Time-dependent solutions of the vibrational non-equilibrium flow of CO2-N2-H2O-O2mixtures in gas dynamic lasers

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Abstract
The time-dependent method of Anderson (1970) for solving vibrational nonequilibrium flows in gas dynamic laser nozzles is investigated. Three different physical models of the CO2-N2 system are examined. These are of increasing complexity to determine the effect of more realistic conditions on the flow parameters. The mass conservation equation has been changed to its divergent form, resulting in a much smoother distribution in the mass flow parameter. Small signal gain distributions obtained from the present theory are compared with the experimental results of various research workers. In doing so the validity of using the so-called 'Sharma barrier' in determining the kinetic rates is investigated. The results show clearly the need for more accurate rate data over a larger range of temperatures than are currently available.