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Effects of ambient oxygen concentration on biodiesel and diesel spray combustion under simulated engine conditions

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  • Zhang, Ji
  • Jing, Wei
  • Roberts, William L.
  • Fang, Tiegang

Abstract

This study investigates the effect of ambient oxygen concentration on biodiesel and diesel spray combustion under simulated compression-ignition engine conditions in a constant-volume chamber. The apparent heat release rate (AHRR) is calculated based on the measured pressure. High-speed imaging of OH* chemiluminescence and natural luminosity (NL) is employed to visualize the combustion process. Temporally and spatially resolved NL and OH* contour plots are obtained. The result indicates that AHRR depends monotonically on the ambient oxygen concentration for both fuels. A lower oxygen concentration yields a slower AHRR increase rate, a lower peak AHRR value, but a higher AHRR value during the burn-out stage when compared with higher ambient oxygen concentration conditions. OH* chemiluminescence and NL contours indicate that biodiesel may experience a longer premixed-combustion duration. The 18% ambient O2 condition works better for biodiesel than diesel in reducing soot luminosity. With 12% O2, diesel combustion is significantly degraded. However, both fuels experience low temperature combustion at 10% O2. These results may imply that biodiesel is able to achieve the desired lower soot production under a moderate oxygen level with higher combustion efficiency, while diesel needs to be burned under very low ambient oxygen concentration for low soot production.

Suggested Citation

  • Zhang, Ji & Jing, Wei & Roberts, William L. & Fang, Tiegang, 2013. "Effects of ambient oxygen concentration on biodiesel and diesel spray combustion under simulated engine conditions," Energy, Elsevier, vol. 57(C), pages 722-732.
    • Handle: RePEc:eee:energy:v:57:y:2013:i:c:p:722-732
    DOI: 10.1016/j.energy.2013.05.063
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    References listed on IDEAS

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    Cited by:

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    2. Liu, Haifeng & Wang, Xin & Zheng, Zunqing & Gu, Jingbo & Wang, Hu & Yao, Mingfa, 2014. "Experimental and simulation investigation of the combustion characteristics and emissions using n-butanol/biodiesel dual-fuel injection on a diesel engine," Energy, Elsevier, vol. 74(C), pages 741-752.
    3. Chong, Cheng Tung & Hochgreb, Simone, 2017. "Flame structure, spectroscopy and emissions quantification of rapeseed biodiesel under model gas turbine conditions," Applied Energy, Elsevier, vol. 185(P2), pages 1383-1392.
    4. Lee, Sanghoon & Lee, Chang Sik & Park, Sungwook & Gupta, Jai Gopal & Maurya, Rakesh Kumar & Agarwal, Avinash Kumar, 2017. "Spray characteristics, engine performance and emissions analysis for Karanja biodiesel and its blends," Energy, Elsevier, vol. 119(C), pages 138-151.
    5. Jena, Jibanananda & Misra, Rahul Dev, 2014. "Effect of fuel oxygen on the energetic and exergetic efficiency of a compression ignition engine fuelled separately with palm and karanja biodiesels," Energy, Elsevier, vol. 68(C), pages 411-419.

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