Abstract:
Johannesen has discussed a Rayleigh-line method for the analysis of vibrational relaxation regions in shock waves. In this method the flow of the real gas in the relaxation region is treated as the flow of an ideal gas (termed the α-gas by Johannesen) with heat extraction. The Rayleigh-line method is readily adapted for use on a computer; programs based on this method have been used to deal with experimental data for CO2-He mixtures and N20, and also to provide tables of equilibrium conditions for pure C02 and N20. Conditions (a) immediately behind the diffusion resisted part of the wave are found using the normal shock relations for the ideal gas and the known conditions (1) in front of the shock wave. The Mach number m, of the α-gas is related to the Mach number Mα of the real gas.
