Interaction of Hydrodynamic and Temperature External Disturbances with the Boundary Layer

摘要

At present in solving problems of turbulence arising in boundary layers the study of their receptivity to external disturbances acquires great significance. In this case disturbance generation in boundary layers is attributed to stationary and nonstationary factors (surface vibration acoustic waves external turbulence etc.). One of the first authors to treat this problem and to introduce the tern receptivity vas Morkovin. There are a number of experimental and theoretical studies of subsonic boundary-layer receptivity. Much less is known, however, about the receptivity of a supersonic boundary layer, with all the publications in this field being devoted to studies of interaction of acoustic waves with the boundary layer. At the same time, a supersonic flow may contain not only acoustic disturbances, but also vortical and entropy or heat waves. The interaction of those with a supersonic boundary layer has not yet been adequately investigated. The problem of receptivity of vortical disturbances at subsonic velocities has been analyzed in some publications, but there is no agreement among the authors about the mechanism of disturbance generation in the boundary layer. In this work, excitation of stationary and nonstationary waves by external hydrodynamic disturbances in subsonic and supersonic boundary layers was calculated.