FLOW LAMINARIZATION ON A SWEPT WING USING SLIDING ROUGHNESS ELEMENTS IN A HIGH-DISTURBANCE ENVIRONMENT
A. V. Boiko, V. I. Borodulin, A. V. Ivanov, D. A. Mishchenko, A. D. Cherepanov
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: swept wing, boundary layer control, surface roughness, crossflow instability, laminar-turbulent transition
Abstract
Quantitative thermography is used to study the effect of streamwise-orientated, quasi-two-dimensional roughness elements (strips) on the laminar-turbulent transition location on a 45° swept wing model under various test conditions. The efficacy of these sliding roughness elements for flow laminarization is investigated under elevated freestream turbulence levels and increased surface roughness. The results demonstrate that this laminarization method is also robust to moderate variations in the freestream velocity.
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