Large-scale structure visualization and convection velocity in supersonic blunt-base cylinder wakes
Large-scale structure visualization and convection velocity in supersonic blunt-base cylinder wakes
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DOI：
10.1063/1.2432157
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发表时间：
2007-01
影响因子：
4.6
通讯作者：
A. Kastengren;J. Dutton;G. Elliott
中科院分区：
文献类型：
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作者：
A. Kastengren;J. Dutton;G. Elliott
本文用时间相关成象方法研究了M=2.46气流在0°和10°攻角下的超声速钝底圆柱尾迹。大规模结构的时间演化大多由膨胀、收缩或翻转组成，结构之间的相互作用似乎起着很小的作用。虽然结构偶尔合并，但在可视化中没有观察到旋转配对事件。攻角尾流迎风部分中再压缩激波的位置似乎在快速时间尺度上波动，激波位置中的扰动倾向于跟随相邻剪切层中大尺度结构的对流。在本研究中，剪切层的高速侧和低速侧之间的结构对流速度似乎存在一致的差异。轴对称尾迹和攻角尾迹在再附前均遵循流选择规律，但再压缩和再附过程对结构控制有较大影响。
Time-correlated imaging has been used to study supersonic blunt-base cylinder wakes at 0° and 10° angle-of-attack to an M=2.46 flow. Most of the temporal evolution of the large-scale structures consists of swelling, shrinking, or rollover, with interactions between structures seeming to play a small role. While structures occasionally merge, rotational pairing events are not observed in the visualizations. The position of the recompression shock in the windward part of the angle-of-attack wake appears to fluctuate on rapid time scales, with disturbances in the shock position tending to follow the convection of large-scale structures in the adjoining shear layer. A consistent difference in the structure convection velocity seems to exist between the high-speed and low-speed sides of the shear layers in this study. The stream selection rule is followed for both the axisymmetric and angle-of-attack wakes before reattachment, but the recompression and reattachment processes greatly influence the structure con...