TY - JOUR
T1 - CFD investigation into diesel fuel injection schemes with aid of Homogeneity Factor
AU - Mobasheri, R.
AU - Peng, Z.J.
PY - 2013/4/1
Y1 - 2013/4/1
N2 - A modified parameter named " Homogeneity Factor (HF) of in-cylinder charge" has been introduced as a new measure for supporting the understanding of the air-fuel mixing and combustion process in diesel engines. The effects of this parameter on engine performance and pollutant emissions have been studied using various EGR and split injection schemes on a DI diesel engine. In this study, twelve different injection strategies for which two injection pulses with different fuel amount for each pulse (up to 30% for the second pulse) and different separation between two pulses (up to 30° CA) were evaluated using CFD modeling. Results show the higher Homogeneity Factor will result in higher rate of air-fuel mixing and more complete combustion process. It was found when the dwell delay between injection pulses becomes longer, as it leaves more time for the air-fuel mixing during the late compression stroke, the maximum amount of Homogeneity Factor will be obtained at a later stage of combustion process and it can caused a reduction of NOx formation. This suggests, by optimizing split injection configurations accompanied with appropriate EGR rate, pollutant emissions can be decreased and controlled more accurately.
AB - A modified parameter named " Homogeneity Factor (HF) of in-cylinder charge" has been introduced as a new measure for supporting the understanding of the air-fuel mixing and combustion process in diesel engines. The effects of this parameter on engine performance and pollutant emissions have been studied using various EGR and split injection schemes on a DI diesel engine. In this study, twelve different injection strategies for which two injection pulses with different fuel amount for each pulse (up to 30% for the second pulse) and different separation between two pulses (up to 30° CA) were evaluated using CFD modeling. Results show the higher Homogeneity Factor will result in higher rate of air-fuel mixing and more complete combustion process. It was found when the dwell delay between injection pulses becomes longer, as it leaves more time for the air-fuel mixing during the late compression stroke, the maximum amount of Homogeneity Factor will be obtained at a later stage of combustion process and it can caused a reduction of NOx formation. This suggests, by optimizing split injection configurations accompanied with appropriate EGR rate, pollutant emissions can be decreased and controlled more accurately.
UR - http://www.scopus.com/inward/record.url?scp=84875617478&partnerID=8YFLogxK
U2 - 10.1016/j.compfluid.2013.02.013
DO - 10.1016/j.compfluid.2013.02.013
M3 - Article
AN - SCOPUS:84875617478
SN - 0045-7930
VL - 77
SP - 12
EP - 23
JO - Computers and Fluids
JF - Computers and Fluids
ER -