Abstract
Chemical kinetic mechanism of compression ignition with PRF( Primary Reference Fuel ) and toluene/heptane mixture fuel (NTF) is investigated according to crank angle resolved in-cylinder sampling experiments. Profiles of two-stage consumption of fuel components in accordance with heat releases have been obtained. Formaldehyde and hydrogen peroxide were detected between cool and hot ignition stages. The increasing period between stages with increasing octane number is accounted for by the effect of decreasing heat release of cool ignition and reducing activity of H_2O_2 loop reactions with octane number. Moreover, the consumption rate decreasing with iso-octane or toluene content is accounted for by the reduction of OH reproduction index in the chain reaction mechanism and the fuels + OH reactions dominate the consumption of each fuel.
Published Version
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