THE PROPAGATION OF PERTURBATIONS IN SUPERSONIC BOUNDARY-LAYERS

Unsteady processes involving the propagation of perturbations in two-d imensional boundary layers are analysed in the strong interaction regi me. A system of characteristics and subcharacteristics corresponding t o wave processes in gas dynamics as well as convection and diffusion p rocesses is determined. A system of equations describing the processes of weak interactions between the flow in a laminar boundary layer and an external supersonic flow near a cooled surface is analysed. For a flow described by the self-similar system of equations for the boundar y layer, the velocity of propagation of perturbations as a function of a temperature factor is determined from a numerical solution. Copyrig ht (C) 1996 Elsevier Science Ltd.