Experimental study on vortex characteristic of screen cylinders with different porosity

Difei Xiao, Chenlin Sun, Azlin Mohd Azmi, Hongjun Zhu, Tongming Zhou

Research output: Chapter in Book/Conference paperConference paperpeer-review

Abstract

Experiments were conducted in a wind tunnel to study the wake vortex characteristics of two screen cylinders with porosities of 37% and 61% at a Reynolds number of about 7000. The results showed that the wake vortex formation mechanisms were completely different for these two cylinders. The screen cylinder with porosity  = 37% resembles that of a bare cylinder and the wake is formed due to wake instability while that of β = 61% is formed due to shear-layer (Kelvin-Helmholtz) convective instability which involves merging through pairing and tripling of the small-scale vortices within the shear layers. These results are supported by the evolution of the peak frequency on the energy spectra in the streamwise direction.
Original languageEnglish
Title of host publicationProceedings of the 22nd Australasian Fluid Mechanics Conference AFMC2020
EditorsHubert Chanson, Richard Brown
Place of PublicationBrisbane
PublisherUniversity of Queensland
Number of pages4
ISBN (Electronic)9781742723419
DOIs
Publication statusPublished - 2020
Event 22nd Australasian Fluid Mechanics Conference - Brisbane, Australia
Duration: 7 Dec 202010 Dec 2020

Conference

Conference 22nd Australasian Fluid Mechanics Conference
Abbreviated titleAFMC2020
Country/TerritoryAustralia
CityBrisbane
Period7/12/2010/12/20

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