Shock tube measurements of jp-10 ignition

Ignition times and OH concentration time histories for JP-10/O-2/Ar mixtures have been measured behind reflected shock waves. Experiments were performed over the temperature range of 1200-1700 K, pressure range of 1-9 atm, fuel concentrations of 0.2% and 0.4%, and stoichiometries of Phi = 0.5, 1.0. and 2.0. Fuel concentrations were measured in the shock tube using laser absorption at 3.39 mum, ignition times were determined using CH emission, and OH concentration histories were inferred from narrow-linewidth cw laser absorption measurements near 306 nm. The laser measurements also revealed evidence for a long-lived JP-10 decomposition product with strong absorption near 306 nm. A kinetic model for JP-10 oxidation was developed using global decomposition reactions proposed by F. Williams in conjunction with the larger alkane mechanism of Lindstedt and Maurice. This modeling gave good agreement with the ignition times at higher pressures, and sensitivity studies using this model indicate the possible important role of C-2 chemistry in JP-10 decomposition.