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汽车安全与节能学报

汽车安全与节能学报 ›› 2023, Vol. 14 ›› Issue (5): 618-627.DOI: 10.3969/j.issn.1674-8484.2023.05.011

• 汽车节能与环保 • 上一篇    下一篇

氨气影响乙烯层流扩散火焰颗粒微观结构的试验研究

钱伟伟1(), 石秀勇1,*(), 李松2, 帅石金3,4   

  1. 1.同济大学汽车学院，上海 201804，中国
    2.华东交通大学机电与车辆工程学院，南昌 330013，中国
    3.清华大学，汽车安全与节能国家重点实验室，北京 100084，中国
    4.清华大学航空发动机研究院，北京 100084，中国
  • 收稿日期:2023-03-14 修回日期:2023-07-15 出版日期:2023-10-31 发布日期:2023-10-31
  • 通讯作者: *石秀勇，副教授。E-mail：shixy@tongji.edu.cn。
  • 作者简介:钱伟伟（1993—），男（汉），山东，博士研究生。E-mail：qianweiwei@tongji.edu.cn。
  • 基金资助:
    汽车安全与节能国家重点实验室开放基金课题(KFY2229)

Experimental study on the effect of ammonia on nanostructure of particulate matters in ethylene laminar diffusion flames

QIAN Weiwei1(), SHI Xiuyong1,*(), LI Song2, SHUAI Shijin3,4   

  1. 1. School of Automotive Studies, Tongji University, Shanghai 201804, China
    2. School of Mechatronics and Vehicle Engineering, East China Jiaotong University, Nanchang 330013, China
    3. State Key Laboratory of Automotive Safety and Energy, School of Vehicle and Mobility, Tsinghua University, Beijing 100084, China
    4. Institute for Aero Engine, Tsinghua University, Beijing 100084, China
  • Received:2023-03-14 Revised:2023-07-15 Online:2023-10-31 Published:2023-10-31

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摘要：

为分析双燃料燃烧下氨气燃烧对所产生颗粒微观结构性质的影响，该文以乙烯和氨气/乙烯层流扩散火焰为研究对象，借助同轴扩散火焰设备和高倍透射电镜，通过探针取样的方法对层流扩散火焰中不同火焰高度（15 mm和30 mm）进行颗粒微观结构性质分析。结果表明：较于乙烯火焰，添加氨气后，火焰着火高度从7 mm上升至12 mm，颗粒形貌呈现葡萄状或者链状的团聚体结构；在火焰高度15 mm处，团聚体的分形维数由1.85增加至2.15左右，上升约16.2%，颗粒物堆叠程度增大；团聚体由数十至数百个基本碳粒子组成，平均直径分布在20~25 nm，使用氨气后，基本碳粒子平均直径增大约6%，同时其微晶间距减小，微晶长度增大，曲率减小，颗粒物更加稳定。

关键词: 双燃料燃烧, 乙烯/氨气, 层流扩散火焰, 颗粒物, 微观结构性质

Abstract:

To analyze the influence of ammonia on the nanostructure of particulate matters (PMs) under dual-fuel combustion conditions, the laminar diffusion flame of ethylene and ammonia/ethylene was studied by using the diffusion flame equipment and the high-resolution transmission electron microscope. The morphology and nanostructure properties of PMs of different flame heights (15 mm and 30 mm) in laminar diffusion flame were analyzed by probe sampling method. The results show that the lift-off height increases with the addition of ammonia from 7 mm to 12 mm in comparation with the ethylene flame; In addition, the morphology of PMs shows a grape-like or chain-like aggregate structure; At the flame height of 15 mm, the addition of ammonia increases the fractal dimension of aggregates from 1.85 to 2.15, by about 16.2%, which means the stacking degree of aggregates increases. Moreover, the aggregate consists of dozens to hundreds of primary particles with an average diameter distribution between 20 nm and 25 nm; The average diameter of primary particles increases by about 6% with the addition of ammonia, while the distance between fringes decreases, the length of fringes increases, the curvature decreases, and the PMs is more stable with the use of ammonia.

Key words: dual-fuel combustion, ethylene/ammonia, laminar diffusion flame, particulate matters, nanostructure properties

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