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

P.X. Pham, T.A. Bodisco, S. Stevanovic, M.D. Rahman, H. Wang, Richard J. Brown, Z.D. Ristovski, A.R. Masri

Research output: Contribution to journalArticle

2 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)188-198
Number of pages11
JournalSAE Technical Papers
Volume6
Issue number1
DOIs
Publication statusPublished - 8 Apr 2013

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Chain length
Engines
Carbon
Biofuels
Engine cylinders
Oxygen
Calorific value
Fatty acids
Fuel consumption
Molecular structure
Toxicity
Ignition
Diesel engines
Rails
Esters

Cite this

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.; Brown, Richard J.; Ristovski, Z.D.; Masri, A.R.

In: SAE Technical Papers, Vol. 6, No. 1, 08.04.2013, p. 188-198.

Research output: Contribution to journalArticle

Pham, PX, Bodisco, TA, Stevanovic, S, Rahman, MD, Wang, H, Brown, RJ, Ristovski, ZD & Masri, AR 2013, 'Engine performance characteristics for biodiesels of different degrees of saturation and carbon chain lengths' SAE Technical Papers, vol. 6, no. 1, pp. 188-198. https://doi.org/10.4271/2013-01-1680
Pham, P.X. ; Bodisco, T.A. ; Stevanovic, S. ; Rahman, M.D. ; Wang, H. ; Brown, Richard J. ; Ristovski, Z.D. ; Masri, A.R. / Engine performance characteristics for biodiesels of different degrees of saturation and carbon chain lengths. In: SAE Technical Papers. 2013 ; Vol. 6, No. 1. pp. 188-198.
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