...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Influence of ethanol blending ratios on in-flame soot particle structures in an optical spark-ignition direct-injection engine
【24h】

Influence of ethanol blending ratios on in-flame soot particle structures in an optical spark-ignition direct-injection engine

机译：乙醇混合比对光学火花点火直喷发动机中的火焰烟灰颗粒结构的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This study shows how ethanol addition impacts in-flame and exhaust soot in spark-ignition direct injection (SIDI) engines through direct and simultaneous sampling of particles from the flames and exhaust stream. The thermophoresis-based soot sampling and transmission electron microscope (TEM) imaging was performed for various ethanol blending ratios ranging from 0 to 60%. A quantitative analysis is performed in the images obtained from a standard TEM by yielding the in-flame and exhaust soot number counts, projection area, as well as morphological parameters such as soot primary particle diameter, aggregate radius of gyration, and fractal dimension. In addition, the internal structures and reactivity status of in-flame and exhaust soot particles are unveiled using a high-resolution TEM with carbon fringe length, tortuosity and fringe-to-fringe separation extracted from processed carbon layer fringe images. The results show that both the number counts and projection areas of exhaust soot are much lower than those of the in-flame soot at any fixed ethanol blending ratios. The exhaust soot is smaller in size for both the primary particles and aggregates with more compact aggregate structures, longer and straighter fringe, and lower fringe separation, all indicating significant soot oxidation occurred inside the cylinder before the particles exit through the exhaust. With increasing ethanol blending ratio, almost linear reduction in number counts and projection area is found for both the in-flame and exhaust soot particles, while both soot aggregates and primary particles become smaller with more stretched aggregate structures and shorter, more curved, and narrower gap fringe structures, indicating soot particles with higher reactivity. The significantly lower soot emissions achieved with higher ethanol blending ratio is found to be due primarily to the suppression of soot formation within the flame as evidenced by higher reduction rate of number counts, projection area, and primary particle and aggregate sizes for the in-flame soot than that of the exhaust soot.
机译：本研究表明，通过直接和同时采样来自火焰和排气流的颗粒，如何在火花点火直喷（SIDI）发动机中产生乙醇的增加。基于蒸煮的烟灰采样和透射电子显微镜（TEM）成像，对各种乙醇混合率的测量值0至60％进行。通过产生风火和排气烟灰数计数，投影区域以及诸如烟灰一次粒径，聚集半径和分形尺寸的形态参数，在从标准TEM获得的图像中进行定量分析。另外，使用高分辨率TEM使用具有碳条纹长度，从加工的碳层条纹图像中提取的碳条纹长度，曲纹和条纹到边缘分离的内部结构和反应性状态揭开了火焰和排气烟灰颗粒。结果表明，排气烟灰的数量计数和投影区域都远低于任何固定乙醇混合比的火焰烟灰。排气烟灰的尺寸较小，初级颗粒和聚集体具有更紧凑的聚集体结构，较长和直流的边缘，并且较低的条纹分离，所有指示颗粒在颗粒通过排气前发生的汽缸内发生了显着的烟灰氧化。随着乙醇共混比的增加，对于火焰和排气烟灰颗粒，发现数量计数和投影区域的几乎线性减少，而烟灰聚集体和初级颗粒都具有更拉伸的聚集体结构和更短，更弯曲和更窄间隙条纹结构，表明具有更高反应性的烟灰颗粒。发现具有较高乙醇混合比的显着较低的烟灰排放主要是由于抑制火焰内的烟雾形成，如较高的数量计数，投影区域和初级粒子和料中的初级粒子和骨料尺寸的更高减少烟灰比排气烟灰。

著录项

  • 来源
    《Fuel》 |2019年第jul15期|16-26|共11页
  • 作者

    Gao Yi; Kim Dongchan; Zhang YiLong; Kook Sanghoon; Xu Min;

  • 作者单位

    Shanghai Jiao Tong Univ Dept Mech Engn Shanghai Peoples R China;

    Univ New South Wales Sch Mech & Mfg Engn Sydney NSW Australia;

    Univ New South Wales Sch Mech & Mfg Engn Sydney NSW Australia;

    Univ New South Wales Sch Mech & Mfg Engn Sydney NSW Australia;

    Shanghai Jiao Tong Univ Dept Mech Engn Shanghai 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

    Ethanol; Petrol; Soot particles; Direct injection;

    机译：乙醇;汽油;烟灰粒子;直接注射;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号