Characterization of Continuous‐Wave Laser Heating Ignition of Ammonium Dinitramide‐Based Ionic Liquids with Carbon Fibers

Abstract

AbstractAmmonium dinitramide–based energetic ionic liquid propellants (ADN‐EILPs) exhibit the advantages of high energy density, low toxicity, and handling safety, and are therefore promising monopropellants. Herein, we characterized the ignition of ADN‐EILPs induced by CW laser heating in the presence of carbon fibers, clarifying the effect of laser power and suggesting that ignition reproducibility is influenced by the difference of ADN‐EILP osmotic state in carbon fibers or carbon fiber configuration. The observed ignition behavior allowed one to conclude that (i) high‐power CW laser heating causes the formation of bubbles on the surface, which disturbs further heating; and (ii) an Arrhenius‐type relationship exists between ignition delay and heating rate, suggesting that the strategy of foreshortening ADN‐EILP ignition delay by increasing CW laser power has certain limits.