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Combustion and emission characteristics of an ultra-lean burn gasoline engine with dimethyl ether auto-ignition

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  • He, Bang-Quan
  • Xu, Si-Peng
  • Fu, Xue-Qing
  • Zhao, Hua

Abstract

To stabilize combustion and shorten combustion duration in ultra-lean homogeneous gasoline-air mixture conditions, the onset of combustion is initiated with the auto-ignition of direct injection dimethyl ether (DME) only through compression in a single-cylinder four-stroke gasoline engine at the lambda of 2.1 at fixed cycle energy. The results show that the heat release processes are dependent on the total DME energy fraction in a cycle in the case of single and split direct injection and the DME fraction in each injection in the case of split direct injection. Increased total DME energy fraction in a cycle decreases the in-cylinder temperature to start low temperature combustion. High DME energy fraction in the second direct injection at a fixed total DME energy fraction in a cycle advances ignition timing, shortens combustion duration and decreases cycle-by-cycle variation of combustion while nitrogen oxides emissions increase although hydrocarbon and carbon monoxide emissions decrease simultaneously. The decrease of the total DME energy fraction in a cycle or that of DME fraction in the second injection at a fixed total DME energy fraction in a cycle is beneficial to the reduction of NOx emissions.

Suggested Citation

  • He, Bang-Quan & Xu, Si-Peng & Fu, Xue-Qing & Zhao, Hua, 2020. "Combustion and emission characteristics of an ultra-lean burn gasoline engine with dimethyl ether auto-ignition," Energy, Elsevier, vol. 209(C).
    • Handle: RePEc:eee:energy:v:209:y:2020:i:c:s0360544220315450
    DOI: 10.1016/j.energy.2020.118437
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    References listed on IDEAS

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    1. Benajes, J. & Novella, R. & Gomez-Soriano, J. & Martinez-Hernandiz, P.J. & Libert, C. & Dabiri, M., 2019. "Evaluation of the passive pre-chamber ignition concept for future high compression ratio turbocharged spark-ignition engines," Applied Energy, Elsevier, vol. 248(C), pages 576-588.
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    4. Shi, Lei & Ji, Changwei & Wang, Shuofeng & Su, Teng & Cong, Xiaoyu & Wang, Du & Tang, Chuanqi, 2019. "Effects of second injection timing on combustion characteristics of the spark ignition direct injection gasoline engines with dimethyl ether enrichment in the intake port," Energy, Elsevier, vol. 180(C), pages 10-18.
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    Cited by:

    1. Zhang, Yi & Kang, Yinhu & Lu, Xiaofeng & Wang, Quanhai, 2023. "Numerical study of combustion mode and diffusive transport underlying fuel ignitions in lean stratified dimethyl ether-air premixture at various turbulence intensities," Energy, Elsevier, vol. 280(C).

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