Light-Duty Reactivity Controlled Compression Ignition Combustion Using a Cetane Improver University of Wisconsin Madison

Format:

Conference/Event

Author/Creator:

Kaddatz, Kaddatz, author.

Contributor:

Andrie, Michael

Kokjohn, Sage

Reitz, Rolf D.

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

Premixed compression ignition (PCI) strategies offer thepotential for simultaneously low NOx and soot emissionsand diesel-like efficiency. However, these strategies are generallyconfined to low loads due to difficulties controlling thecombustion phasing and heat release rate. Recent experiments havedemonstrated that dual-fuel reactivity-controlled compressionignition (RCCI) combustion can improve PCI combustion control andexpand the PCI load range. Previous studies have explored RCCIoperation using port-fuel injection (PFI) of gasoline anddirect-injection (DI) of diesel fuel. In this study, experimentsare performed using a light-duty, single-cylinder research engineto investigate RCCI combustion using a single fuel with theaddition of a cetane improver 2-ethylhexyl nitrate (EHN). The fueldelivery strategy consists of port-fuel injection of E10 (id est, 10%ethanol in gasoline) and direct-injection of E10 mixed with 3% EHN.The results using the E10+EHN strategy are compared to anE10+diesel dual-fuel strategy.It was found that the additized E10 blend performed similar todiesel fuel and was capable of achieving controlled PCI operationover a range of conditions. In contrast to previous low-temperaturecombustion studies using EHN, the present work shows that, sincethe EHN quantity is very low (~0.3% of the total fuel), thenitrogen in the fuel only results in a small increase inNOx emissions. Although NOx emissions ofE10-EHN RCCI are slightly higher than E10-diesel RCCI,NOx levels are below 1 g/kW-hr over a range of loads.Similar to previous light-duty dual-fuel RCCI operation, thesingle-fuel E10-EHN RCCI strategy demonstrated a peak-indicatedefficiency of near 50% at a mid-load (9 bar gross IMEP) operatingcondition

Notes:

Vendor supplied data

Publisher Number:

2012-01-1110

Access Restriction:

Restricted for use by site license