Dilution effects on partially-premixed combustion of an ultra-low sulphur diesel fuel under low-load operation

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DOIResolve DOI: http://doi.org/10.1115/ICES2012-81236
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TypeArticle
Proceedings titleProceedings of the Spring Technical Conference of the ASME Internal Combustion Engine Division
ConferenceASME 2012 Internal Combustion Engine Division Spring Technical Conference, ICES 2012, 6 May 2012 through 9 May 2012, Torino, Piemonte
ISSN1529-6598
ISBN9780791844663
Pages405414; # of pages: 10
SubjectCharge dilution; Combustion duration; Combustion performance; Exhaust gas recirculation (EGR); Heavy-duty diesel engine; Oxygen concentrations; Partially-premixed; Start of injections; Combustion; Diesel engines; Diesel fuels; Fuel injection; Optimization; Oxygen; Sulfur; Dilution
AbstractDilution of partially-premixed combustion (PPC) using different combinations of excess air (λ>1) and exhaust gas recirculation (EGR) was investigated in a single-cylinder, heavy-duty diesel engine equipped with common-rail fuel injection. The experiments were limited to a single fuel injection event using ultra-low sulphur diesel fuel at a low engine load (∼3 bar BMEP) and engine speeds of 900 and 1350 rpm. The start of injection was varied to optimize the combustion performance and emissions. The experimental results show that increasing air dilution at constant EGR reduced BSFC slightly. CO and HC emissions decreased significantly due to the increased oxygen concentration, but NOx and soot emissions increased. For a given level of charge dilution, there was an optimal EGR rate to minimize BSFC. NOx emissions decreased significantly as the proportion of dilution by EGR was increased, but CO and HC emissions increased due to the reduced in-cylinder temperature and oxygen concentration, which increased the combustion duration. Copyright © 2012 by Her Majesty the Queen in Right of Canada.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology (ICPET-ITPCE)
Peer reviewedYes
NPARC number21269289
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Record identifier33261800-bbd7-4809-ad13-03dc24ae801b
Record created2013-12-12
Record modified2016-05-09
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