COMPUTATION OF THE STABILITY CHARACTERISTICS OF A SUPERSONIC BOUNDARY LAYER ON A FLAT-PLATE MODEL WITH LONGITUDINAL SLOTS OF VARYING DEPTH
V. I. Lysenko, B. V. Smorodskii, A. D. Kosinov, A. A. Yatskikh, G. L. Kolosov, A. D. Yuzenas
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: compressible boundary layer, hydrodynamic instability, slot
Abstract
Results of the first combined computational and theoretical study of the effect of flow-aligned rectangular depressions (slots) on the surface of a flat plate on boundary-layer stability at a freestream Mach number M∞ = 2 are presented. Slots of various depths (Reynolds number 0 ≤ Reh ≤ 5400) and small width relative to the instability wavelength are considered. The mean flow is obtained using the FlowVision computational fluid dynamics package. Linear stability theory calculations reveal that increasing slot depth shifts the frequency range of boundary-layer instability toward higher frequencies. The spatial growth rates of the disturbances become lower than those for a boundary layer over a smooth surface, indicating flow stabilization.
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