http://www.cnr.it/ontology/cnr/individuo/prodotto/ID302689

Reduction of State-to-State to Macroscopic Models for Hypersonics (Articolo in rivista)

Type

Label

Reduction of State-to-State to Macroscopic Models for Hypersonics (Articolo in rivista) (literal)

Anno

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

Alternative label

A. Bourdon, J. Annaloro, A. Bultel, M. Capitelli, G. Colonna, A. Guy, T.E. Magin, A. Munafó, M.Y. Perrin and L.D. Pietanza (2014)
Reduction of State-to-State to Macroscopic Models for Hypersonics
in The Open plasma physics journal
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

A. Bourdon, J. Annaloro, A. Bultel, M. Capitelli, G. Colonna, A. Guy, T.E. Magin, A. Munafó, M.Y. Perrin and L.D. Pietanza (literal)

Pagina inizio

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Rivista

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CNRS, UPR 288 \"Laboratoire d'Energétique Moléculaire et Macroscopique, Combustion\" (EM2C), Grande voie des vignes, 92295 Châtenay-Malabry, France Ecole Centrale Paris, Grande voie des vignes, 92295 Châtenay-Malabry, France CORIA, UMR CNRS 6614, Université de Rouen, BP 12, Avenue de l'Université, 76801 Saint-Etienne du Rouvray Cedex, France Dip. di Chimica, Universitá di Bari, Via Orabona, 4, 70126, Italy CNR-IMIP, sede di Bari, Via Amendola 122/D, 70126, Italy Aeronautics and Aerospace Department, von Karman Institute for Fluid Dynamics, Chaussée de Waterloo 72, 1640 Rhode-Saint-Genèse, Belgium (literal)

Titolo

Abstract

Four different types of macroscopic models developed for the vibration-chemistry coupling in nonequilibrium flows for re-entry applications are presented. First, using an approach based on nonequilibrium thermodynamics, global rate coefficients of dissociation of N2 and O2 under parent molecular or atomic impact and backward molecular recombination are determined. Then a Two-Level Distribution (TLD) model is developed, in which a relaxation equation for vibrational temperature is solved as in the case of multi-temperature models but with the simultaneous solution of a kinetic equation, as in the case of state-to-state models, but only for the last vibrational level. In a third approach, a multiinternal temperature model is presented to describe accurately the vibrational distribution function in using several groups of levels, within which the levels are assumed to follow a Boltzmann distribution at an internal temperature of the group. This multi-internal temperature model allows us to describe accurately the vibrational energy relaxation and dissociation processes behind a strong shock wave. Finally, a rovibrational collisional coarse-grain model is developed to reduce a detailed rovibrational mechanism for the internal energy excitation and dissociation processes behind a strong shock wave in a nitrogen flow. (literal)

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