Fuel property effects on PCCI combustion in a heavy-duty diesel engine

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DOIResolve DOI: http://doi.org/10.1115/1.4005213
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Journal titleJournal of Engineering for Gas Turbines and Power
Article number52801
SubjectAbsolute values; Air/fuel ratio; Brake mean effective pressures; Brake specific fuel consumption; CO emissions; Combustion duration; Combustion engines; Combustion phasing; Common rail; Distillation temperature; experimental; Experimental studies; Fuel injection systems; Fuel matrix; Fuel properties; Heavy-duty diesel engine; Ignition delays; Injection timing; matrix; PCCI combustion; Premixed charge compression ignition; Premixing; Rail pressures; Soot emissions; Top dead center; Antiknock rating; Brakes; Design; Diesel engines; Diesel fuels; Distillation; Fuel injection; Ignition; Internal combustion engines; Soot; Fuels
AbstractAn experimental study was performed to investigate fuel property effects on premixed charge compression ignition (PCCI) combustion in a heavy-duty diesel engine. A matrix of research diesel fuels designed by the Coordinating Research Council, referred to as the Fuels for Advanced Combustion Engines (FACE), was used. The fuel matrix design covers a wide range of cetane numbers (30 to 55), 90% distillation temperatures (270 to 340° C) and aromatics content (20 to 45%). The fuels were tested in a single-cylinder Caterpillar diesel engine equipped with a common-rail fuel injection system. The engine was operated at 900 rpm, a relative air/fuel ratio of 1.2 and 60% exhaust gas recirculation (EGR) for all fuels. The study was limited to a single fuel injection event starting between -30° and 0° CA after top dead center (aTDC) with a rail pressure of 150 MPa. The brake mean effective pressure (BMEP) ranged from 2.6 to 3.1 bar depending on the fuel and its injection timing. The experimental results show that cetane number was the most important fuel property affecting PCCI combustion behavior. The low cetane number fuels had better brake specific fuel consumption (BSFC) due to more optimized combustion phasing and shorter combustion duration. They also had a longer ignition delay period available for premixing, which led to near-zero soot emissions. The two fuels with high cetane number and high 90 distillation temperature produced significant soot emissions. The two fuels with high cetane number and high aromatics produced the highest brake specific NO x emissions, although the absolute values were below 0.1 g/kW-h. Brake specific HC and CO emissions were primarily a function of the combustion phasing, but the low cetane number fuels had slightly higher HC and lower CO emissions than the high cetane number fuels. © 2012 American Society of Mechanical Engineers.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology (ICPET-ITPCE)
Peer reviewedYes
NPARC number21269406
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Record identifier6c741167-82be-4b21-ae00-8375faf7868b
Record created2013-12-12
Record modified2016-05-09
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