Effect of oxygen concentration on thermal oxidation and combustion characteristics of single aluminum particles

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-04-10 DOI:10.1016/j.combustflame.2025.114166

Xueqin Liao , Peihui Xu , Mengxia Sun , Fan Zhang , Jianzhong Liu

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引用次数: 0

Abstract

Aluminum (Al) particles are widely used in propellants, thermite and explosives. However, its energy release process is still not thoroughly investigated. In this paper, the reaction properties of Al particles at low and high heating rates were investigated using a thermal analysis system and a single-particle combustion system, respectively. At a low heating rate (10°C/min), when the temperature is raised to 1200°C, the oxidation efficiency of Al (which can also be regarded as the average oxidation rate) increases first and then decreases as the oxygen concentration increases. In addition, XRD results of intermediate oxidation products under air show that the oxidation of Al particles deepens with increasing temperature. The SEM results reveal that broken particles and large-size aggregates gradually appear in the sample as the temperature increases, and the surface of the Al particles becomes rougher. At high heating rate (combustion), with the increase of oxygen concentration, the probability of microexplosion of Al particles increases from 19.77 % under air to 82.67 % under 100 % O₂. Furthermore, the combustion time gradually decreases with the increase of oxygen concentration, while the average mass burning rate gradually increases from 1.65 g/ms under air to 2.73 g/ms under 100 % O₂. Based on the analysis of the surface structure of the intermediate oxidation products and the microexplosion of single particles, it is believed that the difference of the reaction law of Al particles at different heating rates may be related to the structural evolution behavior of the oxide film. This study provides basic data support for understanding the heat release behavior of Al particles.

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氧浓度对单铝颗粒热氧化燃烧特性的影响

铝（Al）颗粒广泛用于推进剂、铝热剂和炸药中。然而，它的能量释放过程仍未被彻底研究。本文分别利用热分析系统和单颗粒燃烧系统研究了Al颗粒在低加热速率和高加热速率下的反应性质。在低升温速率下（10℃/min），升温至1200℃时，随着氧浓度的增加，Al的氧化效率（也可视为平均氧化率）先升高后降低。另外，空气作用下中间氧化产物的XRD结果表明，随着温度的升高，Al颗粒的氧化程度加深。SEM结果表明，随着温度的升高，试样中逐渐出现破碎颗粒和大团聚体，Al颗粒表面变得粗糙。在高升温速率（燃烧）条件下，随着氧气浓度的增加，Al颗粒的微爆炸概率由空气条件下的19.77%增加到100% O2条件下的82.67%。随着氧气浓度的增加，燃烧时间逐渐减少，平均质量燃烧速率从空气下的1.65 g/ms逐渐增加到100% O2下的2.73 g/ms。通过对中间氧化产物表面结构和单颗粒微爆炸的分析，认为不同升温速率下Al颗粒反应规律的差异可能与氧化膜的结构演化行为有关。本研究为了解铝颗粒的放热行为提供了基础数据支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.