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Article Dans Une Revue Chemical Physics Année : 2012

Coarse-grain model for internal energy excitation and dissociation of molecular nitrogen

Résumé

A rovibrational collisional coarse-grain model has been developed to reduce a detailed mechanism for the internal energy excitation and dissociation processes behind a strong shockwave in a nitrogen flow. The rovibrational energy levels of the electronic ground state of the nitrogen molecule were lumped into a smaller number of bins. The reaction rate coefficients of an ab initio database developed at NASA Ames Research Center were averaged for each bin based on a uniform distribution of the energy levels within the bin. The results were obtained by coupling the Master equation for the reduced mechanism with a one-dimensional flow solver for conditions expected for reentry into Earth's atmosphere at 10 km/s. The coarse-grain collisional model developed allow us to describe accurately the internal energy relaxa- tion and dissociation processes based on a smaller number of equations, as opposed to existing reduced models assuming thermal equilibrium between the rotational and translational energy modes.

Dates et versions

hal-00695831 , version 1 (10-05-2012)

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Thierry E. Magin, Marco Panesi, Anne Bourdon, Richard L. Jaffe, David W. Schwenke. Coarse-grain model for internal energy excitation and dissociation of molecular nitrogen. Chemical Physics, 2012, 398, pp.90-95. ⟨10.1016/j.chemphys.2011.10.009⟩. ⟨hal-00695831⟩
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