An experimental study on particle number, micromorphology and nanostructure characteristics of particulate matter from a China Ⅵ gasoline direct injection engine

IF 3.8 Q2 ENVIRONMENTAL SCIENCES Atmospheric Environment: X Pub Date : 2023-04-01 DOI:10.1016/j.aeaoa.2023.100211
Zhiyuan Hu, Yang Xu, Zizhou Wang, Haochen Zhang, Piqiang Tan, Diming Lou
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引用次数: 1

Abstract

This study investigated the variation of particle number (PN), morphological features and nano structural parameters of particulate matter (PM) from a China Ⅵ GDI engine under different working conditions, oxidation temperatures, and aerodynamic diameters. The results showed that, particles with a diameter less than 10 nm or 23 nm accounted for 40–65% and 68–94% of total PN respectively. Engine speed has a larger effect on PN emissions with the diameter less than 10 nm. PM emitted from the GDI engine were mainly consisted of primary particles with a diameter of 12–72 nm. Primary particles were composed of numerous graphite fringes with a length of 0.1–1.8 nm, tortuosity of 1.10–2.65, and separation distance of 0.2–1.6 nm. The boundaries of primary particles became vague, the fringe tortuosity and separation distance decreased with the progress of oxidation. Particles in larger aerodynamic diameters were more likely to form cluster-like PM in micromorphology. PM accumulated by particles with an aerodynamic diameter of 52.1 nm had larger fractal dimension, smaller fringe length, higher fringe tortuosity, and greater fringe separation distance, and was more easily be oxidized.

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国产Ⅵ汽油直喷发动机颗粒物颗粒数、微观形貌及纳米结构特性的实验研究
研究了中国Ⅵ直喷发动机在不同工况、氧化温度和气动直径下颗粒物(PM)的颗粒数、形态特征和纳米结构参数的变化规律。结果表明,直径小于10 nm和23 nm的颗粒分别占总PN的40-65%和68-94%。当直径小于10 nm时,发动机转速对PN排放的影响较大。GDI发动机排放的PM主要由直径为12 ~ 72 nm的初级颗粒组成。初级颗粒由大量石墨条纹组成,其长度为0.1 ~ 1.8 nm,弯曲度为1.10 ~ 2.65,分离距离为0.2 ~ 1.6 nm。随着氧化的进行,初级颗粒的边界变得模糊,条纹弯曲度和分离距离减小。在微观形貌上,较大气动直径的颗粒更容易形成团簇状的PM。空气动力学直径为52.1 nm的颗粒所累积的PM具有较大的分形维数、较小的条纹长度、较大的条纹扭曲度和较大的条纹分离距离,并且更容易被氧化。
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来源期刊
Atmospheric Environment: X
Atmospheric Environment: X Environmental Science-Environmental Science (all)
CiteScore
8.00
自引率
0.00%
发文量
47
审稿时长
12 weeks
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