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Experimental and numerical study of pre-injection effects on diesel-n-butanol blends combustion

Author

Listed:
  • Huang, Haozhong
  • Zhu, Zhaojun
  • Zhu, Jizhen
  • Lv, Delin
  • Pan, Yuping
  • Wei, Hongling
  • Teng, Wenwen

Abstract

A trade-off inevitably exists between soot and NOX emissions in a traditional engine. The addition of an oxygen-containing biofuel can decrease the soot emission but increase the NOX emission. Multi-injection strategy can be used to decrease the NOX emission. Therefore, both simulations and experimental tests were conducted to evaluate the influences of pre-injection on the combustion and emission characteristics of pure diesel (D100) and diesel/n-butanol (30% n-butanol and 70% diesel by volume, B30). The results showed that as the pre-injection interval decreased, the in-cylinder pressure peak increased, the pre-injection heat release ratio increased, and the brake-specific fuel consumption (BSFC) decreased. Only at a small pre-injection interval, the BSFC under pre-injection condition was lower than that obtained using the single injection strategy. When the same pre-injection strategy was used, B30 had a higher BSFC and lower brake thermal efficiency than D100. The soot emission decreased with the increase in pre-injection interval but increased with the increase in pre-injection ratio. More soot was emitted using the pre-injection strategy than that using single injection strategy. B30 had a lower soot emission than D100 due to a longer ignition delay. As the pre-injection interval increased, the decreasing amplitude of NO production became smaller than the increasing amplitude of NO2 production, thus increasing the net NOX emission. As the pre-injection ratio increased, more CO was produced through the reaction paths CH2O → HCO → CO, whereas the transformation of CO to CO2 almost remained unchanged, thus increasing the net CO emission. The increase in pre-injection ratio inhibited the oxidation of CO to CO2 and thus increased the CO emission. The amount of unburned hydrocarbons increased with the increase in both pre-injection ratio and interval.

Suggested Citation

  • Huang, Haozhong & Zhu, Zhaojun & Zhu, Jizhen & Lv, Delin & Pan, Yuping & Wei, Hongling & Teng, Wenwen, 2019. "Experimental and numerical study of pre-injection effects on diesel-n-butanol blends combustion," Applied Energy, Elsevier, vol. 249(C), pages 377-391.
    • Handle: RePEc:eee:appene:v:249:y:2019:i:c:p:377-391
    DOI: 10.1016/j.apenergy.2019.04.163
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    References listed on IDEAS

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    2. Chang, Ke & Ji, Changwei & Wang, Shuofeng & Yang, Jinxin & Wang, Huaiyu & Xin, Gu & Meng, Hao, 2022. "Numerical investigation of the combined effect of injection angle and injection pressure in a gasoline direct injection rotary engine," Energy, Elsevier, vol. 254(PB).

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