Multidimensional Simulation of PCCI Combustion Using Gasoline and Dual-Fuel Direct Injection with Detailed Chemical Kinetics

Homogeneous or partially premixed charge compression ignition combustion is considered to be an attractive alternative to traditional internal combustion engine operation because of its extremely low levels of pollutant emissions. However, since it is difficult to control the start of combustion timing, direct injection of fuel into the combustion chamber is often used for combustion phasing control, as well as charge preparation. In this paper, numerical simulations of compression ignition processes using gasoline fuel directly injected using a low pressure, hollow cone injector are presented. The multi-dimensional CFD code, KIVA3V, that incorporates various advanced sub-models and is coupled with CHEMKIN for modeling detailed chemistry, was used for the study. Simulation results of the spray behavior at various injection conditions were validated with available experimental data. Then predictions of gasoline HCCI operations using detailed chemical kinetics were compared with experimental measurements for various charge equivalence ratios and injection timings. The results show good agreement with the experimental data in terms of pressure, apparent heat release profile and emissions. Further, the numerical code was modified to be able to simulate the combustion of gasoline pre-mixtures with ignition by diesel fuel direct injection and simulation results of the dual-fuel combustion are presented.