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1 Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics
1 Zeszyty Naukowe Instytutu Maszyn Przepływowych Polskiej Akademii Nauk w Gdańsku

2 1999

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Linear disturbances and critical conditions in one – dimensional flow of constans media

Bilicki Z., Downar-Zapolski P.

Zeszyty Naukowe Instytutu Maszyn Przepływowych Polskiej Akademii Nauk w Gdańsku

1999

nr 505/1464

63--83

This paper investigates the influence of inertial processes on the of small disturbances and the properties of the critical flow of continuos media. The intertial processes may stem from heat and mass exchange on the component two-phase flow. Since almost all the models of a flow medium take the form of hyperbolic, quasi-linear systems of partial-differential equations, the mathematical background of the critical flow and the propagation of linear disturbances, for this type of equations, is presented. The problem of discontinuous solutions and its possible influence on the critical flow has been discussed Finally, some important differences concerning linear waves in dispersive and non-dispersive systems are discussed.

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.