Abstract.
A new preferential vibration-dissociation-exchange reactions coupling model – labelled CVDEV – resulting from an extension of the well-known Treanor and Marrone CVDV model, has been derived to take into account the coupling between the vibrational excitation of the \(N_{2}\) and \(O_{2}\) molecules and the two Zeldovich exchange reactions. Analytical expressions for the exchange reactions coupling factor and for the average vibrational energy lost – or gained – by a molecule through an exchange reaction have been developed. The influence of such a coupling has been shown by means of numerical simulations of hypersonic air flows through normal and bow shock waves. Code-to-code comparisons between our model and other recent approaches have been conducted. The infrared radiation of nitric oxide behind a normal shock wave resulting from computations with the CVDEV model has been compared with other coupling model results and to recent shock tube experimental data. These comparisons have shown a good agreement of our model results with the experimental data. In this context, the results show the prominent influence of \(N_{2}\) vibration coupling on the first Zeldovich reaction, and the absence of \(O_{2}\) vibration coupling effects on the second Zeldovich reaction.
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Received 30 June 1997 / Accepted 3 December 1997
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Séror, S., Schall, E., Druguet, MC. et al. An extension of CVDV model to Zeldovich exchange reactions for hypersonic non-equilibrium air flows. Shock Waves 8, 285–298 (1998). https://doi.org/10.1007/s001930050121
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DOI: https://doi.org/10.1007/s001930050121