On the existence of a threshold value of the plate bluntness in the interference of an oblique shock with boundary and entropy layers
On the existence of a threshold value of the plate bluntness in the interference of an oblique shock with boundary and entropy layers
复制标题
斜激波与边界层和熵层干涉时板钝度阈值的存在性
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
I. V. Struminskaya
中科院分区：
文献类型：
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作者：
V. Borovoy;A. Skuratov;I. V. Struminskaya
已经通过实验研究了斜激波入射区域中尖锐和稍微钝的平板的传热。实验在马赫数 M = 6、8 和 10 以及雷诺数范围从 0.2 × 106 到 1.3 × 106 下进行，对应于激波引起的分离区中的过渡（层流-湍流）流。重点放在钝度半径 r 的小值上。发现存在一个半径阈值rth，限制了其对传热的影响范围，即r增加到rth会导致干扰区最大传热系数急剧减小，而进一步增加（超过rth）对最大传热系数影响很小。分析了rth对高超声速流主要参数的依赖性。给出了可观察到的现象的解释。
The heat transfer to sharp and slightly blunted flat plates in the zone of oblique shock incidence has been experimentally investigated. The experiments were performed at the Mach numbers M = 6, 8, and 10 and Reynolds numbers ranging from 0.2 × 106 to 1.3 × 106 corresponding to transitional (laminar-turbulent) flow in the shock-induced separation zone. Emphasis is placed on small values of the bluntness radius r. It is established that there exists a threshold value rth of the radius that bounds the range of its influence on the heat transfer, namely, an increase in r to rth leads to a sharp reduction in the maximum heat transfer coefficient in the interference zone, whereas a further increase (beyond rth) has only a slight effect on the maximum heat transfer coefficient. The dependence of rth on the main hypersonic flow parameters is analyzed. an explanation of the observable phenomena is given.