Demonstration of Single-Fuel Reactivity Controlled Compression Ignition Using Reformed Exhaust Gas Recirculation

Jeffrey T. Hwang, Seamus P. Kane, William Northrop

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations

Abstract

A key challenge for the practical introduction of dual-fuel reactivity controlled compression ignition (RCCI) combustion modes in diesel engines is the requirement to store two fuels on-board. This work demonstrates that partially reforming diesel fuel into less reactive products is a promising method to allow RCCI to be implemented with a single stored fuel. Experiments were conducted using a thermally integrated reforming reactor in a reformed exhaust gas recirculation (R-EGR) configuration to achieve RCCI combustion using a light-duty diesel engine. The engine was operated at a low engine load and two reformed fuel percentages over ranges of exhaust gas recirculation (EGR) rate and main diesel fuel injection timing. Results show that RCCI-like emissions of NOx and soot were achieved load using the R-EGR configuration. It was also shown that complete fuel conversion in the reforming reactor is not necessary to achieve sufficiently low fuel reactivity for RCCI combustion. Overall engine brake thermal efficiency (BTE) was found to be slightly lower than for conventional diesel combustion (CDC) at the same overall fueling rate; however, increasing fumigant energy fraction (FEF) was shown to improve BTE. The presented data illustrated that further system optimization could allow R-EGR-based RCCI combustion systems to achieve BTE parity with CDC operation while maintaining extremely low engine-out soot and NOX emissions.

Original languageEnglish (US)
JournalSAE Technical Papers
Volume2018-April
DOIs
StatePublished - 2018
Event2018 SAE World Congress Experience, WCX 2018 - Detroit, United States
Duration: Apr 10 2018Apr 12 2018

Bibliographical note

Funding Information:
This work was funded in part by The Minnesota Corn Growers Association (grant #1078-16EU) and the National Science Foundation (grant #1350709). The authors would like to thank our colleagues at the Thomas E. Murphy Engine Research Laboratory at the University of Minnesota.

Publisher Copyright:
© 2018 SAE International. All Rights Reserved.

Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.

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