Authors: Nguyễn, Lê Duy Khải.; Advisor: Huh, Kangyul; Hwang, Youngkyu; Kim, Hongsuk; Kwon, Ohchae; Sung, Nakwon (2009)The effects of split injection, oxygen enriched air, and heavy exhaust gas recirculation (EGR) on soot emissions in a direct injection diesel engine are studied using the KIVA-3V code.
When split injection is applied, a dwell time between two injections causes the decrease in local temperature and the fuel-rich area in the flame, which leads to the significantly decrease in precursor formation. Thus, the soot formation in split injection is decreased compared to single injection. The second injection of fuel into a cylinder results in two separate stoichiometric zones which help increase soot oxidation. As a result of soot formation decrease and soot oxidation increase, the soot emissions are decreased.
When oxygen enriched air is applied together with split injection, a...