Numerical Investigation of the Effect of Cooled EGR on Turbocharger HCCI Engine Performance Fueled with Methane

In this paper the work deals with the computational analysis of early direct injected HCCI engine with turbocharger using the CHEMKIN-PRO software [1]. Since controls of combustion phenomenon and ignition timing are the main issues of these engines, the effects of cooled EGR as the controlling factors on the operating parameters such as in-cylinder temperature and pressure of HCCI engines are explored. The cooled EGR was constituted by CO2, H2O, N2, O2. The aim with the EGR was to study the differences caused by the addition of species that could enhance combustion. EGR was introduced in CHEMKIN-PRO simulations, varying it from 0% to 40%. The quantities of the components present in EGR were calculated by running a simulation in CHEMKIN-PRO with only air and fuel and analyzing the mol fractions produced of the gases in which the interest rely. Since pressure and temperature profiles plays a very important role in reaction path at certain operating conditions, an attempt had been made here to present a complete reaction path investigation on the formation/destruction of chemical species at peak temperature and pressure conditions in the first, middle and last zone.