Identification of combustion regimes in diluted compression ignition conditions

This study explores the utility of classical MILD combustion definition to recognize combustion regimes under high pressures relevant for compression ignition of diesel fuels under diluted conditions. For that purpose, we employ a method recently proposed in the literature based on well-stirred reactors (WSR) with detailed chemistry to compose combustion maps using initial temperatures and oxygen mole fractions. The regime limits are designated by the transition from folded to monotonic S-shaped curves with increased dilution level. Additionally, effects of low temperature-oxidation of n-heptane are observed, leading to a cool flame regime under certain conditions