two-stage ignition; Rapid Compression Machine (RCM); Jet-A/oxidizer and JP-8/oxidizer mixtures; oxidizer-to-fuel mass ratio; effect of varying fuel loading at a fixed oxygen mole fraction; effect of varying oxygen mole percentage at a fixed fuel loading; effects of varying fuel loading at a fixed equivalence ratio; results for argon diluted Jet-A/air mixtures; ignition delay correlations for Jet-A/oxidizer mixtures