Ignition and combustion characteristics of micro-sized aluminum particles in H2O and O2

被引：0
|
作者：
Hu Z. [1 ]
Feng Y. [1 ]
He Z. [1 ]
Xia Z. [1 ]
Li M. [1 ]
机构：
[1] College of Aerospace Science and Technology, National University of Defense Technology, Changsha
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2023年 / 44卷 / 15期
基金：
中国国家自然科学基金;
关键词：
aluminum particles; ignition and combustion; micro-sized single particle; oxygen; water vapor;
D O I：
10.7527/S1000-6893.2023.28866
中图分类号：
学科分类号：
摘要：
The ignition and combustion characteristics of single micro-sized aluminum particles（50-160 μm）in water vapor and different oxygen contents are studied experimentally. The initial diameters and flame average diameters of the aluminum particles are determined by their optical information，and the ignition delay time and combustion time are divided. Different combustion behaviors will occur in the combustion process of aluminum particles. Particle fragmen⁃ tation and injection are more likely to occur in the environment with higher temperature，and micro-explosion is more prevalent in the environment with higher oxygen content. Increasing the ambient temperature or oxygen content can reduce the ignition delay time of the particles，but the higher temperature makes the combustion time of the particles longer，which may be caused by the high temperature alumina taking away a lot of heat. Increasing the oxygen con⁃ tent can effectively reduce the combustion time of the particles. In weak oxidation environment，the combustion of alu⁃ minum particles is concentrated on the surface，and is difficult to burn completely. The surface reaction plays an im⁃ portant role in the combustion process. © 2023 AAAS Press of Chinese Society of Aeronautics and Astronautics. All rights reserved.
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