Journal
APPLIED ENERGY
Volume 226, Issue -, Pages 1169-1186Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2018.05.078
Keywords
Soot; Duct; Diesel; Spray; Mixing; Combustion
Categories
Funding
- U.S. Department of Energy Office of Energy Efficiency and Renewable Energy, Bioenergy Technologies, and Vehicle Technologies Offices
- U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists under the Science Undergraduate Laboratory Internships Program
- U.S. Department of Energy [DE NA-0003525]
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Ducted fuel injection is a strategy that can be used to enhance the fuel/charge-gas mixing within the combustion chamber of a direct-injection compression-ignition engine. The concept involves injecting the fuel through a small tube within the combustion chamber to make the most fuel-rich regions of the micture in the autoignition zone leaner relative to a conventional free-spray configuration (i.e., a fuel spray that is not surrounded by a duct). This study is a follow-on to initial proof-of-concept experiments that also were conducted in a constant volume combustion vessel. While the initial natural luminosity imaging experiments demonstrated that ducted fuel injection lowers soot incandescence dramatically, this study adds a more quantitative diffuse back-illumination diagnostic to measure soot mass, as well as investigates the effects on performance of varying duct geometry (axial gap, length, diameter, and inlet and outlet shapes), ambient density, and charge-gas dilution level. The result is that ducted fuel injection is further proven to be effective at lowering soot by 35-100% across a wide range of operating conditions and geometries, and guidance is offered on geometric parameters that are most important for improving performance and facilitating packaging for engine applications.
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