = 1.2d之间的间距是首选的，而射流冲击的传热增量最大的是l_1 = 0.5-2.0d。就增强传热而言，VGP和喷嘴l2之间的最佳间距建议为4d，测量范围为l_2 = 2d到l_2 = 8d。还测试了具有通用流（CFD）配置的VGP，但与没有VGP的VGP相比，其传热略低。测量并分析了与VGP交叉流动的射流压降。

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