A numerical investigation about the EGR effect under the condition of boost pressure on HCCI autoignition

This study investigates the EGR effect under the condition of boost pressure on homogeneous charge compression ignition (HCCI) combustion engine using numerical methods. The calculation is carried out using a single-zone model included in CHEMIKN-PRO. The detailed chemical-kinetic mechanisms and thermodynamic parameters for n-heptane, iso-octane and PRF (Primary Reference Fuel) from Lawrence Livermore National Laboratory (LLNL) are used for this study. The results show that the EGR affects the heat release, the amount of heat release decrease. Hence IMEP decrease with EGR ratio increase. The EGR addition under the condition of boost pressure enhanced the autoignition reactivity, the amount of heat release increased. (C) 2015 The Authors. Published by Elsevier Ltd.