Impingement heating and ignition of condensed-phase energetic materials

A mathematical model is developed to simulate ignition of condensed-phase e nergetic materials by impingement of a hot gas jet, The hydrodynamics of th e how are considered to be steady state, while thermal transients take plac e with a step-temperature change at the jet upstream boundary condition. Co ndensed-phase chemical reactions are included in the model to account for t he thermochemical changes within the energetic material because of heat add ition at the exposed surface. The numerical method of lines is used to solv e the governing equations in the gas and condensed phases. The results show the effects of several thermophysical properties on the ignition process i ncluding the hydrodynamic characteristics of the flow, the gas-temperature at the jet exit, the physical properties of the solid materials and the imp inging gases, and the chemical kinetics of the energetic material. The curr ent investigation also provides a discussion of the validity of some common assumptions appearing in the literature including semi-infinite solid geom etry, one-dimensional modeling, steady-state treatment of the gas region, a nd the inert-heating approach.