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Riblet-assisted control of transformation of the Λ-structure into a turbulent spot

Valery Chernoray (Institutionen för tillämpad mekanik) ; Yu.A. Litvinenko ; V.V. Kozlov ; Lennart Löfdahl (Institutionen för tillämpad mekanik) ; G.R. Grek ; H.H. Chun
Thermophysics and Aeromechanics (0869-8643 ). Vol. 12 (2005), 4, p. 539-548.
[Artikel, refereegranskad vetenskaplig]

Experimental results are presented on transformation of a solitary Λ-structure into a turbulent spot and control of this process by means of riblets on the wetted surface in the boundary layer on a flat plate. It is shown that riblets exert a stabilizing effect on transformation of the Λ-structure into a turbulent spot. The Λ-structure on a smooth surface is shown to stretch in the streamwise direction and transform into a hairpin vortex, which becomes a turbulent spot further downstream. The intensity of the Λ-structure on riblets first increases and then decays further downstream, reaching less than half its value on a smooth surface. Finally, the Λ-structure decays on riblets without forming a turbulent spot.

Denna post skapades 2006-10-11. Senast ändrad 2013-06-18.
CPL Pubid: 22735


Institutioner (Chalmers)

Institutionen för tillämpad mekanik



Chalmers infrastruktur