Flame structure study of premixed NH3/O2/Ar flames using Raman spectroscopy
(2025) In Combustion and Flame 280.- Abstract
While NH3 has gained a lot of interest as a potential carbon-free fuel, at present, there are notable disagreements when it comes to predictions of some of its combustion characteristics, such as burning velocity or species mole fractions, in particular of NOx, which have the potential to cause significant harm to both human health and the environment. Nevertheless, because the NH3 flame presents multiple challenges for experimental studies, there is a lack of data that could assist with the further development of kinetic models. In the present work, the authors demonstrate enhanced Raman spectroscopy with multiple laser beam passages that allows for non-intrusive sensitive detection and quantification of two... (More)
While NH3 has gained a lot of interest as a potential carbon-free fuel, at present, there are notable disagreements when it comes to predictions of some of its combustion characteristics, such as burning velocity or species mole fractions, in particular of NOx, which have the potential to cause significant harm to both human health and the environment. Nevertheless, because the NH3 flame presents multiple challenges for experimental studies, there is a lack of data that could assist with the further development of kinetic models. In the present work, the authors demonstrate enhanced Raman spectroscopy with multiple laser beam passages that allows for non-intrusive sensitive detection and quantification of two nitrogen oxide species, NO and N2O, in flame with detection limits of 600 and 500 ppm, respectively. All the datasets were acquired in NH3/O2/Ar flames, to only involve NOx reactions from fuel-bound nitrogen, at three equivalence ratios (Φ=0.8, 1.0, 1.2). The processed datasets were compared with predictions of four chemical kinetic mechanisms and possible reasons for disagreements in model predictions were discussed. While overall model performance varies between different flames, most of the models tested give acceptable predictions for the NO profiles, with predictions of all models being on the lower end of the experimental data range for rich flames. For N2O, the obtained peak mole fraction values of 1670 (Φ=0.8), 1060 (Φ=1.0) and 670 (Φ=1.2) ppm have been well reproduced by one of the models within the experimental error margins.
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- author
- Zubairova, Alsu LU ; Chen, Jundie LU ; Konnov, Alexander A. LU and Brackmann, Christian LU
- organization
- publishing date
- 2025-10
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Ammonia, Flame structure, Modeling, Nitrogen oxides, Raman Spectroscopy
- in
- Combustion and Flame
- volume
- 280
- article number
- 114382
- publisher
- Elsevier
- external identifiers
-
- scopus:105011969764
- ISSN
- 0010-2180
- DOI
- 10.1016/j.combustflame.2025.114382
- language
- English
- LU publication?
- yes
- id
- 0af148fc-aefd-4d32-ab48-b359565115de
- date added to LUP
- 2025-11-04 08:39:48
- date last changed
- 2025-11-04 08:39:48
@article{0af148fc-aefd-4d32-ab48-b359565115de,
abstract = {{<p>While NH<sub>3</sub> has gained a lot of interest as a potential carbon-free fuel, at present, there are notable disagreements when it comes to predictions of some of its combustion characteristics, such as burning velocity or species mole fractions, in particular of NOx, which have the potential to cause significant harm to both human health and the environment. Nevertheless, because the NH<sub>3</sub> flame presents multiple challenges for experimental studies, there is a lack of data that could assist with the further development of kinetic models. In the present work, the authors demonstrate enhanced Raman spectroscopy with multiple laser beam passages that allows for non-intrusive sensitive detection and quantification of two nitrogen oxide species, NO and N<sub>2</sub>O, in flame with detection limits of 600 and 500 ppm, respectively. All the datasets were acquired in NH<sub>3</sub>/O<sub>2</sub>/Ar flames, to only involve NOx reactions from fuel-bound nitrogen, at three equivalence ratios (Φ=0.8, 1.0, 1.2). The processed datasets were compared with predictions of four chemical kinetic mechanisms and possible reasons for disagreements in model predictions were discussed. While overall model performance varies between different flames, most of the models tested give acceptable predictions for the NO profiles, with predictions of all models being on the lower end of the experimental data range for rich flames. For N<sub>2</sub>O, the obtained peak mole fraction values of 1670 (Φ=0.8), 1060 (Φ=1.0) and 670 (Φ=1.2) ppm have been well reproduced by one of the models within the experimental error margins.</p>}},
author = {{Zubairova, Alsu and Chen, Jundie and Konnov, Alexander A. and Brackmann, Christian}},
issn = {{0010-2180}},
keywords = {{Ammonia; Flame structure; Modeling; Nitrogen oxides; Raman Spectroscopy}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Combustion and Flame}},
title = {{Flame structure study of premixed NH<sub>3</sub>/O<sub>2</sub>/Ar flames using Raman spectroscopy}},
url = {{http://dx.doi.org/10.1016/j.combustflame.2025.114382}},
doi = {{10.1016/j.combustflame.2025.114382}},
volume = {{280}},
year = {{2025}},
}