Experimental and numerical study of nonequilibrium ultraviolet NO and N2+ emission in shock layer

The results on an investigation of nonequilibrium uv radiation in the systems of molecular hands NO and N-2(+)(1-) in a shock layer in air are presented. The studies included the experiments on a measurement of the nonequilibrium radiation behind a strong shock wave in an electric are-driven shock tube within the range of shock-wave velocity change V-s = 5 to 10 km/s at the initial air pressure P-1 = 0.1 torr, and numerical simulation of radiation processes behind the shock wave and in a hypersonic viscous shock layer, where the now was 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. Examples of emission calculations in the NO and N-2(+)(1-) systems for the conditions of a flight test are presented.