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Adverse pressure gradient effect on nonlinear varicose instability of a streaky structure in an unswept wing boundary layer

Yu.A. Litvinenko ; Valery Chernoray (Institutionen för tillämpad mekanik) ; V.V. Kozlov ; G.R. Grek ; Lennart Löfdahl (Institutionen för tillämpad mekanik) ; H.H. Chun
Physics of Fluids Vol. 17 (2005),
[Artikel, refereegranskad vetenskaplig]

Nonlinear varicose instability of a streaky structure is experimentally investigated in a wing boundary layer. Spatial evolution of the streaky structure perturbed by high-frequency traveling waves is compared at zero and adverse streamwise pressure gradients. The process of streak multiplication and generation of ?-shaped vortices is under examination. Results obtained testify to the strong influence of pressure gradient upon the breakdown of the streaky structure due to its varicose instability.



Denna post skapades 2006-10-11.
CPL Pubid: 22733

 

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