Insight into the inner structure of stretched premixed ammonia-air flames

Article Thermodynamics

Experimental study and numerical validation of oxy-ammonia combustion at elevated temperatures and pressures

Alka Karan et al.

Summary: The study focuses on testing laminar flame speed data for ammonia combustion at elevated conditions, with a literature review and sensitivity analysis conducted.

COMBUSTION AND FLAME (2022)

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Article Thermodynamics

Experimental and Numerical Study of NH3/CH4 Counterflow Premixed and Non-premixed Flames for Various NH3 Mixing Ratios

Sophie Colson et al.

Summary: The study investigated the application of ammonia/methane mixtures in flames and the prediction of extinction stretch rate by different numerical mechanisms. Experimental results showed that all mechanisms struggled to accurately predict the extinction rate in premixed flames, while Okafor’s mechanism performed better in non-premixed flames.

COMBUSTION SCIENCE AND TECHNOLOGY (2021)

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Article Thermodynamics

An investigation of ammonia primary flame combustor concepts for emissions reduction with OH , NH2 and NH * chemiluminescence at elevated conditions

Daniel Pugh et al.

Summary: With the increasing interest in NH3 as a potential energy carrier, combustor designs and fuel concepts need to be optimized to reduce NOx emissions. The introduction of staged combustor concepts has been identified as a way to limit NOx production, improve combustor efficiency, and reduce unburned NH3. The efficacy of secondary air staging is sensitive to primary flame behavior, and while low NOx emissions can be achieved at rich conditions, high unburned NH3 can lead to greater global NOx concentrations.

PROCEEDINGS OF THE COMBUSTION INSTITUTE (2021)

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Article Thermodynamics

NO and OH* emission characteristics of very-lean to stoichiometric ammonia-hydrogen-air swirl flames

Xuren Zhu et al.

Summary: The experimental investigation showed that using ammonia-hydrogen mixtures as fuel under lean conditions can lead to low NO emissions. The intensity of OH* chemiluminescence can serve as a proxy for the NO mole fraction, providing a low-cost technique to evaluate NO emissions from flames fueled with hydrogen-enriched ammonia blends.

PROCEEDINGS OF THE COMBUSTION INSTITUTE (2021)

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Article Energy & Fuels

Structure and Laminar Flame Speed of an Ammonia/Methane/Air Premixed Flame under Varying Pressure and Equivalence Ratio

Rodolfo C. Rocha et al.

Summary: This paper presents a study on premixed laminar ammonia/methane/air flames through experiments and numerical simulations. The research aims to understand flame structures and NO formation, as well as determine the laminar flame speed under various conditions. The findings reveal the effects of pressure, equivalence ratio, and ammonia fraction in the fuel on flame characteristics and NO emissions.

ENERGY & FUELS (2021)

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Article Thermodynamics

Curvature effects on NO formation in wrinkled laminar ammonia/hydrogen/nitrogen-air premixed flames

Corinna Netzer et al.

Summary: The study reveals the impact of flame curvature and preferential diffusion of H2 on local equivalence ratio, which in turn affects NO formation in NH3/H2/N2-air flames. The formation of NO is found to be influenced by local equivalence ratio and radical pools, with differences between H2-depleted and H2-enriched regions of the flame front across a wide range of equivalence ratios.

COMBUSTION AND FLAME (2021)

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Article Energy & Fuels

Methane/Ammonia Radical Formation during High Temperature Reactions in Swirl Burners

Marco Osvaldo Vigueras-Zuniga et al.

Summary: Recent studies have shown that ammonia could potentially serve as an energy carrier to replace natural gas in gas combustion. Research has focused on understanding radical formation during the combustion of ammonia and methane blends.

ENERGIES (2021)

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Article Thermodynamics

A comparison of the blow-out behavior of turbulent premixed ammonia/hydrogen/nitrogen-air and methane-air flames

Samuel Wiseman et al.

Summary: Ammonia, hydrogen, and nitrogen blends show potential as fuel in gas turbines with blow-out velocity higher than methane. Experimental results indicate that ammonia blends have higher heat release rate and lower extinction tendency in high-speed turbulent conditions than methane.

PROCEEDINGS OF THE COMBUSTION INSTITUTE (2021)

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Article Thermodynamics

Chemiluminescence signature of premixed ammonia-methane-air flames

Xuren Zhu et al.

Summary: This paper presents the chemiluminescence characteristics of premixed ammonia-methane-air flames and identifies potential surrogates for flame sensors. The study provides a comprehensive database on chemiluminescence intensity ratios and highlights promising ratios for monitoring flame properties.

COMBUSTION AND FLAME (2021)

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Article Thermodynamics

Plasma assisted ammonia combustion: Simultaneous NOx reduction and flame enhancement

Jinhoon Choe et al.

Summary: This study demonstrates that plasma can reduce NOx emissions and extend the lean blowoff limits of ammonia flames, in contrast to previous research using hydrocarbon fuels. These findings could pave the way for practical application of plasma in ammonia combustion.

COMBUSTION AND FLAME (2021)

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Article Chemistry, Multidisciplinary