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Ignition strategy optimization of novel n-butanol doping kerosene elliptical rotary engine using air-assisted direct injection: Combustion characteristics, thermodynamic and environmental performance improvement evaluation

Author

Listed:
  • Du, Yang
  • Zhang, Zeqi
  • Pan, Yuyang
  • Yang, Zhenghao
  • Gao, Xu
  • He, Guangyu

Abstract

This paper proposes a novel n-butanol-blended kerosene elliptical rotary engine using air-assisted direct injection system (AADIS) to enhance fuel atomization. A three-dimensional CFD simulation model of novel engine is established. Air-assisted fuel spray model is verified by experimental comparison. The impacts of ignition advance angle (IAA) and ignition position on engine combustion characteristics, thermodynamic and environmental performance under oxygen-rich conditions are studied. The results show that although a small number of fuel droplets adheres to the wall of mixing chamber of AADIS, more fuel moves to right side of combustion chamber in later stage of air-fuel mixing. The peak mass of OH groups, thermal efficiency, CO and NOx emission intensity show an initial increasing and then decreasing trend with increasing IAA at middle ignition position, while the sum of stagnant-combustion and rapid-combustion duration shows an opposite trend. Compared with IAA of 40°CA before top dead center (BTDC), the IAA of 20°CA BTDC presents a 35.78 % increase in heat release rate peak, a 2.42 % increase in indicated thermal efficiency, and a 4.06 % decrease in carbon oxide emission intensity. The right-front ignition position not only presents a relatively short stagnant-combustion and rapid-combustion durations, but also a long slow-combustion duration. The right-front ignition position with IAA of 20°CA BTDC is recommended as the optimal ignition strategy owing to the competitive thermodynamic and environmental performance. A 6.39 % higher indicated thermal efficiency, a 7.94 % lower carbon oxide emission intensity and a 14.9 % lower NOx emission intensity are obtained at right-front ignition position at most.

Suggested Citation

  • Du, Yang & Zhang, Zeqi & Pan, Yuyang & Yang, Zhenghao & Gao, Xu & He, Guangyu, 2026. "Ignition strategy optimization of novel n-butanol doping kerosene elliptical rotary engine using air-assisted direct injection: Combustion characteristics, thermodynamic and environmental performance improvement evaluation," Energy, Elsevier, vol. 344(C).
    • Handle: RePEc:eee:energy:v:344:y:2026:i:c:s0360544226000332
    DOI: 10.1016/j.energy.2026.139931
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    References listed on IDEAS

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