Abstract
Disturbances propagation processes are investigated in two-dimensional boundary layers for the case of strong viscous-inviscid interaction. The speed of upstream disturbances propagation as a function of specific heat ratio and Prandtl number is determined. Formula for speed propagation is developed on the basis of characteristics and subcharacteristics analysis corresponding to the gasdynamic wave processes and processes of convection and diffusion.
Highlights
Disturbances propagation in the boundary layers is associated with the processes of convection and diffusion [1]
Analysis of three-dimensional boundary layer equations [2] showed that the characteristics of this system of equations are lines normal to the streamlined surface
These effects are associated with the processes of diffusion, which in reduced boundary layer equations take place in one direction
Summary
Disturbances propagation in the boundary layers is associated with the processes of convection and diffusion [1]. Mathematical model describing disturbances propagation, implies that the pressure distribution is determined by viscous-inviscid interaction processes. Analysis of disturbances propagation in three-dimensional boundary layers for strong interaction led to determination of appropriate subcharacteristic surfaces [8], separating the field of subcritical flow (subsonic in average) and supercritical flow (supersonic in average) in hypersonic boundary layer near the delta wing. Unsteady flows in laminar boundary layers are investigated for the regime of strong viscous-inviscid interaction with the special emphasis on Prandtl number and specific heat ratio influence. Such results have not been obtained before
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