Thermochemistry and Kinetics Models for Magnesium/Teflon/Viton Pyrotechnic Compositions

摘要

This study examines in detail the equilibrium chemistry of Magnesium/ Teflon (MT), Magnesium/Teflon/Viton (MTV), and MTV-air compositions. Gas-phase as well as solid-phase chemistry has been included. Equilibrium calculations accounting for over 47 species and various initial conditions have been performed. A comparison between MT and MTV combustion has been carried out with emphasis on investigating the effect of Viton on the combustion characteristics. The effect of air on MTV combustion has also been investigated for two possible MTV-air combustion models. A chemical kinetic mechanism with 18 reactions and 17 species, has been used to study the time evolution of reacting MT mixtures, accounting for finite-rate elementary reactions as well as performing sensitivity analysis with respect to reaction rates. Three different variations of the kinetic scheme have been studied and their effects on combustion products and flame temperature have been examined. Kinetic analysis has been repeated for three pyrotechnic compositions that are commonly used in flare and rocket motor igniter formulations.