期刊
SAE INTERNATIONAL JOURNAL OF ENGINES
卷 12, 期 3, 页码 309-322出版社
SAE INT
DOI: 10.4271/03-12-03-0021
关键词
Ducted fuel injection; Diesel; Soot
资金
- US Department of Energy, Office of Energy Efficiency and Renewable Energy, Bioenergy Technologies and Vehicle Technologies Offices
- US Department of Energy's National Nuclear Security Administration [DE-NA-0003525]
Ducted fuel injection (DFI) has been proposed as a strategy to enhance the fuel/charge gas mixing within the combustion chamber of a direct-injection mixing-controlled compression ignition engine. The concept involves injecting each fuel spray through a small tube within the combustion chamber to facilitate the creation of a leaner mixture in the autoignition zone, relative to a conventional free-spray configuration (i.e., a fuel spray that is not surrounded by a duct). While previous experiments demonstrated that DFI lowers both soot incandescence and soot mass in a constant-volume combustion vessel with a single-component normal-alkane fuel (n-dodecane), this study provides the first evidence that the technology provides similar benefits in an engine application using a commercial diesel fuel containing similar to 30 wt% aromatics. The present study investigates the effects on engine-out emissions and efficiency with a two-orifice injector tip for charge gas mixtures containing 16 and 21 mol% oxygen. The result is that DFI is confirmed to be effective at curtailing engine-out soot emissions. It also breaks the tradeoff between emissions of soot and nitrogen oxides (NOx) by simultaneously attenuating soot and NOx with increasing dilution.
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