Development of a new model for vibration-dissociation coupling in nitrogen

D. Brian Landrum, Graham V. Candler

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

A new model for vibration-dissociation coupling is derived using knowledge obtained from a simulation of the vibrational relaxation of heated nitrogen by collisional processes. This bi-Ievel model is based on the assumption that nitrogen can be represented by two molecular species. The first species, N2*, consists of vibrational excited molecules with energies within kT of the dissociation energy. Only these molecules are allowed to dissociate. The second species, N2, consists of molecules with vibrational energies less than the threshold value. This species is modeled by a truncated harmonic oscillator. The vibrational energy relaxation is represented by a modified form of the Landau-Teller equation. The effects of the bi-Ievel model on a typical hypervelocity flowfield computation are examined and compared to the Park TTV model. Specifically, it is found that the bilevel model exhibits a decreased dissociation rate. This is believed to be due to the inhibition of dissociation by nonequilibrium vibrational relaxation.

Original languageEnglish (US)
Title of host publicationAIAA 27th Thermophysics Conference, 1992
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
StatePublished - Jan 1 1992
EventAIAA 27th Thermophysics Conference, 1992 - Nashville, United States
Duration: Jul 6 1992Jul 8 1992

Other

OtherAIAA 27th Thermophysics Conference, 1992
CountryUnited States
CityNashville
Period7/6/927/8/92

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