Effects of Injection Timing and EGR on DI Diesel Engine Performance and Emission-using CFD

The aim of present study was to investigate the effect of early iection and EGR on engine performance and emission. This entire computational study was modelled by using the commercial CFD code - STAR-CD. Using this code, the timing of early iection and EGR fraction was varied to investigate their effect on pollutant emissions. The iection timing and EGR fraction was also optimised for better engine performance and Emissiom. Due to stringent emissionnorms, there is an immediate need to address the issue of emission control from automobile exhaust and related technologies. NOx and PM are the major pollutants from Diesel engine exhaust. The fuel irjection system is the heart of the desel engine and with the advance of electronically controlled fuel iection, multiple irjection, High iection pressure, retarded irjection timing, EGR and hgh swirl ratio have all been used to improve performance and reduce emissiom. Combustion of fuel can also be optimised leading to leaner operation and lesser emissions. Each technology has its own merits and demerits and there exists strong interaction between these methods when they are simultaneously employed. © 2010 Asian Network for Scientific Information.