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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

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  • Zhu, Lifeng
  • Qian, Yong
  • Wang, Xiaole
  • Lu, Xingcai

Abstract

This paper presents an experimental study on the combustion and emissions characteristics of Reactivity Controlled Compression Ignition (RCCI) combustion with n-heptane/gasoline-like fuels are researched on a single-cylinder engine. The effects of injection timing and premixed ratio are investigated. The experimental results indicate that with the advance of the direct injection timing, the ignition delay increases for all three fuels and ethanol has the longest ignition delay. The CO (carbon monoxide) and soot emissions gradually decrease while the NOx emissions increase for the three different fuels. However, HC (hydrocarbon) emissions monotonically decrease with gasoline but initially increase and then decrease with the alcohol fuels. When comparing gasoline and ethanol with the same premixed ratio and direct injection timing, the combustion phase with ethanol as port fuel occurs later than that of gasoline, especially with a higher premixed ratio. Moreover, ethanol has lower NOx and soot emissions than those of gasoline, indicating that ethanol as an alternative fuel can improve emissions in the RCCI combustion mode.

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  • 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.
    • Handle: RePEc:eee:energy:v:93:y:2015:i:p1:p:383-392
    DOI: 10.1016/j.energy.2015.09.069
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    3. Li, Jing & Ling, Xiang & Liu, Deng & Yang, Wenming & Zhou, Dezhi, 2018. "Numerical study on double injection techniques in a gasoline and biodiesel fueled RCCI (reactivity controlled compression ignition) engine," Applied Energy, Elsevier, vol. 211(C), pages 382-392.
    4. Pachiannan, Tamilselvan & Zhong, Wenjun & Rajkumar, Sundararajan & He, Zhixia & Leng, Xianying & Wang, Qian, 2019. "A literature review of fuel effects on performance and emission characteristics of low-temperature combustion strategies," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
    5. Han, Weiqiang & Li, Bolun & Pan, Suozhu & Lu, Yao & Li, Xin, 2018. "Combined effect of inlet pressure, total cycle energy, and start of injection on low load reactivity controlled compression ignition combustion and emission characteristics in a multi-cylinder heavy-d," Energy, Elsevier, vol. 165(PB), pages 846-858.
    6. Pan, Suozhu & Cai, Kai & Cai, Min & Du, Chenbo & Li, Xin & Han, Weiqiang & Wang, Xin & Liu, Daming & Wei, Jiangjun & Fang, Jia & Bao, Xiuchao, 2021. "Experimental study on the cyclic variations of ethanol/diesel reactivity controlled compression ignition (RCCI) combustion in a heavy-duty diesel engine," Energy, Elsevier, vol. 237(C).
    7. Huang, Yuhan & Hong, Guang & Huang, Ronghua, 2016. "Effect of injection timing on mixture formation and combustion in an ethanol direct injection plus gasoline port injection (EDI+GPI) engine," Energy, Elsevier, vol. 111(C), pages 92-103.
    8. 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.
    9. Zheng, Zunqing & Xia, Mingtao & Liu, Haifeng & Wang, Xiaofeng & Yao, Mingfa, 2018. "Experimental study on combustion and emissions of dual fuel RCCI mode fueled with biodiesel/n-butanol, biodiesel/2,5-dimethylfuran and biodiesel/ethanol," Energy, Elsevier, vol. 148(C), pages 824-838.
    10. Ayat Gharehghani & Alireza Kakoee & Amin Mahmoudzadeh Andwari & Thanos Megaritis & Apostolos Pesyridis, 2021. "Numerical Investigation of an RCCI Engine Fueled with Natural Gas/Dimethyl-Ether in Various Injection Strategies," Energies, MDPI, vol. 14(6), pages 1-25, March.
    11. Zhong, Yingzi & Han, Weiqiang & Jin, Chao & Tian, Xiaocong & Liu, Haifeng, 2022. "Study on effects of the hydroxyl group position and carbon chain length on combustion and emission characteristics of Reactivity Controlled Compression Ignition (RCCI) engine fueled with low-carbon st," Energy, Elsevier, vol. 239(PC).

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