Detailed Simulation of Nitrogen Dissociation in Stagnation Regions
by
Candler, G.V., J. Olejniczak, and B. Harrold
in
Physics of Fluids, Vol. 9, No. 7, pp. 2108-2117, July, 1997.
Category: Journal Article
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Abstract:
Vibrational relaxation rates from Schwartz–Slawsky–Herzfeld theory and the forced-harmonic oscillator model are used to study the flow of nitrogen in the stagnation region of a blunt body. The mass conservation equations are coupled to the momentum and total energy equations, and solved using an implicit finite-volume computational fluid dynamics method. The effects of single- and multiple-quantum vibration–translation transitions and vibration–vibration transitions are studied. Also, the effect of the mass diffusion of the excited oscillators across the shock layer is investigated. It is found that highly non-Boltzmann vibrational distributions are present in the flow field, and that the forced-harmonic oscillator model predicts that dissociation occurs from the low vibrational levels only.
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