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首页> 外文期刊>Archive of Applied Mechanics >Force coefficients and Strouhal numbers of three circular cylinders subjected to a cross-flow
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Force coefficients and Strouhal numbers of three circular cylinders subjected to a cross-flow

机译：横流作用下三个圆柱的力系数和斯特劳哈尔数

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摘要

In this paper, wind tunnel experiments were conducted to measure the mean force coefficients and Strouhal numbers for three circular cylinders of equal diameters in an equilateral-triangular arrangement when subjected to a cross-flow. These experiments were carried out at five subcritical Reynolds numbers ranging from 1.26 x 104 to 6.08 x 104. The pressure distributions on the surface of the cylinders were measured using pressure transducers. Furthermore, the hot-wire anemometer was employed to measure the vortex shedding frequencies behind each cylinder. Six spacing ratios (l/d) varying from 1.5 to 4 were investigated. It is observed that for l/d > 2, the upstream cylinder experiences a lower mean drag coefficient compared with the downstream cylinders. The minimum values of the drag coefficient for the downstream cylinders occur at l/d = 1.5 and l/d = 2, because there is no vortex shedding from the foregoing cylinders. Also, the value of the pressure coefficient behind the upstream cylinder reduces by increasing l/d. Moreover, by decreasing the value of l/d, the Strouhal number for the upstream cylinder increases. It can be concluded that the flow pattern and aerodynamic coefficients are basically dependent on l/d; in other words, decreasing l/d results in an increase in the effects of the flow interference between the cylinders.
机译：在本文中，进行风洞实验来测量等边三角形排列的三个等直径圆柱体在受到横流作用时的平均力系数和Strouhal数。这些实验是在1.26 x 104至6.08 x 104的五个亚临界雷诺数下进行的。使用压力传感器测量了圆柱体表面的压力分布。此外，采用热线风速仪测量每个圆柱体后面的涡旋脱落频率。研究了从1.5到4的六个间距比（l / d）。可以看出，当l / d> 2时，上游气缸的平均阻力系数要低于下游气缸。下游气缸的阻力系数的最小值出现在l / d = 1.5和l / d = 2处，因为上述气缸没有涡旋脱落。而且，上游气缸后面的压力系数值会通过增加l / d来减小。而且，通过减小l / d的值，用于上游气缸的斯特劳哈尔数增加。可以得出的结论是，流型和空气动力学系数基本上取决于l / d。换句话说，减小l / d导致气缸之间的流动干涉的影响增加。

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