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Effect of two-stage injection on unburned hydrocarbon and carbon monoxide emissions in smokeless low-temperature diesel combustion with ultra-high exhaust gas recirculation

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Title: Effect of two-stage injection on unburned hydrocarbon and carbon monoxide emissions in smokeless low-temperature diesel combustion with ultra-high exhaust gas recirculation
Authors: Li, Tie Browse this author
Suzuki, Masaru Browse this author
Ogawa, Hideyuki Browse this author
Keywords: Diesel Engine
Low Temperature Combustion (LTC)
Exhaust Gas Recirculation (EGR)
Two-Stage Injection
Unburned Hydrocarbon
Carbon Monoxide
Issue Date: 1-Oct-2010
Publisher: Sage Publications
Journal Title: International Journal of Engine Research
Volume: 11
Issue: 5
Start Page: 345
End Page: 354
Publisher DOI: 10.1243/14680874JER585
Abstract: The unburned hydrocarbon (UHC) and carbon monoxide (CO) emissions from smokeless low temperature diesel combustion (LTC) with ultra-high exhaust gas recirculation (EGR) can be attributed to lowered combustion temperatures as well as to under-mixing of fuel-rich mixture along the combustion chamber walls, overly-mixed fuel-lean mixture at the spray tails, and fuel missing the piston bowl and entering the squish zones. Two-stage injection has the potential to reduce UHC and CO emissions through decreasing the ratios of these mixtures. This study investigates the effects of two-stage fuel injection by varying the dwell between the two injections as well as the fuel quantity in each injection on the UHC and CO emissions, experimentally with a single cylinder diesel engine. With the optimized dwell and injection ratio, two-stage injection can reduce the UHC and CO emissions, but these emissions are still at high levels in the ultra-high EGR smokeless LTC regime. Computational fluid dynamics simulations of the in-cylinder spray and mixture formation processes showed that with the two-stage injection, over-rich mixture in the squish zones can be significantly avoided but the over-lean mixtures at center of the combustion chamber are little reduced, and these would likely be a significant source of UHC and CO emissions.
Rights: The final, definitive version of this paper has been published in International Journal of Engine Research, 11(5), Oct. 2010 by SAGE Publications Ltd, All rights reserved. © Institution of Mechanical Engineers
Type: article (author version)
URI: http://hdl.handle.net/2115/47389
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 李 鉄

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