The influence of fatty acid methyl ester profiles on inter-cycle variability in a heavy duty compression ignition engine

Pham, Phuong X., Bodisco, Timothy A., Ristovski, Zoran D., Brown, Richard J., & Masri, Assaad R. (2014) The influence of fatty acid methyl ester profiles on inter-cycle variability in a heavy duty compression ignition engine. Fuel, 116, pp. 140-150.

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With the advent of alternative fuels, such as biodiesels and related blends, it is important to develop an understanding of their effects on inter-cycle variability which, in turn, influences engine performance as well as its emission. Using four methanol trans-esterified biomass fuels of differing carbon chain length and degree of unsaturation, this paper provides insight into the effect that alternative fuels have on inter-cycle variability. The experiments were conducted with a heavy-duty Cummins, turbo-charged, common-rail compression ignition engine. Combustion performance is reported in terms of the following key in-cylinder parameters: indicated mean effective pressure (IMEP), net heat release rate (NHRR), standard deviation of variability (StDev), coefficient of variation (CoV), peak pressure, peak pressure timing and maximum rate of pressure rise. A link is also established between the cyclic variability and oxygen ratio, which is a good indicator of stoichiometry.

The results show that the fatty acid structures did not have a significant effect on injection timing, injection duration, injection pressure, StDev of IMEP, or the timing of peak motoring and combustion pressures. However, a significant effect was noted on the premixed and diffusion combustion proportions, combustion peak pressure and maximum rate of pressure rise. Additionally, the boost pressure, IMEP and combustion peak pressure were found to be directly correlated to the oxygen ratio. The emission of particles positively correlates with oxygen content in the fuel as well as in the air-fuel mixture resulting in a higher total number of particles per unit of mass.

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12 citations in Scopus
7 citations in Web of Science®
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ID Code: 62415
Item Type: Journal Article
Refereed: Yes
Keywords: Biodiesel, Unsaturation degree, Carbon chain length, Inter-cycle variability, Kernel density estimates
DOI: 10.1016/j.fuel.2013.07.100
ISSN: 0016-2361
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > AUTOMOTIVE ENGINEERING (090200)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > AUTOMOTIVE ENGINEERING (090200) > Automotive Combustion and Fuel Engineering (incl. Alternative/Renewable Fuels) (090201)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Elsevier Ltd.
Copyright Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Fuel. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Fuel, [Volume 116, (15 January 2014)]. DOI: 10.1016/j.fuel.2013.07.100
Deposited On: 12 Sep 2013 00:15
Last Modified: 01 Feb 2016 18:57

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