Turbulence Effects on Drag of Sharp-Edged Bodies
Turbulence Effects on Drag of Sharp-Edged Bodies
复制标题
湍流对锐边物体阻力的影响
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
M. Stine
中科院分区：
文献类型：
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作者：
J. Roberson;Chi Lin;Scott G. Rutherford;M. Stine
与一般观点相反，风洞试验表明，角形体的阻力系数受自由流湍流强度的显著影响。对于某些物体，强度的增加导致C D的增加，而对于另一些物体，C D的减少导致C D的增加。在具有类似于H梁的形状的振动体上进行的测试表明，随着自由流湍流的增加，振动的振幅增加超过200%。阻力系数C D的变化归因于两个主要效应。第一个是在分离表面的区域中的增加的雷诺应力，这似乎导致C D的增加，另一个是流重新附着到主体，这可能导致C D根据主体的形状而增加或减少。这些试验中的雷诺数范围仅限于约5 x 103至7 x 104的相对较窄的跨度。
Contrary to popular opinion, wind tunnel tests showed that the drag coefficient of angular shaped bodies is significantly affected by the intensity of the free stream turbulence. For some bodies an increase in intensity causes an increase in C D while for others a decrease in C D results. Tests made on a vibrating body having a shape similar to an H beam showed that the amplitude of vibration was increased more than 200% with an increase in free stream turbulence. The change in coefficient of drag C D is attributed to two primary effects. The first is increased Reynolds stress in the region of the surface of separation which appears to cause an increase in C D and the other is reattachment of the flow to the body which may cause the C D to increase or decrease depending upon the shape of the body. The range of Reynolds numbers in these tests is limited to the relatively narrow span from approximately 5 x 103 to 7 x 104.