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Non-monotonic change of ignition delay with injection pressure under low ambient temperature for the diesel spray combustion

Author

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  • Chen, Haiyan
  • Shi, Zhongjie
  • Liu, Fushui
  • Wu, Yue
  • Li, Yikai

Abstract

The impact of injection pressure on the startability of compression ignition (CI) diesel engines has not been thoroughly studied yet, especially for the startup at low-temperature conditions. This research investigates the effects of injection pressure on diesel spray and flame characteristics under low ambient temperatures (close to the critical ignition temperature of diesel spray) in a constant volume combustion chamber (CVCC) using Schlieren, Mie scattering, and direct photography. Different from past engine startability research, the ignition delay time under quasi-critical ignition temperature is measured to be first shortened then prolonged with increasing injection pressure. The primary cause of such phenomenon is analyzed to be the trade-off effects between spray atomization and heat convection from the fuel to the ambience, which is quantitatively validated by the analytical calculation based on the Arrhenius-type correlation.

Suggested Citation

  • Chen, Haiyan & Shi, Zhongjie & Liu, Fushui & Wu, Yue & Li, Yikai, 2022. "Non-monotonic change of ignition delay with injection pressure under low ambient temperature for the diesel spray combustion," Energy, Elsevier, vol. 243(C).
    • Handle: RePEc:eee:energy:v:243:y:2022:i:c:s0360544221032667
    DOI: 10.1016/j.energy.2021.123017
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    References listed on IDEAS

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    1. Shi, Zhicheng & Lee, Chia-fon & Wu, Han & Wu, Yang & Zhang, Lu & Liu, Fushui, 2019. "Optical diagnostics of low-temperature ignition and combustion characteristics of diesel/kerosene blends under cold-start conditions," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
    2. Shi, Zhicheng & Lee, Chia-fon & Wu, Han & Li, Haiying & Wu, Yang & Zhang, Lu & Bo, Yaqing & Liu, Fushui, 2020. "Effect of injection pressure on the impinging spray and ignition characteristics of the heavy-duty diesel engine under low-temperature conditions," Applied Energy, Elsevier, vol. 262(C).
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