Autooscillations Branched off from the Neutral Curve in the Supersonic Boundary Layer

The soft and hard regimes of generation of periodic fluctuations in the supersonic boundary layer at moderate (M = 2) and high (M = 5.35) Mach numbers are investigated within the framework of weakly nonlinear theory. The model includes both the effects of self-action which are inherent in incompress...

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Bibliographic Details
Published in:Fluid dynamics 2020-05, Vol.55 (3), p.323-331
Main Authors: Gaponov, S. A., Terekhova, N. M.
Format: Article
Language:English
Subjects:
Classical and Continuum Physics
Classical Mechanics
Compressible flow
Computational fluid dynamics
Engineering Fluid Dynamics
Fluid flow
Fluid- and Aerodynamics
Incompressible flow
Incompressible fluids
Periodic variations
Physics
Physics and Astronomy
Supersonic boundary layers
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Summary:The soft and hard regimes of generation of periodic fluctuations in the supersonic boundary layer at moderate (M = 2) and high (M = 5.35) Mach numbers are investigated within the framework of weakly nonlinear theory. The model includes both the effects of self-action which are inherent in incompressible fluid flows (generation of secondary steady-state harmonics and generation of double-frequency perturbations) and the cubic terms of original fluctuations appearing only for compressible gas. The study of the nature of generation of periodic regimes in the neighborhood of the neutral curve in compressible flows is useful since it can lead to new results that are necessary for understanding the laminar-turbulent transition laws.
ISSN:0015-4628
1573-8507
DOI:10.1134/S0015462820020032