Study of HCCI Combustion Characteristics with High RON Fuel

A comprehensive chemical kinetics mechanism (89 species,413 reactions) for hydrocarbon fuels with high RON was constructed to simulate the auto-ignition process under the Homogeneous Charge Compression Ignition (HCCI) conditions.The reaction mechanism was validated by using the experimental datas from a Rapid Compression Machine.The simulated results showed a good agreement with the measurements.The ignition delay and the burning rate could be captured accurately by the simulation.The mechanism was implemented into the numerical simulation of HCCI combustion in gasoline engines combined with CHEMKIN code.The HCCI combustion characteristics were studied under different inlet temperature,inlet pressures,A/F ratios,compression ratios,engine speeds as well as EGRs.Meanwhile,the concentration variations of reactants,the major products and the radicals versus crank angle were calculated.The research results provided guidance for the optimization of HCCI combustion process.