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Effects of GDI injector deposits on spray and combustion characteristics under different injection conditions

机译：GDI喷射器沉积对不同注射条件下喷雾和燃烧特性的影响

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摘要

Injector deposits, which deteriorate the combustion and emissions, are frequent in gasoline direction injection (GDI) engines. An objective of this paper was to investigate the effects of the GDI injector deposits on the spray and combustion characteristics in a constant volume chamber (CVC) and an optical GDI engine, respectively, using different fuel temperature, injection pressure, and injection strategies. The spray and tail droplet characteristics were analyzed by using high-speed imaging. The combustion characteristics involving flame propagation, diffusion flame, and particle emissions were studied in a single-cylinder optical GDI engine. The results showed that the deposits slightly increased the spray penetration at 30 degrees C, and the deposits enhanced the flashboiling process at the fuel temperatures of 60 degrees C and 90 degrees C. The influence of the deposits on flash-boiling was weakened at 20 MPa injection pressure. Compared with the clean injector, the fouled injector had smaller and lower speed tail droplets, slightly lower combustion flame speed, and slightly smaller peak in-cylinder pressure. Moreover, the fouled injector had much more tip diffusion flame compared with the clean injector. The split injection strategy increased the tip diffusion flame and soot emission for both injectors at a fuel temperature of 90 degrees C. The diffusion flame luminance was linear with the number concentration of accumulation mode particles, and the luminance of the diffusion flame can characterize the soot concentration. The tip diffusion flame caused by the deposits is the primary source of soot emission at a fuel temperature of 90 degrees C.
机译：燃烧和排放劣化的喷射器沉积物在汽油方向注射（GDI）发动机中频繁。本文的目的是研究GDI喷射器沉积物的影响，分别使用不同的燃料温度，注射压力和注射策略分别研究恒定容积室（CVC）和光学GDI发动机中的喷雾和燃烧特性。通过使用高速成像分析喷雾和尾液滴特性。在单缸光学GDI发动机中研究了涉及火焰传播，扩散火焰和颗粒排放的燃烧特性。结果表明，沉积物在30℃下略微增加喷雾渗透，并且沉积物在60℃和90℃的燃料温度下增强了闪燃过程。沉积物对闪蒸的影响在20MPa下削弱注射压力。与清洁喷射器相比，污垢喷射器具有较小且较低的尾部液滴，燃烧火焰速度略低，圆柱形压力略微较小。此外，与清洁喷射器相比，污垢喷射器具有更大的尖端扩散火焰。分流注射策略增加了在90℃的燃料温度下的喷射器的尖端扩散火焰和烟灰发射。扩散火焰亮度与积聚模式颗粒的数量浓度线性，并且扩散火焰的亮度可以表征烟尘专注。由沉积物引起的尖端扩散火焰是燃料温度为90℃的烟灰发射的主要来源。

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  • 来源
    《Fuel》 |2020年第15期|118094.1-118094.20|共20页
  • 作者

    Zhang Zhou; Zhang Wenbin; Ma Xiao; Awad Omar I.; Xu Hongming; Shuai Shijin;

  • 作者单位

    Tsinghua Univ State Key Lab Automot Safety & Energy Beijing 100084 Peoples R China;

    Tsinghua Univ State Key Lab Automot Safety & Energy Beijing 100084 Peoples R China;

    Tsinghua Univ State Key Lab Automot Safety & Energy Beijing 100084 Peoples R China;

    Tsinghua Univ State Key Lab Automot Safety & Energy Beijing 100084 Peoples R China;

    Tsinghua Univ State Key Lab Automot Safety & Energy Beijing 100084 Peoples R China|Univ Birmingham Birmingham B15 2TT W Midlands England;

    Tsinghua Univ State Key Lab Automot Safety & Energy Beijing 100084 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

    GDI engine; Injector deposits; Flash-boiling; Diffusion flame; Soot emission;

    机译：GDI发动机;喷射器沉积物;闪蒸;扩散火焰;烟灰排放;

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