Nonequilibrium vibrational distributions of N2 in the boundary layer surrounding a blunt body in hypersonic flow have been calculated by coupling the nonequilibrium vibrational kinetics, the dissociation and recombination processes, and the boundary-layer equations. The role of different energy exchange processes [vibration-vibration (V-V), vibration-translation (V-T), and recombination-dissociation] in affecting vibrational kinetics has been studied by considering each process. Then the complete kinetics are taken into account, obtaining a global view of the interplay of the different microscopic processes. The model used for the recombination/dissociation processes is such to selectively pump levels v = 25 and 45 of the N2 vibrational manifold. This vibrational energy is then redistributed by V-V and V-T processes. As a result, strongly nonequilibrium vibrational distributions are obtained, despite the thermalizing action of the V-T processes by nitrogen atoms.
Nonequilibrium Vibrational Kinetics in the Boundary Layer of Re-Entering Bodies
GColonna;
1996
Abstract
Nonequilibrium vibrational distributions of N2 in the boundary layer surrounding a blunt body in hypersonic flow have been calculated by coupling the nonequilibrium vibrational kinetics, the dissociation and recombination processes, and the boundary-layer equations. The role of different energy exchange processes [vibration-vibration (V-V), vibration-translation (V-T), and recombination-dissociation] in affecting vibrational kinetics has been studied by considering each process. Then the complete kinetics are taken into account, obtaining a global view of the interplay of the different microscopic processes. The model used for the recombination/dissociation processes is such to selectively pump levels v = 25 and 45 of the N2 vibrational manifold. This vibrational energy is then redistributed by V-V and V-T processes. As a result, strongly nonequilibrium vibrational distributions are obtained, despite the thermalizing action of the V-T processes by nitrogen atoms.File | Dimensione | Formato | |
---|---|---|---|
prod_261744-doc_71618.pdf
solo utenti autorizzati
Descrizione: AIAA-803-900_JTHTvol10_1996.pdf
Dimensione
1.38 MB
Formato
Adobe PDF
|
1.38 MB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.