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Morphology and nano-structure of soot in diesel spray and in engine exhaust

机译：柴油机喷雾剂和发动机排气中烟灰的形态和纳米结构

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摘要

This work investigates how morphology and nano-structure of the soot particles produced in a diesel spray flame evolve due to the rise in the temperature/pressure caused by the piston motion. The soot particles were sampled from the exhaust line of a diesel engine and were compared to the soot particles directly sampled from the spray flame of the same injector, in a constant volume chamber. Analysis of the high resolution transmission electron microscope (HRTEM) images acquired from the soot samples at two axial locations in the spray flame shows that the soot aggregates grow in size, become longer, more fractal and attain lower surface to volume ratio along the spray axis. However, the soot particles produced in the spray flame become smaller, shorter, less fractal, more compact and attain higher surface to volume ratio when emitted from the engine. This is discussed to be due to the increase in the oxidation rate by temperature rise caused by piston motion, and the consequent oxidation induced fragmentation of the soot aggregates. The effect of oxidation is also evident on the size of the soot primary particles, as the engine-out soot is found to have smaller primary particles compared to the soot initially produced in the spray flame. Nano-structural analysis shows that the crystallite size in the engine-out soot is increased compared to the soot originally produced in the spray flame. This suggests that among two possible effects of temperature on diesel soot crystallite size, being crystallite size increase due to enhanced graphitization from one hand, and crystallite size reduction due to oxidation enhancement from the other hand, the former effect is dominant and the soot particles become structurally more ordered under the effect of temperature rise caused by piston motion. (C) 2017 Elsevier Ltd. All rights reserved.
机译：这项工作研究了由于活塞运动引起的温度/压力升高，柴油机喷射火焰中产生的烟尘颗粒的形态和纳米结构如何演变。在恒定容积室内，从柴油发动机的排气管路中采样烟灰颗粒，并将其与直接从同一喷油器的喷射火焰中采样的烟灰颗粒进行比较。从喷雾火焰中两个轴向位置的烟灰样品获取的高分辨率透射电子显微镜（HRTEM）图像的分析表明，烟尘聚集体尺寸增大，变长，分形并沿喷雾轴达到较低的体积比。然而，当从发动机排放时，在喷射火焰中产生的烟尘颗粒变得更小，更短，分形更少，更致密并获得更高的表面积体积比。讨论这归因于由于活塞运动引起的温度升高引起的氧化速率的增加，以及随之而来的氧化诱导的烟灰聚集体的破碎。氧化作用对烟灰初级颗粒的尺寸也很明显，因为发现发动机排出的烟灰与最初在喷雾火焰中产生的烟灰相比具有较小的初级颗粒。纳米结构分析表明，与最初在喷雾火焰中产生的烟灰相比，发动机排出的烟灰中的微晶尺寸增加了。这表明温度对柴油机烟灰微晶尺寸的两种可能影响，一方面是由于石墨化增强导致晶粒尺寸增大，另一方面是由于氧化增强导致晶粒尺寸减小，前者的影响最为明显，烟尘颗粒变为在由活塞运动引起的温度升高的影响下，结构更加有序。 （C）2017 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Fuel》 |2017年第1期|47-56|共10页
  • 作者

    Rohani Behzad; Bae Choongsik;

  • 作者单位

    Korea Adv Inst Sci & Technol, Daejeon, South Korea;

    Korea Adv Inst Sci & Technol, Daejeon, South Korea;

  • 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

    Diesel soot; Morphology; Nano-structure; In-spray sampling;

    机译：柴油机烟灰形态纳米结构喷雾内采样;

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