Study on the instability and NO emission of NH3/O2/N2 laminar flame under O2-enriched conditions

IF 9.2 2区工程技术 Q1 CHEMISTRY, PHYSICAL International Journal of Hydrogen Energy Pub Date : 2025-05-21 Epub Date: 2025-04-25 DOI:10.1016/j.ijhydene.2025.04.379

Wenchao Yang , Guoyan Chen , Haoxin Deng , Jun Song , Tuo Zhou , Xiaoping Wen , Fahui Wang , Chenglong Yu

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Abstract

This study measures the laminar burning velocity (S_L) of NH₃/O₂/N₂ flames with different O₂ enrichment coefficient (Ω) by the constant volume combustion bomb. The flame instability is quantitatively analyzed by linear stability theory, and the effect of Ω on NO formation is analyzed by the mole fraction and production rate. Results indicate that the growth rate of S_L with the increase of Ω is relatively slow at rich burn. Linear stability analysis reveals that hydrodynamic instability persistently affects flame stability with increasing Ω or equivalence ratio, whereas thermal diffusion instability exerts a significant positive effect, which makes the growth rate of disturbance (∑) gradually decrease. The growth rate of NO mole fraction with Ω at lean burn is obviously higher than that at rich burn. Reaction path analysis indicates that O₂ enrichment enhances the importance of the NH₂ → NH → N → N₂ pathway.

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富氧条件下NH3/O2/N2层流火焰的不稳定性及NO排放研究

本文采用定容燃烧弹测量了不同O2富集系数（Ω）的NH3/O2/N2火焰的层流燃烧速度（SL）。用线性稳定性理论定量分析了火焰不稳定性，用摩尔分数和产率分析了Ω对NO生成的影响。结果表明，在丰富燃烧条件下，随着Ω的增加，SL的生长速度相对较慢。线性稳定性分析表明，流体动力不稳定性随Ω或等效比的增大而持续影响火焰稳定性，而热扩散不稳定性则有显著的正向影响，使扰动（∑）的增长率逐渐减小。在贫烧条件下，添加Ω的NO摩尔分数的生长率明显高于富烧条件。反应路径分析表明，O2富集增强了NH2→NH→N→N2途径的重要性。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.