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Numerical and Experimental Study on Flame Dynamics of the Premixed Methane–Air Mixture at Different Ignition Positions in a Two-Side 45° Branch Tube
[Image: see text] The combustion characteristics of premixed methane–air flames in a half-open tube with a two-sided 45° branch structure at different ignition positions were investigated by experiments and large eddy simulations. The numerical results were compared with the experimental results to...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2023
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9878620/ https://www.ncbi.nlm.nih.gov/pubmed/36713713 http://dx.doi.org/10.1021/acsomega.2c05553 |
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author | Xu, Zhuangzhuang Deng, Haoxin Wen, Xiaoping Wang, Fahui Chen, Guoyan Yan, Mengmeng Wei, Shengnan |
author_facet | Xu, Zhuangzhuang Deng, Haoxin Wen, Xiaoping Wang, Fahui Chen, Guoyan Yan, Mengmeng Wei, Shengnan |
author_sort | Xu, Zhuangzhuang |
collection | PubMed |
description | [Image: see text] The combustion characteristics of premixed methane–air flames in a half-open tube with a two-sided 45° branch structure at different ignition positions were investigated by experiments and large eddy simulations. The numerical results were compared with the experimental results to verify the correctness of the model. The results show that the simulation results are highly consistent with the experiment. This study provides a basic understanding of the effects of the branch tube structure and the ignition position on flame dynamics. When the flame propagates to the branch interface, it forms a symmetrical vortex structure at the branch tube with the opposite rotation direction. When the ignition position is at IP0 and IP900, the maximum overpressures obtained in the experiment are 10.1 and 10.7 kPa, respectively, and 9.2 and 10.4 kPa in the simulation, respectively. At IP0, the Karlovitz number indicating the interaction intensity between the flame surface and the turbulence during flame propagation is a maximum of 9.2 and a minimum of 0.04. The premixed flame has a folded small flame, a corrugated small flame, and a thin reaction zone. |
format | Online Article Text |
id | pubmed-9878620 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-98786202023-01-27 Numerical and Experimental Study on Flame Dynamics of the Premixed Methane–Air Mixture at Different Ignition Positions in a Two-Side 45° Branch Tube Xu, Zhuangzhuang Deng, Haoxin Wen, Xiaoping Wang, Fahui Chen, Guoyan Yan, Mengmeng Wei, Shengnan ACS Omega [Image: see text] The combustion characteristics of premixed methane–air flames in a half-open tube with a two-sided 45° branch structure at different ignition positions were investigated by experiments and large eddy simulations. The numerical results were compared with the experimental results to verify the correctness of the model. The results show that the simulation results are highly consistent with the experiment. This study provides a basic understanding of the effects of the branch tube structure and the ignition position on flame dynamics. When the flame propagates to the branch interface, it forms a symmetrical vortex structure at the branch tube with the opposite rotation direction. When the ignition position is at IP0 and IP900, the maximum overpressures obtained in the experiment are 10.1 and 10.7 kPa, respectively, and 9.2 and 10.4 kPa in the simulation, respectively. At IP0, the Karlovitz number indicating the interaction intensity between the flame surface and the turbulence during flame propagation is a maximum of 9.2 and a minimum of 0.04. The premixed flame has a folded small flame, a corrugated small flame, and a thin reaction zone. American Chemical Society 2023-01-11 /pmc/articles/PMC9878620/ /pubmed/36713713 http://dx.doi.org/10.1021/acsomega.2c05553 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Xu, Zhuangzhuang Deng, Haoxin Wen, Xiaoping Wang, Fahui Chen, Guoyan Yan, Mengmeng Wei, Shengnan Numerical and Experimental Study on Flame Dynamics of the Premixed Methane–Air Mixture at Different Ignition Positions in a Two-Side 45° Branch Tube |
title | Numerical and Experimental
Study on Flame Dynamics
of the Premixed Methane–Air Mixture at Different Ignition Positions
in a Two-Side 45° Branch Tube |
title_full | Numerical and Experimental
Study on Flame Dynamics
of the Premixed Methane–Air Mixture at Different Ignition Positions
in a Two-Side 45° Branch Tube |
title_fullStr | Numerical and Experimental
Study on Flame Dynamics
of the Premixed Methane–Air Mixture at Different Ignition Positions
in a Two-Side 45° Branch Tube |
title_full_unstemmed | Numerical and Experimental
Study on Flame Dynamics
of the Premixed Methane–Air Mixture at Different Ignition Positions
in a Two-Side 45° Branch Tube |
title_short | Numerical and Experimental
Study on Flame Dynamics
of the Premixed Methane–Air Mixture at Different Ignition Positions
in a Two-Side 45° Branch Tube |
title_sort | numerical and experimental
study on flame dynamics
of the premixed methane–air mixture at different ignition positions
in a two-side 45° branch tube |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9878620/ https://www.ncbi.nlm.nih.gov/pubmed/36713713 http://dx.doi.org/10.1021/acsomega.2c05553 |
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