ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Ignition and combustion characteristics of micro-sized aluminum particles in H2O and O2
Received date: 2023-04-13
Revised date: 2023-05-04
Accepted date: 2023-05-12
Online published: 2023-05-15
Supported by
National Natural Science Foundation of China(52006240);Hunan Provincial Natural Science Foundation(2021JJ30775)
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 fragmentation 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 content can effectively reduce the combustion time of the particles. In weak oxidation environment, the combustion of aluminum particles is concentrated on the surface, and is difficult to burn completely. The surface reaction plays an important role in the combustion process.
Zejun HU , Yunchao FENG , Zhicheng HE , Zhixun XIA , Mingtai LI . Ignition and combustion characteristics of micro-sized aluminum particles in H2O and O2[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(15) : 528866 -528866 . DOI: 10.7527/S1000-6893.2023.28866
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