Fuel reactivity controlled compression ignition (RCCI): a pathway to controlled high-efficiency clean combustion

A fuel reactivity controlled compression ignition (RCCI) concept is demonstrated as a promising method to achieve high efficiency – clean combustion. Engine experiments were performed in a heavy-duty test engine over a range of loads. Additionally, RCCI engine experiments were compared to convention...

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Bibliographic Details
Published in:International journal of engine research 2011-06, Vol.12 (3), p.209-226
Main Authors: Kokjohn, S L, Hanson, R M, Splitter, D A, Reitz, R D
Format: Article
Language:English
Subjects:
Cleaning
Combustion
Comparative analysis
Compressing
Diesel engines
Engines
Fluid dynamics
Fuels
Heat transfer
Ignition
Reduction
Simulation
Soot
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Summary:A fuel reactivity controlled compression ignition (RCCI) concept is demonstrated as a promising method to achieve high efficiency – clean combustion. Engine experiments were performed in a heavy-duty test engine over a range of loads. Additionally, RCCI engine experiments were compared to conventional diesel engine experiments. Detailed computational fluid dynamics modelling was then used to explain the experimentally observed trends. Specifically, it was found that RCCI combustion is capable of operating over a wide range of engine loads with near zero levels of NOx and soot, acceptable pressure rise rate and ringing intensity, and very high indicated efficiency. For example, a peak gross indicated efficiency of 56 per cent was observed at 9.3 bar indicated mean effective pressure and 1300 rev/min. The comparison between RCCI and conventional diesel showed a reduction in NOx by three orders of magnitude, a reduction in soot by a factor of six, and an increase in gross indicated efficiency of 16.4 per cent (i.e. 7.9 per cent more of the fuel energy was converted to useful work). The simulation results showed that the improvement in fuel conversion efficiency was due both to reductions in heat transfer losses and improved control over the start- and end-of-combustion.
ISSN:1468-0874
2041-3149
DOI:10.1177/1468087411401548