Dilution sensitivity of particulate matter emissions from reactivity controlled compression ignition combustion

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Dual-fuel reactivity-controlled compression ignition (RCCI) combustion can yield high thermal efficiency and simultaneously low NOX and soot emissions. Although soot emissions from RCCI is very low, hydrocarbon emissions are high, potentially resulting in higher than desired total particulate matter (PM) mass and number caused by semivolatile species converting the particle phase upon primary dilution in the exhaust plume. Such high organic fraction PM is known to be highly sensitive to the dilution conditions used when collecting samples on a filter or when measuring particle number using particle sizing instruments. In this study, PM emissions from a modified single-cylinder diesel engine operating in RCCI and conventional diesel combustion modes were investigated under different dilution conditions. To investigate the effect of the fumigated fuel on the PM emissions, 150 proof hydrous ethanol and gasoline were used as low reactivity fuels to study the relative contribution of fumigant versus directly injected fuel on the PM emissions. Our study found that PM from RCCI combustion is more sensitive to the variation of dilution conditions than PM from single fuel conventional diesel combustion. RCCI PM primarily consisted of semi-volatile organic compounds and a smaller amount of solid carbonaceous particles. The fumigated fuel had a significant effect on the PM emissions characteristics for RCCI combustion. Hydrous ethanol fueled RCCI PM contained a larger fraction of volatile materials and were more sensitive to the variation of dilution conditions compared to the gasoline fueled RCCI mode.

Original languageEnglish (US)
Title of host publicationLarge Bore Engines; Fuels; Advanced Combustion
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791857274
DOIs
StatePublished - Jan 1 2015
EventASME 2015 Internal Combustion Engine Division Fall Technical Conference, ICEF 2015 - Houston, United States
Duration: Nov 8 2015Nov 11 2015

Publication series

NameASME 2015 Internal Combustion Engine Division Fall Technical Conference, ICEF 2015
Volume1

Other

OtherASME 2015 Internal Combustion Engine Division Fall Technical Conference, ICEF 2015
CountryUnited States
CityHouston
Period11/8/1511/11/15

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