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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Interaction between the near wake and the cross-section variation of a circular cylinder in uniform flow
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Interaction between the near wake and the cross-section variation of a circular cylinder in uniform flow

机译：均匀流动下圆柱的近尾流与截面变化之间的相互作用

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摘要

The flow around a circular cylinder with a cross-section variation is experimentally investigated. Particle Image Velocimetry (PIV) is used to scrutinize the interaction of the cylinder's wall with its near wake. The Reynolds number based on the cylinder's diameter and freestream velocity is 80 x10(3), corresponding to the upper subcritical flow regime. At a forcing Strouhal number of St (f) = 0.02, the maximum vorticity level around the cylinder is reduced by more than 50% as compared to its uncontrolled value. The topology of the bulk flow confined between the primary vortical structure and the cylinder surface is modified resulting in substantial drag reduction.
机译：实验研究了截面变化在圆柱体周围的流动。粒子图像测速（PIV）用于检查圆柱壁与其近尾流之间的相互作用。基于气缸直径和自由流速度的雷诺数为80 x10（3），对应于上亚临界流动状态。在强制Strouhal数St（f）= 0.02时，圆柱体周围的最大涡度与其非控制值相比降低了50％以上。限制在主要涡流结构和圆柱体表面之间的总体流动的拓扑结构导致了大幅度的阻力减少。

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