Boundary layer emission amplification on the intensively cooled walls of a Laval nozzle

A vibrationally nonequilibrium flow of a CO2-N2-H2O mixture in a Laval nozzle with intensively cooled walls is investigated numerically in the boundary layer approximation. It is shown that in the boundary layer, an inversion of the population of CO2 molecules occurs sooner than in the core of the flow. For the binary mixture CO2-N2, a positive gain coefficient is observed in the boundary layer up to the nozzle exit section (in the presence of absorption in the flow core).