Supersonic flow of viscous gas in a flat channel at high Reynolds number

The flow field structure and aerodynamic characteristics of a flat channel with the cross section variable plane by the Mach number at the input, equal to four,within the Reynolds number range Re = 105-107 are studied on the basis of analysis of the Reynolds two-dimensional equations. The interaction of the contraction jump with the laminar boundary layer leads to formation of the closed break-off zone. Two flow schemes - the continuous and break-off ones - are possible by interaction with the turbulent boundary layer, depending on the intensity of the contraction falling jump. It is shown that the scheme of the contraction jump regular reflection from the flat plane corresponds to the continuous interaction. The flow scheme with formation of a small closed break-off zone, wherein the subsonic circulation flow takes place, corresponds to the continuous interaction