Probing the combustion characteristics of micron-sized aluminum particles enhanced with graphene fluoride

IF 5.8 2区工程技术 Q2 ENERGY & FUELS Combustion and Flame Pub Date : 2024-11-18 DOI:10.1016/j.combustflame.2024.113858

Siyi Zhang , Jingxuan Li , Yu Tian , Shen Fang , Chao Li , Xilong Yu , Yue Jiang , Lijun Yang

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Abstract

Graphene fluoride (GF) with its two-dimensional structure and high fluorine content on the surface can be used to enhance the combustion characteristics of micron-sized Aluminum (μAl) particles. However, the enhancing mechanisms of GF in Al combustion remain not fully understood. In this work, the effects of GF on combustion temperature, flame emission spectrum, ignition delay time, and condensed combustion products (CCPs) size of μAl were studied using laser ignition and optical diagnostic experiments. The combustion characteristics of GF- or polytetrafluoroethylene (PTFE)-modified μAl composite particles were compared to elucidate the ignition and combustion mechanism of different fluorides. The results show that the thermal decomposition behavior and the energy distribution among excited Al atoms differ significantly between GF and PTFE. Compared with PTFE, GF and its decomposition products have stronger excitation ability for high energy Al atoms, which is conducive to increasing the combustion temperature of particle flame. In addition, the ignition delay time and CCPs size of Al/GF are approximately 49∼66 % and 10 % less than those of Al/PTFE, respectively. These results provide a fundamental understanding and data support for the application of functionalized graphene in metal fuels and solid propellants.

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探究使用氟化石墨烯增强的微米级铝颗粒的燃烧特性

氟化石墨烯（GF）具有二维结构，表面含氟量高，可用于增强微米级铝（μAl）颗粒的燃烧特性。然而，GF 在铝燃烧中的增强机理仍未完全清楚。在这项工作中，利用激光点火和光学诊断实验研究了 GF 对μAl 的燃烧温度、火焰发射光谱、点火延迟时间和凝聚燃烧产物（CCPs）尺寸的影响。比较了 GF 或聚四氟乙烯（PTFE）改性μAl 复合颗粒的燃烧特性，以阐明不同氟化物的点火和燃烧机理。结果表明，GF 和 PTFE 的热分解行为和激发的 Al 原子间的能量分布存在显著差异。与聚四氟乙烯相比，GF 及其分解产物对高能铝原子的激发能力更强，有利于提高粒子火焰的燃烧温度。此外，Al/GF 的点火延迟时间和 CCPs 尺寸分别比 Al/PTFE 少约 49%∼66% 和 10%。这些结果为功能化石墨烯在金属燃料和固体推进剂中的应用提供了基础认识和数据支持。

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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.