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Experimental investigation on the combustion characteristics of aluminum in air

机译：空气中铝燃烧特性的实验研究

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摘要

With the aim of revealing the detailed process of aluminum combustion in air, this paper reports an experimental study on the combustion of aluminum droplets. In this work, the aluminum wires were exposed and heated by a CO2 laser to produce aluminum droplets, and then these droplets were ignited and burnt in air. The changing processes of aluminum wires, droplets and flames were directly recorded by a high-speed camera, which was equipped with a high magnification zoom lens. Meanwhile, the spectrum distribution of the flame was also registered by an optical spectrometer. Besides, burning residuals were collected and analyzed by the methods of Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometer (EDS). Experimental results show that, during combustion, the aluminum droplet is covered by a spherical vapor-phase flame, and the diameter of this flame is about 1.4 times of the droplet diameter, statistically. In the later stages of combustion, the molten aluminum and condensed oxide products can react to generate gaseous Al and Al2O spontaneously. Little holes are found on the surface of residuals, which are the transport channels of gaseous products, namely the gaseous Al and Al2O. The combustion residuals are consisted by lots of aluminum oxide particles with diameters less than 1 mu m. 2016 IAA. (C) Published by Elsevier Ltd. All rights reserved.
机译：为了揭示铝在空气中燃烧的详细过程，本文报道了铝液滴燃烧的实验研究。在这项工作中，将铝线暴露出来并用CO2激光加热以产生铝滴，然后点燃这些滴并在空气中燃烧。铝线，飞沫和火焰的变化过程通过配备了高倍变焦镜头的高速相机直接记录。同时，火焰的光谱分布也通过光谱仪记录。此外，通过扫描电子显微镜（SEM）和能量色散谱仪（EDS）的方法收集并分析了燃烧残留物。实验结果表明，在燃烧过程中，铝液滴被球形汽相火焰覆盖，并且该火焰的直径统计上约为液滴直径的1.4倍。在燃烧的后期，熔融铝和冷凝的氧化物产物会发生反应，自发生成气态Al和Al2O。在残留物表面上发现了一些小孔，这些残留物是气态产物（即气态Al和Al2O）的传输通道。燃烧残余物由许多直径小于1微米的氧化铝颗粒组成。 2016 IAA。 （C）由Elsevier Ltd.出版。保留所有权利。

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  • 来源
    《Acta astronautica》 |2016年第12期|1-7|共7页
  • 作者

    Feng Yunchao; Xia Zhixun; Huang Liya; Yan Xiaoting;

  • 作者单位

    Natl Univ Def Technol, Coll Aerosp Sci & Engn, Changsha 410073, Hunan, Peoples R China;

    Natl Univ Def Technol, Coll Aerosp Sci & Engn, Changsha 410073, Hunan, Peoples R China;

    Natl Univ Def Technol, Coll Aerosp Sci & Engn, Changsha 410073, Hunan, Peoples R China;

    Natl Univ Def Technol, Coll Aerosp Sci & Engn, Changsha 410073, Hunan, 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

    Aluminum droplet; Combustion; Oxide cap; Oxide bubble; CO2 laser; Ducted rocket;

    机译：铝滴;燃烧;氧化帽;氧化气泡;CO2激光;导管火箭;

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