Ignition delays of two ADN/GAP mixtures irradiated by a CO2 laser: atmospheric experiments and numerical calculations

Abstract

Abstract The ignition experiments of two ADN/GAP mixtures irradiated by a CO2 laser were conducted to investigate the dominant mechanism of ignition induced process. The power law exponents of experimental curves for ignition delay versus laser power density are all closed to -1. Two reduced numerical models were employed to calculate the ignition delay times against the experimental data. The analysis suggested that the ignition delays of ADN/GAP mixtures related to the corresponding burning rates and the ignition delay behaviours followed a fixed energy pattern approximately. The calculation results indicated that the measured ignition delay time might be mainly dominated by the formation of preheating layer for steady state burning.