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Dual-fuel engines fueled with n-butanol/n-octanol and n-butanol/DNBE: A comparative study of combustion and emissions characteristics

Author

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  • Deng, Xiaorong
  • Li, Jing
  • Liang, Yifei
  • Yang, Wenming

Abstract

The dual-fuel combustion mode has drawn much attention due to its high thermal efficiency and low emissions. In this study, to realize the dual-fuel combustion, n-butanol was selected as the port-injected fuel (PIF); whereas two C8-biofuels, i.e., n-octanol and di-n-butyl ether (DNBE), were used as the direct-injected fuels, respectively. A comparative study between n-butanol/n-octanol and n-butanol/DNBE fueled dual-fuel engines in terms of their combustion and emissions characteristics was numerically carried out with the KIVA4-CHEMKIN code. The energy fractions of PIF varied from 0 to 0.4 at 1500 rpm and 2280 rpm. The results show that with the PIF increasing, the peak pressure and CO emissions increase, while the combustion duration gets shorter. Though adding more n-butanol contributes to a lower global fuel reactivity, the ignition delay is still shortened. Compared with the n-butanol/n-octanol engine, the n-butanol/DNBE engine exhibits a shorter ignition delay due to the high reactivity of DNBE. Also, it has a lower maximum pressure rise rate and longer combustion duration for its diffusion combustion phase. Consequently, a higher indicated thermal efficiency and much lower CO emissions are observed in the n-butanol/DNBE dual-fuel engine, with the expense of a slight increase in NOx emissions.

Suggested Citation

  • Deng, Xiaorong & Li, Jing & Liang, Yifei & Yang, Wenming, 2023. "Dual-fuel engines fueled with n-butanol/n-octanol and n-butanol/DNBE: A comparative study of combustion and emissions characteristics," Energy, Elsevier, vol. 263(PC).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pc:s0360544222027906
    DOI: 10.1016/j.energy.2022.125904
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    References listed on IDEAS

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    Cited by:

    1. Liu, Zengbin & Zhen, Xudong & Geng, Jie & Tian, Zhi, 2024. "Effects of injection timing on mixture formation, combustion, and emission characteristics in a n-butanol direct injection spark ignition engine," Energy, Elsevier, vol. 295(C).
    2. Cesar de Lima Nogueira, Silvio & Och, Stephan Hennings & Moura, Luis Mauro & Domingues, Eric & Coelho, Leandro dos Santos & Mariani, Viviana Cocco, 2023. "Prediction of the NOx and CO2 emissions from an experimental dual fuel engine using optimized random forest combined with feature engineering," Energy, Elsevier, vol. 280(C).

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