Reaction Model and Heat Release for Low-Temperature Ignition of Isobutanol

Abstract

This research presents the study of heat release in the iso-butanol ignition process at temperatures T < 900 K, applying low-temperature chemistry and starting from a proposed kinetic scheme of 12 elementary reaction stages. A numerical analysis of the thermal energy release available for ignition is developed, where the formation of aldehydes is important in this combustion phenomenon. The low temperature kinetics for this alcohol were found to be unable to maintain the reactivity of the system. The OHs generated by low temperature chemistry react mainly to produce iso-butanal aldehyde instead of consuming the main fuel which inhibits NTC (Negative Temperature Coefficient) behaviour. To maintain the reactivity of the system, the reaction pathways of hydrogen peroxide H2O2 (HO2→H2O2→OH) are added, obtaining a short kinetic mechanism of 14 reactions that generates a good fit for the experimental developments of ignition time at lower temperatures. of 1000 K.