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Secondary instability of a swept-wing boundary layer disturbed by controlled roughness elements

Valery Chernoray (Institutionen för tillämpad mekanik, Strömningslära) ; A. V. Dovgal ; V. V. Kozlov ; Lennart Löfdahl (Institutionen för tillämpad mekanik, Fordonssäkerhet)
Journal of Visualization (1343-8875). Vol. 13 (2010), 3, p. 251-256.
[Artikel, refereegranskad vetenskaplig]

Wind-tunnel data on velocity perturbations evolving in a laminar swept-wing flow under low subsonic conditions are reported. The focus of the present experiments are secondary disturbances of the boundary layer which is modulated by stationary streamwise vortices. Both the stationary vortices and the secondary oscillations of interest are generated in a controlled manner. The experimental data are obtained through hot-wire measurements. Thus, evolution of the vortices, either isolated or interacting with each other, is reconstructed in detail. As is found, the secondary disturbances, initiating the laminar-flow breakdown, are strongly affected by configuration of the stationary boundary-layer perturbation that may have an implication to laminar-turbulent transition control.

Nyckelord: Swept wing, Streamwise vortices, Secondary instabilities, Transition, control, cross-flow vortices, transition, stability, growth



Denna post skapades 2010-08-11. Senast ändrad 2016-08-22.
CPL Pubid: 124351

 

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