EXPERIMENTAL INVESTIGATION OF THE WALL PRESSURE FLUCTUATIONS IN SUBSONIC SEPARATED FLOWS
EXPERIMENTAL INVESTIGATION OF THE WALL PRESSURE FLUCTUATIONS IN SUBSONIC SEPARATED FLOWS
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亚音速分离流壁面压力脉动的实验研究
DOI：
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发表时间：
1967
期刊：
影响因子：
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通讯作者：
A. Mohsen
中科院分区：
文献类型：
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作者：
A. Mohsen
摘要：本文给出了亚音速湍流分离流的静压、脉动壁压和平均速度分布的实验测量结果。分离由三种几何构型引起：1/2、1和1-1/2英寸高的后向台阶; 1/2和1英寸高的前向台阶;以及1/2和1英寸高的栅栏。对170、280和370英尺/秒的自由流速度进行了测量。结果发现，基本压力是雷诺数无关。分离长度与速度无关，与引起流动分离的结构高度成比例。与分离流相关联的壁面压力波动的幅值高于附着湍流边界层所引起的幅值，并在再附着附近达到最大值。
Abstract : Experimental measurements of static pressures, fluctuating wall pressures, and mean velocity profiles are presented for subsonic turbulent separated flows. Separation was induced by three types of geometrical configurations: Backward-facing steps 1/2, 1, and 1-1/2 inches high; forward- facing steps 1/2 and 1 inch high; and fences 1/2 and 1 inch high. Measurements were made for free stream velocities of 170, 280, and 370 ft/sec. It was found that the base pressure was essentially Reynolds number independent. The separation length was independent of speed and proportional to the height of the configuration causing flow separation. The wall pressure fluctuations associated with the separated flows were of higher magnitudes than those caused by attached turbulent boundary layers and reached maximum values near reattachment.