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The effect of ethanol blending on mixture formation, combustion and soot emission studied in an optical DISI engine

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  • Storch, Michael
  • Hinrichsen, Florian
  • Wensing, Michael
  • Will, Stefan
  • Zigan, Lars

Abstract

In various research studies, ethanol blended fuels have shown reduced particulate matter (PM) emissions in comparison to gasoline and its surrogate fuels in direct-injection spark-ignition (DISI) engines. However, there are also studies reporting increased particulate concentration for fuels with low ethanol content. In this work the mixture formation and sooting combustion behavior of isooctane and the mixture E20 (20vol% of ethanol in isooctane) is analyzed for catalyst heating operation. These operating conditions are critical as they strongly contribute to overall soot emissions in driving cycles. Simultaneous high speed imaging of OH∗–chemiluminescence and natural soot luminosity measurements are performed in combination with primary particle concentration measurements using a laser induced incandescence (LII) sensor in the engine exhaust duct. At these operating conditions E20 exhibits a higher sooting tendency as compared to isooctane. In order to identify the reason for increased soot formation, the mixture formation process is analyzed by planar laser induced fluorescence (LIF) measurements. The results show that soot was formed in fuel rich regions with incomplete evaporated fuel droplets remaining from the injection event. A different evaporation process of E20 fuel spray and mixing behavior is indicated showing a more compact rich mixture cloud with surrounding lean areas near the spark plug region. This mixture stratification is characterized by higher cyclic variations and constitutes a significant source of soot formation.

Suggested Citation

  • Storch, Michael & Hinrichsen, Florian & Wensing, Michael & Will, Stefan & Zigan, Lars, 2015. "The effect of ethanol blending on mixture formation, combustion and soot emission studied in an optical DISI engine," Applied Energy, Elsevier, vol. 156(C), pages 783-792.
    • Handle: RePEc:eee:appene:v:156:y:2015:i:c:p:783-792
    DOI: 10.1016/j.apenergy.2015.06.030
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    References listed on IDEAS

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    1. Daniel, Ritchie & Xu, Hongming & Wang, Chongming & Richardson, Dave & Shuai, Shijin, 2013. "Gaseous and particulate matter emissions of biofuel blends in dual-injection compared to direct-injection and port injection," Applied Energy, Elsevier, vol. 105(C), pages 252-261.
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    Cited by:

    1. Lee, Ziyoung & Park, Sungwook, 2020. "Particulate and gaseous emissions from a direct-injection spark ignition engine fueled with bioethanol and gasoline blends at ultra-high injection pressure," Renewable Energy, Elsevier, vol. 149(C), pages 80-90.
    2. Lars Zigan, 2018. "Overview of Electric Field Applications in Energy and Process Engineering," Energies, MDPI, vol. 11(6), pages 1-33, May.
    3. Qian, Yong & Li, Zilong & Yu, Liang & Wang, Xiaole & Lu, Xingcai, 2019. "Review of the state-of-the-art of particulate matter emissions from modern gasoline fueled engines," Applied Energy, Elsevier, vol. 238(C), pages 1269-1298.
    4. Hergueta, C. & Tsolakis, A. & Herreros, J.M. & Bogarra, M. & Price, E. & Simmance, K. & York, A.P.E. & Thompsett, D., 2018. "Impact of bio-alcohol fuels combustion on particulate matter morphology from efficient gasoline direct injection engines," Applied Energy, Elsevier, vol. 230(C), pages 794-802.
    5. Nabi, M.N. & Rasul, M.G. & Rahman, S.M.A. & Dowell, Ashley & Ristovski, Z.D. & Brown, R.J., 2019. "Study of performance, combustion and emission characteristics of a common rail diesel engine with tea tree oil-diglyme blends," Energy, Elsevier, vol. 180(C), pages 216-228.
    6. Storch, Michael & Koegl, Matthias & Altenhoff, Michael & Will, Stefan & Zigan, Lars, 2016. "Investigation of soot formation of spark-ignited ethanol-blended gasoline sprays with single- and multi-component base fuels," Applied Energy, Elsevier, vol. 181(C), pages 278-287.
    7. Anbari Attar, Mohammadreza & Xu, Hongming, 2016. "Experimental investigation of impacts of engine hardware, operating parameters and combustion performance on particulate emissions in a DISI engine," Applied Energy, Elsevier, vol. 177(C), pages 703-715.
    8. Wu, Shaohua & Yang, Wenming & Xu, Hongpeng & Jiang, Yu, 2019. "Investigation of soot aggregate formation and oxidation in compression ignition engines with a pseudo bi-variate soot model," Applied Energy, Elsevier, vol. 253(C), pages 1-1.
    9. Koegl, M. & Hofbeck, B. & Will, S. & Zigan, L., 2018. "Investigation of soot formation and oxidation of ethanol and butanol fuel blends in a DISI engine at different exhaust gas recirculation rates," Applied Energy, Elsevier, vol. 209(C), pages 426-434.
    10. Wang, Buyu & Mosbach, Sebastian & Schmutzhard, Sebastian & Shuai, Shijin & Huang, Yaqing & Kraft, Markus, 2016. "Modelling soot formation from wall films in a gasoline direct injection engine using a detailed population balance model," Applied Energy, Elsevier, vol. 163(C), pages 154-166.
    11. Zhang, Mengzhu & Ge, Yunshan & Wang, Xin & Xu, Hongming & Tan, Jianwei & Hao, Lijun, 2021. "Effects of ethanol and aromatic compositions on regulated and unregulated emissions of E10-fuelled China-6 compliant gasoline direct injection vehicles," Renewable Energy, Elsevier, vol. 176(C), pages 322-333.

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