Macrostructure and ultraviolet chemiluminescence of NH3/H2/Air swirling micromix flames

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-04-10 DOI:10.1016/j.combustflame.2025.114170

Can Cao , Linyao Zhang , Chang Xing , Li Liu , Penghua Qiu , Shaozeng Sun

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引用次数: 0

Abstract

This study investigates the macrostructure and ultraviolet chemiluminescence of NH₃/H₂/Air flames using a novel single-nozzle micromix swirl burner at relatively wide ranges of hydrogen mixing ratio (30 %≤X_H2≤70 %) and equivalence ratio (0.4≤φ≤1.3). The transition of flame macrostructure and its relationship with the ultraviolet spectrum is revealed in detail. The flame macrostructure transition was observed as the equivalence ratio increased at different hydrogen mixing ratio studied in this work. The chemiluminescence intensity and intensity ratios of selected emission peaks within the wavelength range of 200∼400 nm showed that the Overlap part (275–302 nm) is important for indicating the characteristics of NH₃/H₂/Air micromix flames. The normalized peak height at wavelength of 296 nm in the Overlap part is quite sensitive to the NH₃/H₂ mixing fraction and insensitive to the equivalence ratio, making it a useful indicator for predicting the hydrogen ratio in the NH₃/H₂ mixed fuels. The NO*/Overlap and NH*/Overlap ratios can be used to predict the equivalence ratio of NH₃/H₂/Air micromix flames when the hydrogen ratio is known. Additionally, turning points were found along the chemiluminescence intensity ratio curves (as a function of equivalence ratio), which could well match the critical equivalence ratio for the macrostructure transition from “V” to “M” at different hydrogen ratios.

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NH3/H2/Air旋流微混合火焰的宏观结构和紫外化学发光

在较宽的混氢比（30%≤XH2≤70%）和当量比（0.4≤φ≤1.3）范围内，采用新型单喷嘴微混合旋流燃烧器对NH3/H2/Air火焰的宏观结构和紫外化学发光进行了研究。详细揭示了火焰宏观结构的转变及其与紫外光谱的关系。在不同氢混合比下，火焰宏观结构的转变随等效比的增大而变化。在200 ~ 400 nm波长范围内选取的发射峰的化学发光强度和强度比表明，重叠部分（275 ~ 302 nm）对表征NH3/H2/Air微混合火焰的特征很重要。重叠部分296 nm波长处的归一化峰高对NH3/H2混合分数非常敏感，对等效比不敏感，可作为预测NH3/H2混合燃料中氢比的有效指标。在氢气比已知的情况下，利用NO*/Overlap和NH*/Overlap比值可以预测NH3/H2/Air微混合火焰的等效比。此外，在化学发光强度比曲线上发现了转折点（作为等效比的函数），这与不同氢比下宏观结构从“V”到“M”转变的临界等效比很匹配。

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.