Intrinsic stationary perturbations in the gas boundary layer
S.A. Gaponov
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: supersonic flow, boundary layer, stationary perturbation, amplitude, phase, longitudinal structures
Abstract
Stationary perturbations of equations of the boundary layer stability are studied for subsonic and supersonic flow past a plate. For two-dimensional perturbations, the results obtained are in good agreement with existing literature data. Three-dimensional perturbations resembling longitudinal structures are studied for the first time. It is established that the amplitude of boundary layer perturbations of longitudinal velocity and temperature has a bell-shaped form, whose maxima position in the Dorodnitsyn-Howarth variables is conservative with respect to changes in the Mach number, Reynolds number, and wave number along the lateral coordinate. Moreover, the intensity of perturbation attenuation along the longitudinal coordinate and the phase shift of the boundary layer perturbation increase with an increase in the above quantities. The largest phase changes are observed for the lateral velocity.
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