Ducted Fuel Injection versus Conventional Diesel Combustion: An Operating-Parameter Sensitivity Study Conducted in an Optical Engine with a Four-Orifice Fuel Injector
Journal Article
03-13-03-0023
ISSN: 1946-3936, e-ISSN: 1946-3944
Sector:
Topic:
Citation:
Nilsen, C., Biles, D., Yraguen, B., and Mueller, C., "Ducted Fuel Injection versus Conventional Diesel Combustion: An Operating-Parameter Sensitivity Study Conducted in an Optical Engine with a Four-Orifice Fuel Injector," SAE Int. J. Engines 13(3):345-362, 2020, https://doi.org/10.4271/03-13-03-0023.
Language:
English
Abstract:
Ducted fuel injection (DFI) has been shown to attenuate engine-out soot emissions
from diesel engines. The concept is to inject fuel through a small tube within
the combustion chamber to enable lower equivalence ratios at the autoignition
zone, relative to conventional diesel combustion. Previous experiments have
demonstrated that DFI enables significant soot attenuation relative to
conventional diesel combustion for a small set of operating conditions at
relatively low engine loads. This is the first study to compare DFI to
conventional diesel combustion over a wide range of operating conditions and at
higher loads (up to 8.5 bar gross indicated mean effective pressure) with a
four-orifice fuel injector. This study compares DFI to conventional diesel
combustion through sweeps of intake-oxygen mole fraction (XO2),
injection duration, intake pressure, start of combustion (SOC) timing,
fuel-injection pressure, and intake temperature. DFI is shown to curtail
engine-out soot emissions at all tested conditions. Under certain conditions,
DFI can attenuate engine-out soot by over a factor of 100. In addition to
producing significantly lower engine-out soot emissions, DFI enables the engine
to be operated at low-NOx conditions that are not feasible with
conventional diesel combustion due to high soot emissions.