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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.28 SNIP: 0.421 CiteScore™: 0.9

ISSN Imprimir: 2150-766X
ISSN En Línea: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2012001410
pages 107-122

MODELING OF SELF-IGNITION, STRUCTURE, AND VELOCITY OF PROPAGATION OF THE FLAME OF HYDROGEN AZIDE

Oleg P. Korobeinichev
Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch of the Russian Academy of Sciences, Institutskaya St. 3, Novosibirsk, 630090 Novosibirsk region, Russia
Alexander A. Paletsky
Institute of Chemical Kinetics and Combustion, Siberian Branch Russian Academy of Sciences, 630090 Novosibirsk, Russia
N. V. Budachov
Institute of Chemical Kinetics and Combustion Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Tatyana A. Bolshova
Institute of Chemical Kinetics and Combustion, Siberian Branch Russian Academy of Sciences, 630090 Novosibirsk, Russia
Vadim D. Knyazev
Department of Chemistry, The Catholic University of America, Washington, DC 20064, USA

SINOPSIS

A kinetic mechanism of thermal decomposition of hydrogen azide (HN3) has been developed. The mechanism adequately describes experimental data on the self-ignition of HN3 and propagation velocity of HN3 flames available in the literature. The mechanism includes 60 reactions with 15 participating species (He, H2, H, N, NH, NH2, NNH, NH3, HN3, N3, N2, Ar, N2H2, N2H3, and N2H4). For the total pressure of 50 Torr of mixtures of HN3 with different diluents (N2, Ar, and He), self-ignition limits of HN3 and flame speeds were calculated using the developed mechanism. The results of modeling of the flame structure of the HN3/N2 and the HN3/Ar mixtures demonstrated that, with the HN3 concentration in the 50−100% range, the maximum temperatures in the flame front exceed thermodynamic equilibrium values by 140−610 K; i.e., super-adiabatic flame temperatures are reached. The developed mechanism can be used for modeling combustion and thermal decomposition in chemical systems containing hydrogen azide.


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