Using Ducted Fuel Injection to Attenuate Soot Formation in a Mixing-Controlled Compression Ignition Engine
Journal Article
03-12-03-0021
ISSN: 1946-3936, e-ISSN: 1946-3944
Sector:
Topic:
Citation:
Nilsen, C., Biles, D., and Mueller, C., "Using Ducted Fuel Injection to Attenuate Soot Formation in a Mixing-Controlled Compression Ignition Engine," SAE Int. J. Engines 12(3):309-322, 2019, https://doi.org/10.4271/03-12-03-0021.
Language:
English
Abstract:
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 ~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.