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Spatial hot-wire visualization of the Lambda-structure transformation into the turbulent spot on the smooth flat plate surface and riblet effect on this process

Valery Chernoray (Institutionen för tillämpad mekanik, Strömningslära) ; G. R. Grek ; V. V. Kozlov ; Y. A. Litvinenko
Journal of Visualization (1343-8875). Vol. 13 (2010), 2, p. 151-158.
[Artikel, refereegranskad vetenskaplig]

Evolution of the Lambda-vortex and its transformation into the turbulent spot in a flat plate boundary layer are investigated experimentally. Extensive measurements visualizing the Lambda-structure transformation into the turbulent spot on the smooth and ribbed surfaces of the flat plate are presented. The flow behavior in the course of spatial evolution of the Lambda-structure and turbulent spot is discussed. Specific features of the downstream evolution of Lambda-structure and turbulent spot on the smooth and ribbed surfaces are demonstrated, such as suppression by riblets of the Lambda-vortex transformation into the turbulent spot, appearance of the coherent structures of Lambda-vortex within ensemble-averaged turbulent spot, and oblique waves generation both by the Lambda-vortex and turbulent spot.

Nyckelord: Visualization, Hot-wire anemometry, Lambda-structure, Turbulent spot, Riblets



Denna post skapades 2010-06-01.
CPL Pubid: 122163

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Strömningslära

Ämnesområden

Fysik
Strömningsmekanik

Chalmers infrastruktur