Nonequilibrium shock-layer radiation in the systems of molecular bands NO and N2(+)(1-) - Experimental study and numerical simulation

Abstract

The results of investigation of nonequilibrium air radiation in a shock layer of the systems of molecular bands NO and N^O-) are presented. The studies included the experiments on a measurement of the nonequilibrium radiation behind a strong shock wave in the Electric Arc-driven Shock Tube within the range of shock wave velocity change Vs = 5 to 10 km/s at the initial air pressure Pl = 0.1 torr and numerical simulation of radiation processes behind the shock wave and hi a hypersonic viscous shock layer, where nonequilibrium processes were simulated on the basis of Navier-Stokes equations. A numerical model of the radiation behind the strong shock wave has been used to verify a kinetic scheme of radiation processes by comparison with experimental results. The examples of emission calculations in the systems NO and N£ (1-) for the conditions of flight test described in Ref. 1 are presented.