Active control of hypersonic shock layer disturbances

Abstract

This is a brief review of the investigations of receptivity and control of hypersonic shock layers. The present paper describes comprehensive numerical and experimental investigations of evolution of disturbances generated in the hypersonic viscous shock layer (VSL) on a §at plate by external acoustic waves and by perturbations introduced into the shock layer from the surface of model. The active control of intensity of pulsations is possible because both external acoustic waves and the periodic controlled disturbances introduced on the plate surface generate, in a shock layer, entropy-vorticity disturbances with identical spatial distributions and phase velocities.