Separated flow about lifting bodies and impulsive flow about cylinders.
Separated flow about lifting bodies and impulsive flow about cylinders.
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升力体的分离流和气缸的脉冲流。
DOI：
10.2514/3.3453
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发表时间：
1966
期刊：
影响因子：
2.5
通讯作者：
T. Sarpkaya
中科院分区：
文献类型：
--
作者：
T. Sarpkaya
本文讨论了在亚音速到中等超音速范围内，圆柱和平板上的冲击流与细长体大迎角运动时的分离流之间的相似性。横流阻力系数和法向力系数的实验确定为随时间变化的二维流动中的流体的相对位移的函数。体尾流特性随时间的演变由高速运动图像确定。结果表明，在对称涡的生长过程中，试验体的层流阻力系数达到比其相应的定常流值高25%左右的值。在超临界范围内，阻力的记录显示出相当大的分歧，除了阻力系数位于0.25和0.40之间。
The analogy between the impulsive flow over circular cylinders and flat plates and the separated flow about slender bodies moving at high angles of attack in the subsonic to moderately supersonic-velocity range is discussed. The cross-flow drag and normal force coefficients are determined experimentally as a function of the relative displacement of fluid in time-dependent two-dimensional flow. The evolution with time of the body-wake characteristics are determined from high-speed motion pictures. The results show that during the growth of symmetrical vortices, the laminar flow drag coefficients of the test bodies reach a value about 25% higher than their corresponding steady flow values. In the supercritical range, records for the drag show considerable disagreement, except that the drag coefficient lies between 0.25 and 0.40.