Biodiesel Later-Phased Low Temperature Combustion Ignition and Burn Rate Behavior on Engine Torque Texas A&M University

Format:

Conference/Event

Author/Creator:

Tompkins, Tompkins, author.

Contributor:

Bittle, Joshua

Jacobs, Timothy J.

Song, Hoseok

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:

Finding a replacement for fossil fuels is critical for thefuture of automotive transportation. The compression ignition (CI)engine is an important aspect of everyday life by means oftransportation and shipping of materials. Biodiesel is a viableaugmentation for conventional diesel fuel in compression ignitionengines. Biodiesel-fuelled diesel engines produce less particulatematter (PM) relative to conventional diesel and biodiesel has theability to be a carbon dioxide (CO₂) neutral fuel, which may comeunder government regulation as a greenhouse gas. Although biodieselis a viable diesel replacement and has certain emissions benefits,it typically also has a known characteristic of higher oxides ofnitrogen (NOx) emissions relative to petroleum diesel.Advanced modes of combustion such as low temperature combustion(LTC) have attained much attention due to ever-increasing emissionstandards, and could also help reduce NOx in biodiesel.LTC has the ability to simultaneously reduce soot and nitric oxide(NO) emissions by having lower local equivalence ratios andcombustion temperatures in order to significantly reduce soot andNO formation.Results in this study - taken from a medium-duty diesel engineusing 100% petroleum diesel, 100% palm olein biodiesel, and a 20%-vblend of biodiesel into petroleum diesel - demonstrate theattainment of later-phased low temperature combustion and theability of biodiesel to sustain near-similar torque levels as ofconventional combustion. The shorter ignition delay and combustionduration of B100, the latter of which is relatively shorter thanpetroleum diesel because of the burn characteristic of the studiedbiodiesel, allow biodiesel low temperature combustion to take placeearlier in the combustion stroke than if petroleum diesel wereused. Comparatively, the 20%-v blend also shows improved sustainedtorque, but less so than the 100% biodiesel. The biodiesel fuelsalso show improved combustion efficiency relative to the petroleumdiesel at the low temperature combustion condition, furtherimproving the engine's torque. Results of nitric oxide and sootconcentrations are compared; differences in combustion phasing,exhaust gas recirculation level, and initial temperatures, however,render a direct comparison in these exhaust species among the fuelsinvalid

Notes:

Vendor supplied data

Publisher Number:

2012-01-1305

Access Restriction:

Restricted for use by site license