VORTEX SHEDDING FROM SPHERES
VORTEX SHEDDING FROM SPHERES
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DOI：
10.1017/s0022112074000644
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发表时间：
1974-01-01
影响因子：
3.7
通讯作者：
ACHENBACH, E
中科院分区：
文献类型：
--
作者：
ACHENBACH, E
在雷诺数400 < Re < 5 × 10 ~ 6范围内研究了球体的旋涡脱落。在低雷诺数下，即Re = 3 × 103时，Möller（1938）测量的Strouhal数作为雷诺数的函数的值已经用水流得到了证实。最早由Cometta（1957）报道的较低临界雷诺数为Re = 6 × 103。在这里，斯特劳哈尔数和雷诺数之间的关系的不连续性是明显的。从Re = 6 × 103到Re = 3 × 105，尾流中观察到强烈的周期性波动。在上临界雷诺数（Re = 3.7 × 105）以上，用现有的测量技术不能探测到周期性的旋涡脱落，热线测量表明，在75°圆（垂直于流动方向）上的不同位置同时记录的信号显示出相移。因此，看起来旋涡分离点围绕球体旋转。试图解释这个实验证据。
Vortex shedding from spheres has been studied in the Reynolds number range 400 < Re < 5 × 106. At low Reynolds numbers, i.e. up to Re = 3 × 103, the values of the Strouhal number as a function of Reynolds number measured by Möller (1938) have been confirmed using water flow. The lower critical Reynolds number, first reported by Cometta (1957), was found to be Re = 6 × 103. Here a discontinuity in the relationship between the Strouhal and Reynolds numbers is obvious. From Re = 6 × 103 to Re = 3 × 105 strong periodic fluctuations in the wake flow were observed. Beyond the upper critical Reynolds number (Re = 3.7 × 105) periodic vortex shedding could not be detected by the present measurement techniques.The hot-wire measurements indicate that the signals recorded simultaneously at different positions on the 75° circle (normal to the flow) show a phase shift. Thus it appears that the vortex separation point rotates around the sphere. An attempt is made to interpret this experimental evidence.