Homogeneous Charge Compression Ignition combustion and fuel composition

Homogeneous charge compression ignition, HCCI, combustion has potentials to deliver high efficiency and negligible cycle-to-cycle variations, while keeps NOx and particulate emissions at very low levels in comparison with conventional SI and CI combustion concepts. Since HCCI combustion is an auto ignited combustion, fuel structure has direct impact on its auto-ignition performance. In this research, by mixing iso-octane and n-heptane, the auto-ignition nature of fuels with different research octane number, RON, were simulated and analysed using a single-zone engine combustion model with detailed chemical kinetics and convective heat transfer loss. The effects of internally recirculated engine exhaust gas, IEGR, as a potential control strategy was also calculated.