An extension of CVDV model to Zeldovich exchange reactions for hypersonic non-equilibrium air flows |
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Authors: | S Séror E Schall M-C Druguet DE Zeitoun |
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Institution: | Laboratoire I.U.S.T.I. - U.M.R. C.N.R.S. 6595, Département Milieux Hors d'Equilibre, Université de Provence, Technop?le de Chateau Gombert, 5, rue Enrico Fermi, 13453 Marseille Cedex 13, France, FR
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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 and 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 vibration coupling on the first Zeldovich reaction, and the absence of vibration coupling effects on the second Zeldovich reaction.
Received 30 June 1997 / Accepted 3 December 1997 |
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Keywords: | :Hypersonic flow Shock wave Chemical and vibrational non-equilibrium Coupling vibration-exchange reaction NO radiation intensity |
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