Measurements of Fluctuating Pressures on a Circular Cylinder in Subsonic Crossflow
Measurements of Fluctuating Pressures on a Circular Cylinder in Subsonic Crossflow
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DOI：
10.2514/1.40954
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发表时间：
2009-09
期刊：
影响因子：
2.5
通讯作者：
J. Ackerman;J. Gostelow;A. Rona;W. Carscallen
中科院分区：
文献类型：
--
作者：
J. Ackerman;J. Gostelow;A. Rona;W. Carscallen
在亚音速范围内的横流中测试了一个圆柱体。时间分辨压力分布提供了地表压力波动的信息；给出了相应的阻力系数和基本阻力系数。在低马赫数下测量的基压波动与其他研究人员的发现一致。描述了高亚音速和跨音速范围内的流动变化。插图是从其他研究人员的观察中绘制的，使物理解释能够被给出，以帮助对问题进行更一般的建模。在马赫数高于0.6时，旋涡强度的变化降低了基本阻力系数，直至马赫数为0.9，此时声速流动的开始增加了阻力。并与其他作者的测量结果进行了比较。本文的重点是在亚音速范围内提供涡脱落和基压的可靠测量，而不是试图提供普遍的相关性。
A circular cylinder is tested in crossflow over the subsonic speed range. Time-resolved pressure distributions give information on surface pressure fluctuations; the corresponding drag and base drag coefficients are provided. Measured base pressure fluctuations at low Mach numbers are in agreement with the findings of other researchers. Flow changes at higher subsonic velocities and into the transonic range are described. Illustrations are drawn from the observations of other researchers, enabling physical explanations to be given to assist toward a more general modeling of the problem. At Mach numbers above 0.6 the changing strength of the vortices reduces the base drag coefficient up to a Mach number of 0.9, at which the onset of sonic flow increases the drag. Strouhal number variation is compared with the measurements of other authors. The paper concentrates on providing reliable measurements of vortex shedding and base pressure over the subsonic speed range rather than attempting to provide universal correlations.