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Consistent multi-internal-temperatures models for nonequilibrium nozzle flows

Abstract : A vibrational collisional model based on the database of the University of Bari is used to investigate non- equilibrium phenomena in nitrogen nozzle flows. For the cases studied, the vibrational distribution in the divergent section appeared to significantly deviate from a Boltzmann distribution. Multiquanta Vibra- tion-Translation processes are shown to have a major influence on the recombination of the flow and on the shape of the vibrational distribution along the nozzle axis. Based on these results, a reduced model is derived with n groups of vibrational levels with their own internal temperatures to model the shape of the vibrational distribution. In this model, energy and chemistry source terms are calculated self-consis- tently from the rate coefficients of the vibrational database. For the studied nozzle flows, a good agree- ment is observed between the results of the vibrational collisional model with 68 levels and those of the reduced model with only 3 groups of levels.
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https://hal.archives-ouvertes.fr/hal-00847788
Contributor : Anne Bourdon <>
Submitted on : Wednesday, July 24, 2013 - 2:03:50 PM
Last modification on : Friday, August 14, 2020 - 9:54:04 AM

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Aurélien Guy, Anne Bourdon, Marie-Yvonne Perrin. Consistent multi-internal-temperatures models for nonequilibrium nozzle flows. Chemical Physics, Elsevier, 2013, 420 (11), pp.15-24. ⟨10.1016/j.chemphys.2013.04.018⟩. ⟨hal-00847788⟩

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