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首页> 外文会议>ASME turbo expo: turbine technical conference and exposition >EFFECT OF REYNOLDS NUMBER, HOLE PATTERNS AND HOLE INCLINATION ON COOLING PERFORMANCE OF AN IMPINGING JET ARRAY, PART Ⅰ: CONVECTIVE HEAT TRANSFER RESULTS AND OPTIMIZATION
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EFFECT OF REYNOLDS NUMBER, HOLE PATTERNS AND HOLE INCLINATION ON COOLING PERFORMANCE OF AN IMPINGING JET ARRAY, PART Ⅰ: CONVECTIVE HEAT TRANSFER RESULTS AND OPTIMIZATION

机译：雷诺数，孔型和孔倾角对射流射流阵列冷却性能的影响，第一部分：对流换热结果和优化

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摘要

This study comprehensively illustrates the effect of Reynolds number, hole spacing, jet-to-target distance and hole inclination on the convective heat transfer performance of an impinging jet array. Highly resolved heat transfer coefficient distributions on the target plate are obtained utilizing transient liquid crystal over a range of Reynolds numbers varying between 5,000 and 25,000. Effect of streamwise and spanwise jet-to-jet spacing (X/D, Y/D: 4-8) and jet-to-target plate distance (Z/D: 0.75-3) are employed composing a test matrix of 36 different geometries. Additionally, the effect of hole inclination (0: 0°-40°) on the heat transfer coefficient is investigated. Optical hole spacing arrangements and impingement distance are pointed out to maximize the area-averaged Nusselt number and minimize the amount of cooling air. Also included is a new correlation, based on that of Florschuetz et al., to predict row-averaged Nusselt number. The new correlation is capable to cover low Z/D-0.75 and presents better prediction of row-averaged Nusselt number, which proves to be an effective impingement design tool.
机译：这项研究全面地说明了雷诺数，孔距，射流到目标的距离和孔倾角对撞击射流阵列对流传热性能的影响。利用瞬态液晶在5,000到25,000之间变化的雷诺数范围内，可以在目标板上获得高度解析的传热系数分布。采用沿流向和跨向的射流间距离（X / D，Y / D：4-8）和射流至目标板间距离（Z / D：0.75-3）的影响，组成了36种不同的测试矩阵几何形状。另外，研究了孔倾斜度（0：0°-40°）对传热系数的影响。指出了光学孔的间距安排和撞击距离，以使面积平均努塞尔数最大，并使冷却空气量最小。还包括一个基于Florschuetz等人的新关联，以预测行平均Nusselt数。新的相关性能够覆盖低Z / D-0.75，并能更好地预测行平均Nusselt数，这被证明是一种有效的碰撞设计工具。

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