Facilitated hydrogen/air flame propagation using ozone stratification

IF 6.2 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2026-05-01 Epub Date: 2026-02-20 DOI:10.1016/j.combustflame.2026.114861

Chenyu Li , Haiyue Li , Chung K. Law , Wenkai Liang

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引用次数: 0

Abstract

Ozone (O₃), as a strong oxidizer, demonstrates the potential for influencing and controlling flame propagation speed through altered chemical kinetics. In this study, we investigated flame enhancement by compositionally stratified ozone on the oxidizer side for hydrogen (H₂) /air mixtures with

ϕ

=0.6–4.0 and ozone fraction in the oxidant

α_{O_{3}}

=0–10%. Detailed flame dynamics and structure have been systematically analysed through numerical simulation and kinetics analysis. It is shown that, ozone stratification induces a sustaining effect, i.e., the flame remains fast-propagating even when traveling out of the ozone stratification layer and transiting into the ozone-free regime. Such a sustaining effect shows opposite dependences on the ozone concentration for (fuel-)lean and rich conditions, with a crossing point approximately at equivalence ratio

ϕ

=1.5. Furthermore, ozone stratification exerts much stronger influences on flame propagation through chemical effects compared to thermal effects. The reaction of ozone with H radical is of primary importance, contributing to both flame enhancement and the sustaining effect. Preferential diffusion by ozone can facilitate flame propagation under both lean and rich conditions. This study provides insights into optimizing hydrogen combustion applications by ozone stratification.

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利用臭氧分层促进氢/空气火焰传播

臭氧（O3）作为一种强氧化剂，通过改变化学动力学来影响和控制火焰传播速度。在本研究中，我们研究了氧化侧成分分层臭氧对H2 /空气混合物的火焰增强作用，其中φ = 0.6-4.0，臭氧在氧化剂αO3中的分数= 0-10%。通过数值模拟和动力学分析，系统地分析了火焰的动力学和结构。结果表明，臭氧分层引起持续效应，即火焰即使在走出臭氧分层并过渡到无臭氧状态时仍保持快速传播。在（燃料）稀薄和丰富的条件下，这种持续效应对臭氧浓度的依赖性相反，交叉点大约在等效比φ =1.5处。此外，臭氧分层通过化学效应对火焰传播的影响比热效应大得多。臭氧与H自由基的反应是最重要的，有助于火焰的增强和维持效果。臭氧的优先扩散在贫和富条件下都有利于火焰的传播。该研究为臭氧分层优化氢燃烧应用提供了见解。

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.