Ignition and combustion characteristics of single Al-Li alloy fuel microparticles in CO2 atmosphere

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-06-26 DOI:10.1016/j.combustflame.2025.114308

Hehui Yao , Shengji Li , Yanqi Liu , Houye Huang , Fang Wang , Wei Li , Xuefeng Huang

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引用次数: 0

Abstract

Introducing tiny elemental lithium (Li) into aluminum (Al) to form Al-Li alloy has been proved to be a promising potential in substituting for Al in air. However, the ignition and combustion performance of Al-Li in CO₂ atmosphere (as one of main gas products of propellant pyrolysis) has not been investigated. In this work, a comparative study was conducted on the laser-induced ignition and combustion characteristics of individual micron-sized Al-Li alloy (2.5 wt % Li) particles and pure Al fuel particles in CO₂ atmosphere. It was found that the addition of Li prolonged the ignition delay of Al by 116.1 %, which is significantly different with the behavior in air or oxygen atmosphere. The intermediate products during ignition were acquired by accurate quenching technology via controlling the laser operation time to the millisecond level, and its characterization results revealed the presence of Li₂CO₃, indicating that Li in the Al-Li alloy could firstly react with CO₂ to form Li₂CO₃ during ignition, which restricted the expansion of particles and thus prolonged the ignition delay. In comparison to pure Al, the combustion flame propagation of Al-Li in CO₂ atmosphere was constrained, and the micro-explosion performance was mitigated, while there was no significant difference in the combustion temperature on the influence of overall exothermic performance. Finally, the ignition and combustion mechanism of Al-Li alloy in CO₂ was proposed and revealed, through combining with the characteristic analysis of the combustion residues and intermediate products.

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单一Al-Li合金燃料微粒在CO2大气中的点火燃烧特性

在铝（Al）中引入微量元素锂（Li）形成Al-Li合金已被证明是替代空气中Al的一种很有前途的方法。然而，作为推进剂热解的主要气体产物之一，Al-Li在CO2气氛中的点火和燃烧性能尚未得到研究。本文对单个微米级Al-Li合金（2.5 wt % Li）颗粒和纯Al燃料颗粒在CO2大气中的激光诱导点火和燃烧特性进行了比较研究。结果表明，Li的加入使Al的点火延迟时间延长了116.1%，这与Al在空气或氧气气氛中的行为有显著不同。通过精确淬火技术，将激光操作时间控制在毫秒级，获得了点火过程中的中间产物，表征结果显示Li2CO3的存在，说明Al-Li合金中的Li在点火过程中首先与CO2反应生成Li2CO3，限制了颗粒的膨胀，从而延长了点火延迟时间。与纯Al相比，Al- li在CO2气氛中燃烧火焰传播受限，微爆炸性能减弱，而燃烧温度对整体放热性能的影响无显著差异。最后，结合燃烧残渣和中间产物的特性分析，提出并揭示了铝锂合金在CO2中的点火燃烧机理。

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.