Modeling and experiments of laser-induced ignition of nitramine propellants

摘要

The objective of the work is to develop and experimentally verify a model for CO_2 laser-induced ignition of nitramine-based propellants. The one-dimensional model considers heat conduction in the condensed phase coupled to heat and mass transport with global chemical kinetics of a heterogeneous propellant in the gas-phase region. The highly nonlinear model was solved numerically. Experimentally, increases in heat flux (125 - 375 W/cm~2) lowered the ignition delay time but changes in pressure the assumption that RDX decomposition is primarily temperature controlled. These trends are correctly predicted by the model. Predictions of ignition delay time fall within the experimental uncertainty. Sensitivities of the numerical solution to the material properties and kinetic rate constants are addressed.