Assessment of the Effect of Low Cetane Number Fuels on a Light Duty CI Engine: Preliminary Experimental Characterization in PCCI Operating Condition Technische Universiteit Eindhoven

Format:

Conference/Event

Author/Creator:

Dijkstra, Dijkstra, author.

Contributor:

Beatrice, Carlo

Bertoli, Claudio

Boot, Michael

Di Blasio, Gabriele

Conference Name:

10th International Conference on Engines & Vehicles (2011-09-11 : Naples, Italy)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

The goal of this paper is to acquire insight into the influenceof cetane number (CN) and fuel oxygen on overall engine performancein the Premixed Charge Compression Ignition (PCCI) combustionmode.From literature, it is known that low reactive (id est, low CN)fuels increase the ignition delay (ID) and therefore the degree ofmixing prior to auto-ignition. With respect to fuel oxygen, it isknown that this has a favorable impact on soot emissions by meansof carbon sequestration. This makes the use of low CN oxygen fuelsan interesting route to improve the applicability of PCCIcombustion in diesel engines. In earlier studies, performed on aheavy-duty engine, cyclic oxygenates were found to consistentlyoutperform their straight and branched counterparts with respect tocurbing soot. This was attributed to a considerably lower CN.The oxygenate in question, cyclohexanone (C₆H₁₀O), has theadvantage of being producible in a renewable way from lignin, asecond generation biomass waste stream (e.g., paper pulp industry).To investigate the impact of cyclohexanone on diesel combustion andpollutant emissions in greater detail, a parametric test programwas carried out in a joint project between Istituto Motori (Naples)and the University of Technology Eindhoven.To decouple the influence of a low cetane number and fuel oxygencontent on the engine performance, diesel (commercial high qualitydiesel fuel), gasoline (commercial high quality gasoline) andcyclohexanone were blended into five mixtures, with varying cetanenumber or oxygen content. These blends were tested and compared ona modern single-cylinder light-duty (LD) direct injection (DI)research diesel engine. The results suggest that it is not possibleto attribute favorable performance to either CN or fuel oxygen, butrather to the combination of both properties. In nearly allinvestigated work points, a decrease in CN led to a decrease innitric oxides (NOx) and particulate matter (PM), whilstslightly increasing carbon monoxide (CO) and unburned hydrocarbons(UHC). At an equal CN, the results suggest that fuel oxygen reducessoot emissions and also plays a role in suppressing UHC and COemissions

Notes:

Vendor supplied data

Publisher Number:

2011-24-0053

Access Restriction:

Restricted for use by site license