Effects of Goertler Vortices, Wall Cooling and Gas Dissociation on the RayleighInstability in a Hypersonic Boundary Layer

摘要

In a hypersonic boundary layer over a wall of variable curvature, the region mostsusceptible to Goertler vortices is the temperature adjustment layer sitting at the edge of the boundary layer. This temperature adjustment layer is also the most dangerous site for Rayleigh instability. This paper investigates how the existence of large amplitude Goertler vortices affects the growth rate of Rayleigh instability. The effects of wall cooling and gas dissociation on this instability are also studied. We find that all these mechanisms increase the growth rate of Rayleigh instability and are therefore destabilizing.