不同锂含量下的铝锂粒子点火动力学研究

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2024-09-24 DOI:10.1016/j.combustflame.2024.113734

Lu Liu , Wenchao Zhang , Weiqiang Xiong , Peijin Liu , Guoqiang He , Wen Ao

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引用次数: 0

摘要

促进铝粉点火被认为是抑制推进剂中铝粉结块和提高燃烧效率的有效方法。本研究利用激光点火技术和高速摄影技术研究了单个铝颗粒和铝锂合金颗粒的点火和燃烧过程。重点比较了微米级金属颗粒直径和铝锂合金颗粒中锂含量对金属颗粒点火和燃烧过程的影响。结果表明，点火延迟时间与金属颗粒直径成正比，与锂含量成反比。对于锂含量为 3.5 % 的铝锂合金颗粒，即使直径接近 300 μm，点火延迟时间也只有 125.5 ms，远小于直径为 208 μm 的纯铝颗粒。铝粒子和铝锂合金粒子相比，在燃烧阶段两者基本没有差别。然而，在点火阶段，铝锂合金颗粒依次呈现出与锂相对应的红色气相火焰和与铝相对应的黄色气相火焰。这表明，在铝锂合金颗粒的点火过程中，锂首先与氧化气氛发生反应并释放热量，为随后铝颗粒的点火提供热源。这也解释了为什么金属颗粒的点火延迟时间与锂含量成反比。该模型进一步考虑了锂与氧化性气体之间的化学反应，使其适用于铝锂合金颗粒。该点火模型有效地描述了颗粒直径和锂含量对金属颗粒点火过程的影响。对模型进行了进一步验证，结果表明计算出的点火延迟与实验数据十分吻合。总之，本研究为铝锂合金的点火和燃烧过程提供了更深入的实验和理论见解，研究结果可指导铝锂合金在推进剂中的应用。

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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Investigation of Al-Li particle ignition dynamics with different Li content

Promoting the ignition of aluminum powder is considered an effective method to inhibit the agglomeration of aluminum powder in propellants and enhance combustion efficiency. This study utilizes laser ignition technology and high-speed photography to investigate the ignition and combustion processes of single aluminum particles and aluminum-lithium alloy particles. The focus is on comparing the effects of the diameter of micron-sized metal particles and the lithium content in aluminum-lithium alloy particles on the ignition and combustion processes of metal particles. The results show that the ignition delay time is directly proportional to the diameter of the metal particles and inversely proportional to the lithium content. For the aluminum-lithium alloy particle with a lithium content of 3.5 %, even if the diameter is close to 300 μm, the ignition delay time is only 125.5 ms, which is much smaller than that of the pure aluminum particle with a diameter of 208 μm. Compared to aluminum particles and aluminum-lithium alloy particles, there is basically no difference between the two during the combustion stage. However, in the ignition stage, aluminum-lithium alloy particles sequentially exhibit a red gas-phase flame corresponding to lithium and a yellow gas-phase flame corresponding to aluminum. This indicates that during the ignition process of aluminum-lithium alloy particles, lithium first reacts with the oxidative atmosphere and releases heat, providing a heat source for the subsequent ignition of aluminum particles. This also explains why the ignition delay time of metal particles is inversely proportional to the lithium content. An ignition model for aluminum particles in a multi-component atmosphere is established, which further considers the chemical reactions between lithium and oxidative gases, making the model applicable to aluminum-lithium alloy particles. This ignition model effectively describes the impact of particle diameter and lithium content on the ignition process of metal particles. The model is further verified, and the results show that the calculated ignition delay is in good agreement with the experimental data. Overall, this study provides deeper experimental and theoretical insights into the ignition and combustion processes of aluminum-lithium alloys, and the findings can guide the application of aluminum-lithium alloys in propellants.

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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.