Premixed Combustion Model of SI Engine With Considering Burnt Gas Composition

Conventional combustion models are suitable for predicting flame propagation for a wrinkled flamelet configuration. But they cannot predict the burnt gas composition. This causes the overestimation of burnt gas temperature and pressure. A modified method of combustion simulation was established to calculate the chemical composition and to investigate their ultimate fate in the burnt gas region. In this work, the secondary products of combustion process, like CO and H₂, were considered as important factors. A three-dimensional CFD program was used to simulate the turbulent combustion and a zero dimensional equilibrium code was used to predict the chemical composition of burnt gas. With this simple connection of zero and three dimensional calculation, more reasonable temperature and pressure values approaching the experimental result were predicted without additional time costs.