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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.142 SNIP: 0.16 CiteScore™: 0.29

ISSN Print: 2150-766X
ISSN Online: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.600
pages 576-586

FLAME STRUCTURE OF HYDRAZINIUM NITROFORMATE

Valery P. Sinditskii
Department of Chemical Engineering, Mendeleev University of Chemical Technology, Moscow, 125047, Russia
Valery V. Serushkin
Department of Chemical Engineering, Mendeleev University of Chemical Technology, Moscow, 125047, Russia
Sergey A. Filatov
Department of Chemical Engineering, Mendeleev University of Chemical Technology, Moscow, 125047, Russia
Viacheslav Yu. Egorshev
Department of Chemical Engineering, Mendeleev University of Chemical Technology, 9 Miusskaya Sq., 125047, Moscow, Russia

ABSTRACT

Flame structure of hydrazinium nitroformate (HNF) has been investigated by fine tungsten-rhenium thermocouples. The occurrence of an exothermic chemical reaction in condensed phase of HNF has been observed and attributed to reaction of N2H4 with decomposition products of nitroform anion yielded ammonium nitioformate (ANF) along with H2O, N2O and N2. The mechanism of the chemical processes that can result in these products has been proposed. Calculation of the heat balance at the boundary of condensed and gaseous phases has shown that the condensed phase heat release is quite considerable at low pressures. Analyzing of surface temperature data has allowed the assumption that the surface temperature of HNF is controlled by dissociation of the salt. Two distinct flames were observed above the burning surface of HNF in the temperature profiles at low pressures. Based on possible pathways of the nitroform decomposition, a suggestion has been made that decomposition of nitroform and oxidation of N2H4, NH3 and carbon-containing products (supposedly, nitrile N-oxide, CNO, or its isomer isocyanate, NCO radicals) take place in the first flame zone. Temperature in the second flame zone rises due to the exothermic decomposition of N2O and NO.


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