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Sensitivity analyses of biodiesel thermo-physical properties under diesel engine conditions

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  • Cheng, Xinwei
  • Ng, Hoon Kiat
  • Gan, Suyin
  • Ho, Jee Hou
  • Pang, Kar Mun

Abstract

This reported work investigates the sensitivities of spray and soot developments to the change of thermo-physical properties for coconut and soybean methyl esters, using two-dimensional computational fluid dynamics fuel spray modelling. The choice of test fuels made was due to their contrasting saturation-unsaturation compositions. The sensitivity analyses for non-reacting and reacting sprays were carried out against a total of 12 thermo-physical properties, at an ambient temperature of 900 K and density of 22.8 kg/m3. For the sensitivity analyses, all the thermo-physical properties were set as the baseline case and each property was individually replaced by that of diesel. The significance of individual thermo-physical property was determined based on the deviations found in predictions such as liquid penetration, ignition delay period and peak soot concentration when compared to those of baseline case. Among all the properties, latent heat of vaporisation produced the greatest effect on the spray and soot developments under the tested conditions, as evidenced by a longer liquid penetration of 35.0% and a reduced peak soot concentration of 22.8%. Besides, coupled effects among the thermo-physical properties were also determined. Meanwhile, the effects of thermo-physical properties were found to vary with the addition of unsaturation levels and chemical kinetics in the simulation.

Suggested Citation

  • Cheng, Xinwei & Ng, Hoon Kiat & Gan, Suyin & Ho, Jee Hou & Pang, Kar Mun, 2016. "Sensitivity analyses of biodiesel thermo-physical properties under diesel engine conditions," Energy, Elsevier, vol. 109(C), pages 341-352.
    • Handle: RePEc:eee:energy:v:109:y:2016:i:c:p:341-352
    DOI: 10.1016/j.energy.2016.04.103
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    References listed on IDEAS

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    1. Xue, Jinlin & Grift, Tony E. & Hansen, Alan C., 2011. "Effect of biodiesel on engine performances and emissions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(2), pages 1098-1116, February.
    2. An, H. & Yang, W.M. & Maghbouli, A. & Chou, S.K. & Chua, K.J., 2013. "Detailed physical properties prediction of pure methyl esters for biodiesel combustion modeling," Applied Energy, Elsevier, vol. 102(C), pages 647-656.
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    Cited by:

    1. Ashour, Mahmoud K. & Eldrainy, Yehia A. & Elwardany, Ahmed E., 2020. "Effect of cracked naphtha/biodiesel/diesel blends on performance, combustion and emissions characteristics of compression ignition engine," Energy, Elsevier, vol. 192(C).
    2. Cheng, Xinwei & Gan, Suyin & Ng, Hoon Kiat, 2020. "A numerical study on the quasi-steady spray and soot characteristics for soybean methyl ester and its blends with ethanol using CFD-reduced chemical kinetics approach," Energy, Elsevier, vol. 200(C).

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