Influence of porous-coating thickness on the stability and transition of flat-plate supersonic boundary layer
S.A. Gaponov, Yu.G. Ermolaev, A.D. Kosinov, V.I. Lysenko, N.V. Semenov, and B.V. Smorodskii
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
vl@itam.nsc.ru
Keywords: porosity, compressible boundary layer, laminar-turbulent transition, hydrodynamic stability
Pages: 555-560
Abstract
In the present study, we examined, both experimentally and theoretically, the influence of porous-coating thickness on the stability and laminar-turbulent transition of flat-plate supersonic boundary layer at free-stream Mach number M∞ = 2. A qualitative agreement between the data calculated by the linear theory of stability and the experimental data on the transition obtained for models with different porous-coating thicknesses was established. We show that with decreasing (within a certain interval) the porous-coating thickness the boundary layer becomes more stable to perturbations, and the laminar-turbulent transition, more delayed.
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