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首页> 外文期刊>International Journal of Heat and Mass Transfer >Local heat and mass transfer measurements for multi-layered impingement/effusion cooling: Effects of pin spacing on the impingement and effusion plate
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Local heat and mass transfer measurements for multi-layered impingement/effusion cooling: Effects of pin spacing on the impingement and effusion plate

机译：多层撞击/渗出冷却的局部传热和传质测量：销钉间距对撞击和渗出板的影响

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摘要

Practical implementation of transpiration cooling system can be realized by multi-layered impingement/effusion cooling system which is composed of two or more layers with pins. Due to restrictions of very low height in multi-layered impingement/effusion cooling, heat transfer characteristics are affected by pin space to diameter. In this paper, the effects of pin space to diameter ratio, S_p/d, are investigated on all internal surfaces including impingement plate and pin surfaces. Local heat/mass transfer measured using a naphthalene sublimation method. The ratio of height to diameter ratio, h/d, is fixed at 0.25, and Reynolds number based on the hole diameter is 3000. As a results, heat transfer characteristics on effusion plate are similar to narrow impingement jet cooling without pins, in the case of S_p/ d = 6.0. Local Sherwood number distributions are affected by biased location of pins at S_p/d = 2 and 1.5. Pins block the flow channel, and make flow area narrower. The secondary peak moved outwards in the radial direction, 18%, and Sherwood number of the secondary peak was enhanced by 6%. Comparing the heat/mass transfer of all of the cases, and considering pumping power, increasing pins (decreasing S_p/d) resulted in superior performance. Comparison factor of S_p/d = 2.0 and S_p/d =1.5 was on the 2.2.
机译：蒸腾冷却系统的实际实现可以通过多层冲击/渗出冷却系统来实现，该系统由两层或更多层带销组成。由于在多层撞击/排出冷却中高度非常低的限制，所以传热特性会受到销间距与直径的影响。在本文中，研究了所有内表面（包括冲击板和销表面）上销间距与直径之比S_p / d的影响。使用萘升华方法测量的局部热/质量传递。高度与直径之比（h / d）固定为0.25，基于孔直径的雷诺数为3000。结果，积液板上的传热特性类似于无销的窄冲击射流冷却。 S_p / d = 6.0的情况。局部Sherwood数分布受S_p / d = 2和1.5的引脚偏置位置的影响。销钉会阻塞流动通道，并使流动区域变窄。第二个峰沿径向向外移动18％，第二个峰的Sherwood数增加了6％。比较所有情况下的热量/质量传递，并考虑泵浦功率，增加销钉（降低S_p / d）可获得更高的性能。 S_p / d = 2.0和S_p / d = 1.5的比较系数在2.2上。

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