Mengxia Sun , Fang Wang , Yukun Chen , Xueqin Liao , Jianzhong Liu
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引用次数: 0
Abstract
The oxygen content is a key factor influencing the ignition and combustion performance of AlH3 particles. This study investigated the thermal decomposition and oxidation characteristics of AlH3 under different oxygen concentrations using thermogravimetric analysis and differential scanning calorimetry. A tube furnace was used to collect reaction products at various temperatures, and their microstructures and crystal transformations were analyzed to explore the hydrogen release and oxidation mechanisms. Additionally, a settling furnace ignition experimental system was established to study the combustion characteristics and flame morphology of single AlH3 particles under different oxygen content. The thermogravimetric results indicated that the thermal decomposition and oxidation reactions of AlH3 under different oxygen concentrations could be divided into one weight loss stage and two weight gain stages. Although the amount and rate of reaction varied among the stages, there was little difference in the degree of oxidation at 1200 °C. The oxidation layer undergoes phase transformations from amorphous Al2O3 to γ-Al2O3 and finally to α-Al2O3, with needle-like structures appearing at 1000 °C. The combustion results showed that when the oxygen concentration is high, particles are prone to micro explosions. Simultaneously observed phenomena such as diffusion flames, growth of oxidation caps, and gas emission. The combustion time of AlH3 was found to be slightly lower than the empirical values for aluminum, and the ignition delay time was also lower compared to aluminum. Both the ignition delay time and combustion time of the particles decreased with increasing environmental oxygen content.
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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;
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Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including:
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Instabilities and swirl;
Flame spread;
Multi-phase reactants.
Advances in diagnostic and computational methods in combustion, including:
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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.
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