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A new methodology for diesel surrogate fuel formulation: Bridging fuel fundamental properties and real engine combustion characteristics

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  • Qian, Yong
  • Yu, Liang
  • Li, Zilong
  • Zhang, Yahui
  • Xu, Leilei
  • Zhou, Qiyan
  • Han, Dong
  • Lu, Xingcai

Abstract

Given the complexity and uncertainty of diesel compositions, it is of great challenges to study the fundamental combustion processes and mechanism of diesel fuel, in particular the gaseous and particulate pollutant formation mechanisms. A reasonably designed diesel surrogate is proved to be an effective way to study the fundamental combustion mechanism of diesel fuel. However, most existing diesel surrogates mainly adopt light hydrocarbon components, increasing the difficulty of accurately reflecting the physical and chemical properties of practical diesel fuel or the combustion and emissions characteristics of diesel engines. Therefore, in this study, a methodology to construct diesel surrogates with C10 ∼ C18 hydrocarbon components based on fuel properties and engine combustion and emissions characteristics was proposed. First, the key physical and chemical fuel properties that affect fuel injection, atomization, ignition, combustion, engine efficiency and emissions were discussed in detail. Second, 13 candidate components were chosen to represent n-alkanes, iso-alkanes, cycloparaffins and aromatics and blended with commercial diesel fuel in different proportions. Fuel injection, spray, ignition and combustion phase, engine efficiency and emissions versus changed blending component and proportion were systematically investigated. In particular, the effects of the cetane number and fuel volatility on combustion and emissions were investigated under fixed injection timing and fixed ignition timing conditions, respectively. Afterward, the key physical and chemical parameters of the surrogate fuels were defined, and the constraint equations were constructed for different parameters. Considered the uncertainties in the components and physicochemical properties of the actual diesel fuel, it is believed that the construction of surrogate fuel has only reasonable solutions and there is no optimal solution. Finally, three diesel surrogates were proposed from the feasible domains of constraint equations, including a 3-Components surrogate (41.3% n-hexadecane, 36.8% 2,2,4,4,6,8,8-heptamethylnonane (HMN), 21.9% 1-methylnaphthalene, by mol.), a 5-Components surrogate (21.6% n-hexadecane, 15.5% n-octadecane, 26.0% HMN, 20.7% 1-methylnaphthalene, 16.2% decalin, by mol.) and a 7-Components surrogate (21.5% n-hexadecane, 15.4% n-octadecane, 25.8% HMN, 13.7% 1-methylnaphthalene, 8.1% decalin, 8.1% n-butylbenzene, 7.4% n-butylcyclohexane, by mol.). It is found that the surrogates proposed in this study can accurately reproduce actual engine combustion characteristics. Also, the gaseous emissions of the 5-Components surrogate are closest to those of the target diesel fuel in the tested engine operation conditions.

Suggested Citation

  • Qian, Yong & Yu, Liang & Li, Zilong & Zhang, Yahui & Xu, Leilei & Zhou, Qiyan & Han, Dong & Lu, Xingcai, 2018. "A new methodology for diesel surrogate fuel formulation: Bridging fuel fundamental properties and real engine combustion characteristics," Energy, Elsevier, vol. 148(C), pages 424-447.
    • Handle: RePEc:eee:energy:v:148:y:2018:i:c:p:424-447
    DOI: 10.1016/j.energy.2018.01.181
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    References listed on IDEAS

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    1. Zhu, Lifeng & Qian, Yong & Wang, Xiaole & Lu, Xingcai, 2015. "Effects of direct injection timing and premixed ratio on combustion and emissions characteristics of RCCI (Reactivity Controlled Compression Ignition) with N-heptane/gasoline-like fuels," Energy, Elsevier, vol. 93(P1), pages 383-392.
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    2. Zhang, Yanzhi & Li, Zilong & Tamilselvan, Pachiannan & Jiang, Chenxu & He, Zhixia & Zhong, Wenjun & Qian, Yong & Wang, Qian & Lu, Xingcai, 2019. "Experimental study of combustion and emission characteristics of gasoline compression ignition (GCI) engines fueled by gasoline-hydrogenated catalytic biodiesel blends," Energy, Elsevier, vol. 187(C).
    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. Qian, Yong & Wu, Zhiyong & Guo, Jinjing & Li, Zilong & Jiang, Chenxu & Lu, Xingcai, 2019. "Experimental studies on the key parameters controlling the combustion and emission in premixed charge compression ignition concept based on diesel surrogates," Applied Energy, Elsevier, vol. 235(C), pages 233-246.
    5. Nawar Al-Esawi & Mansour Al Qubeissi & Ruslana Kolodnytska, 2019. "The Impact of Biodiesel Fuel on Ethanol/Diesel Blends," Energies, MDPI, vol. 12(9), pages 1-11, May.
    6. Zhang, Qiankun & Xia, Jin & He, Zhuoyao & Wang, Jianping & Liu, Rui & Zheng, Liang & Qian, Yong & Ju, Dehao & Lu, Xingcai, 2021. "Experimental study on spray characteristics of six-component diesel surrogate fuel under sub/trans/supercritical conditions with different injection pressures," Energy, Elsevier, vol. 218(C).
    7. Kroyan, Yuri & Wojcieszyk, Michal & Kaario, Ossi & Larmi, Martti & Zenger, Kai, 2020. "Modeling the end-use performance of alternative fuels in light-duty vehicles," Energy, Elsevier, vol. 205(C).

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