Abstract
The exhaust gas recirculation (EGR) is a widely used technology in internal combustion engines. However, its effect on combustion is the result of complex combination of many physical and chemical effects and it has not been fully broken down into the basic elements. In this study, the effects of EGR on the elemental combustion phenomena, laminar burning velocity and autoignition delay times, have been systematically investigated by numerical simulation using detailed kinetic mechanisms of combustion. Large effect was found for the laminar flame velocities while the effect of EGR on the ignition delay times was shown to be modest compared to the effect of the fuel in contrast to the small effect of fuel properties on the flame velocities. The effect of fuel reforming using exhaust gas was also discussed.
