Effect of Initial Temperature, EGR on Combustion and Performance characteristics of Homogenous Charge Compression Ignition engine fueled with Dimethyl ether

Homogeneous Charge Compression Ignition (HCCI) is a form of combustion in which pre-mixed fuel and oxidizer (typically air) are compressed to the point of auto-ignition. HCCI engines can operate with most alternative fuels, especially, dimethyl ether(DME) which has been tested as a possible diesel fuel due to its simultaneously low NOx and PM emissions. In this paper a single zone detailed chemistry combustion model for determining the time evolution of the homogenous reacting gas mixture in the combustion chamber and performance characteristics analysis has been developed. The effect of ,intake temperature and EGR on the characteristics of auto-ignition, and operating window of the HCCI combustion with considering knock and misfire boundaries, has been investigated.