High-temperature oxidation kinetics of iso-octane/nbutanol blends-air mixture

N-butanol/iso-octane blends chemical kinetic mechanism is established on the basis of a nbutanol reaction submodel and part of a high-temperature oxidation mechanism of iso-octane, laminar flame speeds of iso-octane/n-butanol blends are simulated and compared with the experimental data sets. It reveals that the Su increases nonlinearly with the increase of n-butanol in the blend and implies that the intermediates of n-butanol are more reactive. Then detailed kinetic path analysis of both nbutanol and iso-octane was performed to find out the rationale for the accelerating. The most influential intermediate reactions were determined for the blend, and flame propagation is largely negative related to concentration of ic4h8 c3h6 and CH₃, while C₂H₄ and C₂H₃ contribute to the promotion of laminar flame speeds. Flame structures of n-butanol blending iso-octane were also computed and correspond to the kinetic path analysis.