Effect of cetane coupled injection parameters on diesel engine combustion and emissions

• Published in: Fuel (Guildford) Vol. 319; p. 123714
• Main Authors: Wu, Heng, Xie, Fangxi, Han, Yongqiang, Zhang, Qiaosheng, Li, Yinlong
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.07.2022; Elsevier BV
• Subjects: Brakes; Carbon monoxide; Cetane number; Combustion; Coupling; Delay time; Diesel; Diesel engines; Emissions; Engine cylinders; Fuel consumption; Fuel injection parameters; Heat; Heat release rate; Heat transfer; Injection; Nitrogen oxides; Parameters; Particulate emissions; Particulate matter; PM concentration; Pressure; Thermodynamic efficiency; Combustion; CN; Fuel injection parameters; PM concentration; Emissions
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2022.123714

•Effect of different cetane coupled injection parameters on diesel engine combustion and emissions.•For pre-injected heat release fuels, ignition delay time and combustion duration were redefined.•Higher CN and increased injection pressure result in reduce CO and HC emissions, increase NOx emissions, and reduce particulate number concentration and total mass.•Higher CN and delayed injection timing, CO and HC emissions decrease, NOx emissions increase, PM number concentration and total mass decrease. Experiments on the effects of different cetane coupled injection parameters on diesel engine combustion and emissions were conducted on a supercharged 4-cylinder direct injection diesel engine. The results showed that with the increase of cetane number (CN), the peak in-cylinder pressure and heat release rate of fuel decrease, the coupling injection pressure increase, CO and HC emissions decrease, NOx emissions increase, the number concentration and total mass of particulate matter (PM) decrease. As the CN increases, the peak in-cylinder pressure decreases, the coupling injection timing is delayed, the peak heat release rate increases, brake thermal efficiency (BTE) decrease, brake specific fuel consumption (BSFC) increases, CO and HC emissions increase, NOx emissions decrease, and the number concentration and total mass of PM increases. Fuel characteristics and injection timing significantly influence ignition delay time and combustion duration, where CN = 53.9 fuel has no pre-injection to release heat at different injection timing, which has a more substantial impact on in-cylinder pressure and heat release rate.