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Stability of supersonic boundary layer on permeable surface

Gaponov S. A., Ermolaev Yu. G., Kosinov A. D., Lysenko V. I., Semionov N. V., Smorodsky B. V.

Archives of Mechanics

2014

Vol. 66, nr 6

453--466

In the present study we have performed combined theoretical and experimental investigation of the surface permeability influence on the linear stability of the supersonic flat-plate boundary layer at free-stream Mach number M = 2. Good quantitative agreement was obtained between the data calculated by the linear theory of stability and the data obtained in experiments with artificially generated disturbances performed on models with various porous inserts.

Absolute instability in the compressible boundary layer of the rotating cone

Tuliszka-Sznitko E.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

1999

nr 9

151-156

In the present paper the instability character (absolute/convective) of compressible viscous flow around geometries rotating in uniform flow is analyzed. The linear local stability theory is used to investigate the boundary layer stability. Following the works of Briggs and Bers in the field of plasma physics, the absolute instability region is identified by singularities of dispersion relation called pinch - points. Calculations have been made for different Mach numbers and wall temperatures.