Study of the incipient spot breakdown controlled by riblets

V. G. Chernoray; G. R. Grek; V. V. Kozlov; Yu. A. Litvinenko

doi:10.1051/eucass/201203545

All issues

Volume 3 (2012)

10.1051/eucass/201203545

Abstract

Open Access

Issue		Volume 3, 2012 Progress in Flight Physics


Page(s)		545 - 556
Section		Chapter Six. Flow Control
DOI		https://doi.org/10.1051/eucass/201203545
Published online		29 January 2013

Progress in Flight Physics 3 (2012) 545-556

Study of the incipient spot breakdown controlled by riblets

V. G. Chernoray¹, G. R. Grek¹, V. V. Kozlov² and Yu. A. Litvinenko²

¹ Applied Mechanics Chalmers University of Technology Gothenburg 41296, Sweden
² Institute of Theoretical and Applied Mechanics Siberian Branch of the Russian Academy of Sciences Novosibirsk 630090, Russia

Abstract

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