微米级铝颗粒在水蒸气和氧气中的点火燃烧特性

doi:10.7527/S1000-6893.2023.28866

Abstract

Abstract:

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.

Key words: aluminum particles, micro-sized single particle, ignition and combustion, water vapor, oxygen

CLC Number:

V439

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 Aeronautica et Astronautica Sinica, 2023, 44(15): 528866-528866.

Figures/Tables 13

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Case	H₂流量/SLM	O₂流量/SLM	空气流量/SLM	产物
1	8	4	0	100%H₂O
2	12	6	0	100%H₂O
3	16	8	0	100%H₂O
4	12	3	15	50%H₂O， 50%N₂
5	12	6	12	50%H₂O， 10%O₂
6	12	18	0	50%H₂O， 50%O₂

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

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

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