Abstract
Computations are presented for the variation of vibrational excitation probabilities with temperature for mixtures of O2 and N2, and of HF and H2. The values of six different excitation probabilities in each mixture are reported for temperatures up to 3000°K. For each of the probabilities there is a lower temperature limit given, below which the theory of Schwartz, Slawsky, and Herzfeld, which is used here, is not applicable. Using the results for H2–HF mixtures, we present some considerations which suggest that the expansion through the de Laval nozzle for representative H2–F2 rocket motors may be taken as vibrational near-equilibrium flow.
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