Stabilization of controlled disturbances in a supersonic boundary layer by slots
V.I. Lysenko, B.V. Smorodsky, A.D. Kosinov, A.A. Yatskikh, L.V. Afanayev
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: compressible boundary layer, hydrodynamic stability, slots
Abstract
A pioneering study of the influence of longitudinal slots (grooves) with different depths h (corresponding to the Reynolds numbers Reh = 900 and 1300) on the stability of a supersonic (Mach number М = 2) boundary layer on a flat plate to controlled disturbances of the first (vortex) mode of instability determining the laminar-turbulent transition at М = 2 is performed. At the Reynolds numbers Re h = 900 and 1300, the growth rates of three-dimensional disturbances at the frequency ƒ = 14 kHz are found to be smaller than the corresponding value for the smooth plate. Thus, it is shown that controlled disturbances of the first mode can be stabilized by longitudinally aligned slots with a small depth (Reh < 1500).
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