Numerical Simulation Of HCCI Combustion With High RON Fuel Using Parallel Computation And Reduced Mechanisms

Homogeneous Charge Compression Ignition (HCCI) is an important improvement for the combustion technique, and it has great potential in energy saving and emission reducing of the internal combustion engine. In recent years, the study related to the HCCI combustion has expanded from theory to numerical simulation and experimental research. As is known to us, the self-ignition is dominated by the chemical kinetics, so the study of the chemical kinetics mechanism becomes more detailed.A reduced chemical kinetic mechanism for the oxidation of primary reference fuel (PRF) was used to model internal combustion engines. Firstly, sensitivity analysis was made to optimize reaction rate constants of selected reactions; then the chemical kinetic mechanism was implemented into the three-dimensional CFD code to study the combustion process in HCCI engines, and compared to the experiment. The simulation results showed a good agreement with the experiments.Based on that, the HCCI combustion characteristics were studied under different inlet temperature, wall temperatures, inlet pressure, engine speeds, compression ratios, equivalence ratios as well as EGRs. 3D simulation results were also used to analyze the flow field, temperature and species concentration distribution.The results provide a detailed insight into the processes governing combustion, and are of profound theoretical significance and utility value.