Phenomenological modeling to study the combustion and emission characteristics of a spark-ignition engine

A multi-zone phenomenological model is developed based on mass and energy conservations for predicting cylinder pressure and temperature in a spark ignition (SI) engine. During the combustion process, it is assumed that cylinder charge consists of unburned and burned gas zones separated by a thin flame front. The pressure and temperature data, along with equilibrium composition of species, are then used to predict emissions. These predicted values are compared with available data obtained through experiments. A good agreement between predicted and measured cylinder pressure traces and emissions is obtained, indicating that the presented model is reliable for studying SI engine combustion and emission characteristics at different operating conditions.