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Numerical study on ignition amelioration of a hydrogen-enriched Wankel engine under lean-burn condition

Author

Listed:
  • Shi, Cheng
  • Ji, Changwei
  • Ge, Yunshan
  • Wang, Shuofeng
  • Bao, Jianhui
  • Yang, Jinxin

Abstract

For the hydrogen-enriched spark-ignited Wankel engine, the optimization of ignition strategy is conducive to improve combustion performance and specifically effective to lessen the unburned region due to the elongated rotor chamber. In this paper, the role of the number of the ignition source, twin-spark plug location, asynchronous ignition, and energy allocation in improving lean combustion was investigated through the three-dimensional computational fluid dynamics model coupling with kinetic mechanisms. The model was validated by experiment, and good agreements between measured and predicted combustion pressure and the heat release rate was obtained. Results showed that the improvements of engine combustion were limited by single-spark ignition strategies, and the twin-spark ignition configuration was capable of enhancing combustion efficiency drastically. The arrangement of the twin-spark plug determined the space for flame development, and it was favorable for the trailing plug to stand a greater offset from the minor axis of the engine. An earlier leading-spark ignition enabled flame propagation faster and occurred quenching rapidly, which contributed to higher pressure-output and better heat-release. The higher energy of leading-spark ignition made the mixture consumption faster, combustion pressure higher, and combustion duration shorter. The optimum strategy on combustion was expressed as follows: the location of trailing-spark plug is offset from the minor axis by 20.7 mm; the spark timing and discharge energy of leading-spark plug is 325°EA and 0.03 J, respectively; and those of trailing-spark plug is 335°EA and 0.01 J. It was recommended that the leading-spark ignition was set earlier and stronger for practical operations.

Suggested Citation

  • Shi, Cheng & Ji, Changwei & Ge, Yunshan & Wang, Shuofeng & Bao, Jianhui & Yang, Jinxin, 2019. "Numerical study on ignition amelioration of a hydrogen-enriched Wankel engine under lean-burn condition," Applied Energy, Elsevier, vol. 255(C).
    • Handle: RePEc:eee:appene:v:255:y:2019:i:c:s0306261919314874
    DOI: 10.1016/j.apenergy.2019.113800
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    Citations

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    Cited by:

    1. Shi, Cheng & Chai, Sen & Di, Liming & Ji, Changwei & Ge, Yunshan & Wang, Huaiyu, 2023. "Combined experimental-numerical analysis of hydrogen as a combustion enhancer applied to wankel engine," Energy, Elsevier, vol. 263(PC).
    2. Shi, Cheng & Ji, Changwei & Ge, Yunshan & Wang, Shuofeng & Yang, Jinxin & Wang, Huaiyu, 2021. "Effects of split direct-injected hydrogen strategies on combustion and emissions performance of a small-scale rotary engine," Energy, Elsevier, vol. 215(PA).
    3. Yan, Xiaodong & Feng, Huihua & Zuo, Zhengxing & Zhang, Zhiyuan & Wu, Limin & Shi, Cheng, 2021. "A study on the working characteristics of free piston linear generator with dual cylinder configuration by different secondary injection strategies," Energy, Elsevier, vol. 233(C).
    4. Zou, Run & Li, Yuan & Liu, Jinxiang & Wang, Nana & Zeng, Qinghan & Li, Jiong, 2023. "Numerical study on the effects of spark strategies on knocking combustion in a downsized gasoline rotary engine," Energy, Elsevier, vol. 263(PD).
    5. Yuan, Chenheng & Peng, Shizhuo & Zhou, Lifu, 2023. "Multi-field coupling effect of injection on dynamics and thermodynamics of a linear combustion engine generator with slow compression and fast expansion," Energy, Elsevier, vol. 270(C).
    6. Gong, Changming & Yi, Lin & Zhang, Zilei & Sun, Jingzhen & Liu, Fenghua, 2020. "Assessment of ultra-lean burn characteristics for a stratified-charge direct-injection spark-ignition methanol engine under different high compression ratios," Applied Energy, Elsevier, vol. 261(C).
    7. Qi Geng & Xuede Wang & Yang Du & Zhenghao Yang & Rui Wang & Guangyu He, 2022. "Effect of the Hydrogen Injection Position on the Combustion Process of a Direct Injection X-Type Rotary Engine with a Hydrogen Blend," Energies, MDPI, vol. 15(19), pages 1-19, October.
    8. Meng, Hao & Ji, Changwei & Yang, Jinxin & Chang, Ke & Xin, Gu & Wang, Shuofeng, 2022. "Experimental understanding of the relationship between combustion/flow/flame velocity and knock in a hydrogen-fueled Wankel rotary engine," Energy, Elsevier, vol. 258(C).
    9. Santanu Kumar Dash & Suprava Chakraborty & Michele Roccotelli & Umesh Kumar Sahu, 2022. "Hydrogen Fuel for Future Mobility: Challenges and Future Aspects," Sustainability, MDPI, vol. 14(14), pages 1-22, July.
    10. Gong, Changming & Yi, Lin & Wang, Kang & Huang, Kuo & Liu, Fenghua, 2020. "Numerical study on electron energy distribution characteristics and evolution of active particles of methanol-air mixture by non-equilibrium plasma," Energy, Elsevier, vol. 193(C).

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