Engine performance characteristics for biodiesels of different degrees of saturation and carbon chain lengths

Pham, P.X., Bodisco, Timothy A., Stevanovic, S., Rahman, M.D., Wang, H., Ristovski, Z.D., Brown, R.J. and Masri, A.R. 2013, Engine performance characteristics for biodiesels of different degrees of saturation and carbon chain lengths, SAE international journal of fuels and lubricants, vol. 6, no. 1, pp. 188-198, doi: 10.4271/2013-01-1680.

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Title Engine performance characteristics for biodiesels of different degrees of saturation and carbon chain lengths
Author(s) Pham, P.X.
Bodisco, Timothy A.ORCID iD for Bodisco, Timothy A. orcid.org/0000-0002-5163-4762
Stevanovic, S.
Rahman, M.D.
Wang, H.
Ristovski, Z.D.
Brown, R.J.
Masri, A.R.
Journal name SAE international journal of fuels and lubricants
Volume number 6
Issue number 1
Start page 188
End page 198
Total pages 11
Publisher SAE International
Place of publication Warrendale, Pa.
Publication date 2013-04-08
ISSN 1946-3952
Keyword(s) biodiesel
fatty acid methyl ester
saturation degree
unsaturation degree
chain length
iodine value
saponification number
particle mass concentration
particle size distribution
reactive oxygen species
Summary This experimental study examines the effect on performance and emission outputs of a compression ignition engine operating on biodiesels of varying carbon chain length and the degree of unsaturation. A well-instrumented, heavy-duty, multi-cylinder, common-rail, turbo-charged diesel engine was used to ensure that the results contribute in a realistic way to the ongoing debate about the impact of biofuels. Comparative measurements are reported for engine performance as well as the emissions of NOx, particle number and size distribution, and the concentration of the reactive oxygen species (which provide a measure of the toxicity of emitted particles).

It is shown that the biodiesels used in this study produce lower mean effective pressure, somewhat proportionally with their lower calorific values; however, the molecular structure has been shown to have little impact on the performance of the engine. The peak in-cylinder pressure is lower for the biodiesels that produce a smaller number of emitted particles, compared to fossil diesel, but the concentration of the reactive oxygen species is significantly higher because of oxygen in the fuels.

The differences in the physicochemical properties amongst the biofuels and the fossil diesel significantly affect the engine combustion and emission characteristics. Saturated short chain length fatty acid methyl esters are found to enhance combustion efficiency, reduce NOx and particle number concentration, but results in high levels of fuel consumption.
Language eng
DOI 10.4271/2013-01-1680
Field of Research 090201 Automotive Combustion and Fuel Engineering (incl Alternative/Renewable Fuels)
Socio Economic Objective 850501 Biofuel (Biomass) Energy
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2013, SAE International
Persistent URL http://hdl.handle.net/10536/DRO/DU:30082236

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