Spatial hot-wire visualization of the Λ-structure transformation into the turbulent spot on the smooth flat plate surface and riblet effect on this process |
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Authors: | Valery G Chernoray Genrich R Grek Victor V Kozlov and Yuriy A Litvinenko |
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Institution: | (1) Applied Mechanics, Chalmers University of Technology, 412 96 Gothenburg, Sweden;(2) Institute of Theoretical and Applied Mechanics, SB RAS, 630090 Novosibirsk, Russia; |
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Abstract: | 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 surfaces
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 surfaces
are demonstrated, such as suppression by riblets of the Λ-vortex transformation into the turbulent spot, appearance of the
coherent structures of Λ-vortex within ensemble-averaged turbulent spot, and oblique waves generation both by the Λ-vortex
and turbulent spot. |
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