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

Pham, P.X., Bodisco, T.A., Stevanovic, S., Rahman, M.D., Wang, H., Ristovski, Z.D., Brown, R.J., & 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, 6(1), pp. 188-198.

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Abstract

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.

Impact and interest:

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ID Code: 58658
Item Type: Journal Article
Refereed: Yes
Additional Information: This paper was also presented at the SAE 2013 World Congress & Exhibition, Detroit, Michigan, 16 April 2013.
Keywords: Biodiesel, fatty acid methyl ester, saturation degree, unsaturation degree, chain length, saponification number, NOx, particle mass concentration, particle size distribution, reactive oxygen species, iodine value
DOI: 10.4271/2013-01-1680
ISSN: 1946-3952
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > ATMOSPHERIC SCIENCES (040100)
Australian and New Zealand Standard Research Classification > ENVIRONMENTAL SCIENCES (050000) > ENVIRONMENTAL SCIENCE AND MANAGEMENT (050200) > Environmental Monitoring (050206)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 SAE International
Deposited On: 25 Mar 2013 23:31
Last Modified: 16 Mar 2016 02:22

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