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Thermophysics and Aeromechanics

2021 year, number 3

Experimental study of the influence of external disturbances on the position of the laminar-turbulent transition on swept wings at М = 2

Yu.G. Ermolaev, A.D. Kosinov, V.L. Kocharin, A.N. Semenov, N.V. Semionov, S.A. Shipul, A.A. Yatskikh
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: supersonic boundary layer, swept wing, laminar-turbulent transition, transition Reynolds number, vortex disturbances

Abstract

The influence of external vortex disturbances on the position of the laminar-turbulent transition in boundary layers on swept wings at the Mach number M = 2 is experimentally studied. The experiments are performed with two wing models; the sweep angles of the leading edges are 45° and 72°. The vortex disturbances are generated by a wire placed ahead of the nozzles in the subsonic part of the flow. It is found that such disturbances increase the amplitude and change the spectral composition of oscillations in the boundary layer; moreover, they can induce earlier turbulization of the flow.