The Formation of Vortex Structures in a Screen Cylinder Wake

Azlin Mohd Azmi, Yucen Lu, Tongming Zhou

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

1 Citation (Scopus)

Abstract

The formation of vortex structures in a screen cylinder wake was investigated in a wind tunnel at a Reynolds number of 7000. The screen cylinder was made of a stainless steel wire mesh with an open area ratio of 67%. The results showed that the screen cylinder wake could be classified into two distinct regions. The first region was characterised by the development of the shear layer vortices which resulted from Kelvin-Helmholtz instability. At about x/d = 2 0 (where d is the diameter of the cylinder) the shear layer vortices started to interact with each other across the centreline, and evolved downstream to form the alternately arranged 'large-scale' coherent structures. These structures were most pronounced at x/d = 40. The vortex formation region was therefore extended significantly downstream compared with that of the solid cylinder wake. The second region involved a gradual decay of the fully-formed large-scale structures, evidenced by the weak vorticity exchange across the wake centreline.

Original languageEnglish
Title of host publicationIOP Conference Series: Materials Science and Engineering
EditorsYong Zhao
Place of PublicationUnited Kingdom
PublisherIOP Publishing
Volume234
DOIs
Publication statusPublished - 8 Sep 2017
Event2017 International Conference on Advanced Technologies in Design, Mechanical and Aeronautical Engineering - Singapore, Singapore
Duration: 12 Jul 201714 Jul 2017

Publication series

NameIOP Conference Series: Materials Science and Engineering
PublisherIOP Publishing
ISSN (Print)1757-8981

Conference

Conference2017 International Conference on Advanced Technologies in Design, Mechanical and Aeronautical Engineering
Country/TerritorySingapore
CitySingapore
Period12/07/1714/07/17

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