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Journal of Visualization

Erschienen in:

01.02.2011 | Regular Paper

Effects of roughness elements on bypass transition induced by a circular cylinder wake

verfasst von: J. J. Wang, C. Zhang, C. Pan

Erschienen in: Journal of Visualization | Ausgabe 1/2011

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Abstract

The bypass transition of flat-plate boundary layer induced by a circular cylinder wake under the influence of roughness elements is experimentally investigated. The hydrogen-bubble visualization results show that the boundary layer separation occurs upstream of the roughness, and the separated shear layer is incised by roughness to different extent, resulting in different kinds of secondary vortices formed immediately downstream of the roughness. During the evolution of the secondary vortex, two types of instabilities are observed, which are denoted as large- and small-scale instabilities, respectively, according to different spatial scale of the hairpin vortices formed afterward. A merging process of hairpin vortices is also observed when the secondary vortices undergo the small-scale instability, and a potential new transition control strategy based on the present observation is proposed.

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Vorheriger Artikel Analysis of jet entrainment mechanism in the transitional regime by time-resolved PIV

Nächster Artikel Investigation on the flameholding mechanisms in supersonic flows: backward-facing step and cavity flameholder

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Titel: Effects of roughness elements on bypass transition induced by a circular cylinder wake
verfasst von: J. J. Wang
C. Zhang
C. Pan
Publikationsdatum: 01.02.2011
Verlag: Springer-Verlag
Erschienen in: Journal of Visualization / Ausgabe 1/2011
Print ISSN: 1343-8875
Elektronische ISSN: 1875-8975
DOI: https://doi.org/10.1007/s12650-010-0063-9

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