2022 Volume 64 Issue 210 Pages 326-331
Reactivity evaluation of gasoline components were conducted using a micro flow reactor with a controlled temperature profile. Weak flame images of n-heptane/air and iso-octane/air mixtures at equivalence ratios of 0.5, 0.75 and 1.0 were taken and equivalence ratio dependence on the hot flame position was examined. Rate-of-production and sensitivity analysis identified the importance of HO2 radical formation and consumption of H2/O2 reactions. Weak flame responses to alkanes with various research octane numbers were investigated and reactivity indexes using heat release rate profiles and CH2O formation from cool flames were proposed. Effects of N2, CO2 and H2O dilutions on fuel reactivity were investigated. N2 and CO2 dilution decreased reactivity, while H2O dilution increased reactivity.