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Effects of ethanol addition on biodiesel combustion: A modeling study

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  • An, H.
  • Yang, W.M.
  • Li, J.

Abstract

The present study aims to numerically investigate the impacts of ethanol blend ratio together with advanced fuel injection timings on biodiesel’s performance, combustion and emission characteristics. Simulations were conducted using coupled KIVA–CHEMKIN code for neat biodiesel and its blend fuels with 5%, 10% and 20% (vol.%) of ethanol at a fix engine speed of 2400rpm under 10%, 50% and 100% engine load conditions, with and without advanced fuel injection timings of 2°, 3° and 5° crank angle. A skeletal reaction mechanism was constructed to include the significant oxidation and emission formation kinetics of biodiesel and ethanol fuels, and it was validated by performing the 0-D ignition delay predictions, as well as 3-D numerical simulations against the experimental results. The results indicate that peak cylinder pressure and indicated thermal efficiency generally decrease with the increasing ethanol blend ratio due to its prolonged ignition delay and reduced heating value. In terms of emissions, the CO emissions generally increase as the ethanol blend ratio increases, while the NOx emissions are reduced. The soot emissions increases under 10% load conditions, but reduced under 50% and 100% load conditions. With advanced fuel injection timings, the combustion process seems to be improved under 10% and 100% engine load conditions. For the efficient use of biodiesel/ethanol blend fuels, it is suggested that the ethanol blend ratio and advanced fuel injection timing should be carefully selected based on the engine operating conditions.

Suggested Citation

  • An, H. & Yang, W.M. & Li, J., 2015. "Effects of ethanol addition on biodiesel combustion: A modeling study," Applied Energy, Elsevier, vol. 143(C), pages 176-188.
    • Handle: RePEc:eee:appene:v:143:y:2015:i:c:p:176-188
    DOI: 10.1016/j.apenergy.2015.01.033
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    References listed on IDEAS

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    1. Hulwan, Dattatray Bapu & Joshi, Satishchandra V., 2011. "Performance, emission and combustion characteristic of a multicylinder DI diesel engine running on diesel–ethanol–biodiesel blends of high ethanol content," Applied Energy, Elsevier, vol. 88(12), pages 5042-5055.
    2. An, H. & Yang, W.M. & Chou, S.K. & Chua, K.J., 2012. "Combustion and emissions characteristics of diesel engine fueled by biodiesel at partial load conditions," Applied Energy, Elsevier, vol. 99(C), pages 363-371.
    3. An, H. & Yang, W.M. & Maghbouli, A. & Li, J. & Chou, S.K. & Chua, K.J., 2013. "Performance, combustion and emission characteristics of biodiesel derived from waste cooking oils," Applied Energy, Elsevier, vol. 112(C), pages 493-499.
    4. Maghbouli, Amin & Yang, Wenming & An, Hui & Li, Jing & Chou, Siaw Kiang & Chua, Kian Jon, 2013. "An advanced combustion model coupled with detailed chemical reaction mechanism for D.I diesel engine simulation," Applied Energy, Elsevier, vol. 111(C), pages 758-770.
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    3. 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).
    4. S. M. Ashrafur Rahman & I. M. Rizwanul Fattah & Hwai Chyuan Ong & M. F. M. A. Zamri, 2021. "State-of-the-Art of Strategies to Reduce Exhaust Emissions from Diesel Engine Vehicles," Energies, MDPI, vol. 14(6), pages 1-24, March.
    5. Upendra Rajak & Abhishek Dasore & Prem Kumar Chaurasiya & Tikendra Nath Verma & Prerana Nashine & Anil Kumar, 2023. "Effects of microalgae -ethanol-methanol-diesel blends on the spray characteristics and emissions of a diesel engine," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 25(1), pages 1-22, January.

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