Effect of Hole-uniformity of Shrouds on Vortex Shedding Suppression behind a Circular Cylinder

5th International Conference on Mechanics and Mechatronics Research

机械制造;无线电电子学

Azmi, A.M.^1 ; Jamil, H.^1 ; Zhou, T.^2

Faculty of Mechanical Engineering, Universiti Teknologi MARA Selangor, Shah Alam Selangor

40450, Malaysia^1

School of Civil, Environmental and Mining Engineering, University of Western Australia, 35 Stirling Highway, Crawley

WA

6009, United States^2

关键词: Cylinder diameters;    Cylinder wake;    Low Reynolds number;    Non-uniform;    Passive flow control;    Unsteady wake;    Vortex formation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/417/1/012036/pdf
DOI  :  10.1088/1757-899X/417/1/012036

来源: IOP

【 摘 要 】

A passive flow control method over a circular cylinder using perforated shrouds was computationally investigated to manipulate the unsteady wake behind the circular cylinder for vortex shedding suppression. The perforated shrouds were of 33% porosity with uniform and non-uniform holes. The computation was performed at low Reynolds number (based on the circular cylinder diameter), Re = 300. The objective of the study is to examine the effect of hole-uniformity of the perforated cylinders on the vortex shedding behind the circular cylinder. It was found that both perforated shrouds (uniform and non-uniform holes) significantly suppressed the vortex shedding behind the cylinder, although with an increased drag due to normalization according to cylinder diameter. The perforated shrouded cylinder with non-uniform holes has longer vortex formation length, suppressing vortex better than that of the uniform holes distribution. The intensity of vortices behind the shrouded cylinder wake with non-uniform holes was also considerably smaller than that of the uniform holes.