ABSTRACT
Exhaust gas recirculation (EGR) is widely adopted to reduce the oxides of nitrogen (NOx) emission. This involves recirculation a controllable proportion of the engines exhaust back into the intake air. Present experimental study has been carried out to investigate the effect of EGR on performance and emission characteristics in a direct injection diesel. A Computational Fluid Dynamic (CFD) stimulation has been carried out in order to evaluate the effect of EGR and preliminary studies are carried out to validate the model with the experiment. For the computational analysis extended coherent flame model- 3 zone (ECFM-3Z) model of STAR-CD is considered. This model is suitable to analysis the combustion process in spark ignition (SI) and compression ignition (CI) engines. From the stimulation studies it is found that oxides of nitrogen decreases but soot increases due to lowered oxygen concentration.
