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Combustion of non-catalyzed cyclotrimethylenetrinitramine-composite modified double-base propellants (Part I)
Miloš Filipović Radislav Stojanović
The decomposition and combustion wave structure of the reference double-base (DB) and non-catalyzed cyclotrimethylenetrinitramine-composite modified double-base (RDX-CMDB) propellants were studied in order to elucidate the surface and gas phase reactions, and to understand the effect of the RDX addition on the combustion characteristics of these propellants. The overall reactions of the initial decomposition on the surfaces of RDX, DB and RDX-CMDB propellants, as well as the dominating reaction following immediately the decomposition reaction, were established. The mole fractions of the reaction species on the surfaces of the energetic materials tested in this study were calculated. It has been concluded that the mole fraction of NO2, produced by the initial decomposition of RDX, is less than the one of NO2, produced by the initial decomposition of DB propellant, and that the mole fraction of NO2 decreases linearly with the increasing of the concentration of RDX. The chemical equilibrium compositions of RDX and propellants reactive mixture in the luminous zone were calculated using the stated equilibrium reaction scheme, including, firstly, the formation of chemical species the concentrations prevail of which in the mixture, then the formation of gaseous atomic species by dissociation of the previous one, and, finally, the formation of complex chemical species from the atomic species, by the iteration procedure. It has been concluded that the mole fractions of the major combustion products and other selected combustion properties vary linearly with the increasing of the concentration of RDX.
Key words: cyclotrimethylenetrinitramine-composite modified double-base propellant, flame structure, the surface and gas phase reactions, combustion products, combustion characteristics.
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