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Optical investigation on impacts of ambient pressure on macroscopic spray characteristics of ducted fuel injection under non-vaporizing conditions

机译：环境压力对非汽化条件下管道燃料喷射宏观喷射特性的影响

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摘要

Ducted fuel injection (DFI) which mimics Bunsen burner, is a cutting-edge technology for reducing the soot formation of heavy-duty diesel engines. In this work, the Mie-scattering optical method was used to visualise impacts of ambient gas pressure on DFI and free spray characteristics with a single-hole injector. Ambient gas pressure varies from 3 to 12 MPa and diesel injection pressure from 40 to 120 MPa. Spray morphology, tip penetration, cone angle and area were discussed. The results indicated that DFI spray has a distinct velocity advantage over free spray, especially under high ambient pressure. As ambient pressure increases, DFI spray has better cone angle and area advantages than those of free spray. Increasing injection pressure helps to promote these advantages. Additionally, when the ambient pressure is high enough, a mushroom-shaped spray appeared at the duct outlet, diffusing actively around and forming a large-scale vortex. All of these characteristics of DFI spray can be interpreted as better serving the fuel-gas mixing as ambient pressure increases.
机译：模仿Bunsen燃烧器的管道燃料喷射（DFI）是一种用于减少重型柴油发动机的烟灰形成的尖端技术。在这项工作中，MIE散射光学方法用于可视化环境气体压力对DFI和自由喷射特性的影响，以及单孔喷射器。环境气体压力从3至12MPa和柴油注射压力的40至120MPa变化。讨论喷雾形态，尖端渗透，锥角和面积。结果表明，DFI喷雾具有超出自由喷雾的速度优势，尤其是在高环境压力下。随着环境压力的增加，DFI喷雾具有比自由喷涂更好的锥角和区域优势。增加的注射压力有助于促进这些优点。另外，当环境压力足够高时，导管出口处出现蘑菇形喷雾，主动扩散并形成大规模的涡旋。所有这些DFI喷雾的特性都可以解释为更好地为环境压力增加提供燃料气体混合。

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  • 来源
    《Fuel》 |2020年第may15期|117192.1-117192.17|共17页
  • 作者

    Li Feng; Lee Chia-fon; Wang Ziman; Liu Fushui; Lu Guoxiang;

  • 作者单位

    Beijing Inst Technol Sch Mech Engn Beijing 100081 Peoples R China;

    Beijing Inst Technol Sch Mech Engn Beijing 100081 Peoples R China|Univ Illinois Dept Mech Sci & Engn Urbana IL 61801 USA;

    Beijing Inst Technol Sch Mech Engn Beijing 100081 Peoples R China;

    Beijing Inst Technol Sch Mech Engn Beijing 100081 Peoples R China;

    BYD Auto Ind Co Ltd 3009 BYD Rd Shenzhen 518118 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ducted fuel injection; Diesel spray; Ambient pressure;

    机译：管燃料喷射;柴油喷雾;环境压力;

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