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Title: Using Ducted Fuel Injection to Attenuate Soot Formation in a Mixing-Controlled Compression Ignition Engine

Abstract

Ducted fuel injection (DFI) has been introduced 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), here we provide 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 NO x with increasing dilution.

Authors:
 [1];  [1];  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1529141
Report Number(s):
SAND-2019-1518J
Journal ID: ISSN 1946-3944; 672499
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
SAE International Journal of Engines (Online)
Additional Journal Information:
Journal Name: SAE International Journal of Engines (Online); Journal Volume: 12; Journal Issue: 3; Journal ID: ISSN 1946-3944
Publisher:
SAE International
Country of Publication:
United States
Language:
English
Subject:
Ducted fuel injection; Diesel; Soot

Citation Formats

Nilsen, Christopher W., Biles, Drummond E., and Mueller, Charles J. Using Ducted Fuel Injection to Attenuate Soot Formation in a Mixing-Controlled Compression Ignition Engine. United States: N. p., 2019. Web. doi:10.4271/03-12-03-0021.
Nilsen, Christopher W., Biles, Drummond E., & Mueller, Charles J. Using Ducted Fuel Injection to Attenuate Soot Formation in a Mixing-Controlled Compression Ignition Engine. United States. doi:10.4271/03-12-03-0021.
Nilsen, Christopher W., Biles, Drummond E., and Mueller, Charles J. Fri . "Using Ducted Fuel Injection to Attenuate Soot Formation in a Mixing-Controlled Compression Ignition Engine". United States. doi:10.4271/03-12-03-0021. https://www.osti.gov/servlets/purl/1529141.
@article{osti_1529141,
title = {Using Ducted Fuel Injection to Attenuate Soot Formation in a Mixing-Controlled Compression Ignition Engine},
author = {Nilsen, Christopher W. and Biles, Drummond E. and Mueller, Charles J.},
abstractNote = {Ducted fuel injection (DFI) has been introduced 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), here we provide 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.},
doi = {10.4271/03-12-03-0021},
journal = {SAE International Journal of Engines (Online)},
number = 3,
volume = 12,
place = {United States},
year = {2019},
month = {5}
}

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