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

Pham, P. X., Bodisco, T. A., Ristovski, Z., Brown, R. J. and Masri, A. R. 2014, The influence of fatty acid methyl ester profiles on inter-cycle variability in a heavy duty compression ignition engine, Fuel, vol. 116, pp. 140-150, doi: 10.1016/j.fuel.2013.07.100.

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Title The influence of fatty acid methyl ester profiles on inter-cycle variability in a heavy duty compression ignition engine
Author(s) Pham, P. X.
Bodisco, T. A.ORCID iD for Bodisco, T. A.
Ristovski, Z.
Brown, R. J.
Masri, A. R.
Journal name Fuel
Volume number 116
Start page 140
End page 150
Total pages 11
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2014-01-15
Keyword(s) Biodiesel
Unsaturation degree
Carbon chain length
Inter-cycle variability
Kernel density estimation
Summary 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.
Language eng
DOI 10.1016/j.fuel.2013.07.100
Field of Research 090599 Civil Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2013, Elsevier
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