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Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion Conditions

Author

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  • Zhaowen Wang

    (State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Shang Wu

    (State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Yuhan Huang

    (School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia)

  • Yulin Chen

    (Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720, USA)

  • Shuguo Shi

    (State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Xiaobei Cheng

    (State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Ronghua Huang

    (State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

Abstract

The combination of emulsified diesel and low temperature combustion (LTC) technology has great potential in reducing engine emissions. A visualization study on the spray and combustion characteristics of water emulsified diesel was conducted experimentally in a constant volume chamber under conventional and LTC conditions. The effects of ambient temperature on the evaporation, ignition and combustion characteristics of water emulsified diesel were studied under cold, evaporating and combustion conditions. Experimental results showed that the ambient temperature had little effect on the spray structures, in terms of the liquid core length, the spray shape and the spray area. However, higher ambient temperature slightly reduced the Sauter Mean Diameter (SMD) of the spray droplets. The auto-ignition delay time increased significantly with the decrease of the ambient temperature. The ignition process always occurred at the entrainment region near the front periphery of the liquid core. This entrainment region was evolved from the early injected fuel droplets which were heated and mixed by the continuous entrainment until the local temperature and equivalence ratio reached the ignition condition. The maximum value of integrated natural flame luminosity (INFL) reduced by 60% when the ambient temperature dropped from 1000 to 800 K, indicating a significant decrease of the soot emissions could be achieved by LTC combustion mode than the conventional diesel engines.

Suggested Citation

  • Zhaowen Wang & Shang Wu & Yuhan Huang & Yulin Chen & Shuguo Shi & Xiaobei Cheng & Ronghua Huang, 2017. "Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion Conditions," Energies, MDPI, vol. 10(8), pages 1-14, July.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:8:p:1109-:d:106435
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    References listed on IDEAS

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    Cited by:

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    2. Xiaoqing Zhang & Tie Li & Pengfei Ma & Bin Wang, 2017. "Spray Combustion Characteristics and Soot Emission Reduction of Hydrous Ethanol Diesel Emulsion Fuel Using Color-Ratio Pyrometry," Energies, MDPI, vol. 10(12), pages 1-13, December.
    3. Sattar Jabbar Murad Algayyim & Andrew P. Wandel & Talal Yusaf, 2018. "The Impact of Injector Hole Diameter on Spray Behaviour for Butanol-Diesel Blends," Energies, MDPI, vol. 11(5), pages 1-12, May.
    4. Wang, Zhaowen & Shi, Shuguo & Huang, Sheng & Tang, Jie & Du, Tao & Cheng, Xiaobei & Huang, Ronghua & Chen, Jyh-Yuan, 2018. "Effects of water content on evaporation and combustion characteristics of water emulsified diesel spray," Applied Energy, Elsevier, vol. 226(C), pages 397-407.
    5. Zhishuang Li & Ziman Wang & Haoyang Mo & Han Wu, 2022. "Effect of the Air Flow on the Combustion Process and Preheating Effect of the Intake Manifold Burner," Energies, MDPI, vol. 15(9), pages 1-17, April.
    6. Dmitrii V. Antonov & Roman M. Fedorenko & Pavel A. Strizhak, 2022. "Micro-Explosion Phenomenon: Conditions and Benefits," Energies, MDPI, vol. 15(20), pages 1-19, October.

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