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

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$^{\circ}$ 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.

Keywords: swept wing, boundary layer control, surface roughness, crossflow instability, laminar-turbulent transition.

UDC: 532.526.3

Received: 30.05.2025
Revised: 30.05.2025
Accepted: 02.06.2025

DOI: 10.15372/PMTF202515677

 English version: Journal of Applied Mechanics and Technical Physics, 2025, 66:5, 946–955

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