An experimental and kinetic modeling study of the ignition delay and heat release characteristics of a five component gasoline surrogate and its blends with iso‐butanol within a rapid compression machine

This study investigates the performance of a five component gasoline surrogate (iso-octane, toluene, n-heptane, 1-hexene, and ethanol) in representing ignition delay time (IDT) behavior (reference PR5801—research octane number 95.4, motor 86.6), at conditions 675–870 K, 20 bar, Ф = 1 (stoichiometric) within rapid compression machine (RCM). Experimentally, produces good representation these conditions, displaying similar IDT profile. The influence blending with iso-butanol on surrogate's is also investigated, blends from 5% to 70% by volume. continues produce reasonable experimental IDTs blends, except under high degree (50% iso-butanol), where produced longer IDTs, particularly temperatures below 740 K. Blends 10% shorter than that any other blend, including “neat” surrogate, 740–770 830 respectively. Kinetic modeling RCM performed using CHEMKIN-PRO (Reaction Design: San Diego, CA, 2011) combined mechanism Sarathy et al. butanol isomers (Progress Energy Combustion Science 2014; 44: 40–102) Lawrence Livermore National Laboratories “Gasoline Surrogate” (Proceedings Institute 2011; 33(1): 193–200). model predictions K but overpredicts reactivity negative temperature coefficient region. Heat release rate analysis conducted for results investigate low-temperature heat (LTHR) behavior. Simulations largely fail accurately reproduce this analysis, local OH brute force Δhf sensitivity analyses, indicates significance LTHR determination provides rates future validation.