Experimental observation of ethanol–air premixed flames propagating inside a closed tube with high aspect ratio
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1007/s40430-022-04006-8 http://hdl.handle.net/11449/248254 |
Resumo: | The present article aims to experimentally observe the flame propagation of ethanol–air mixtures in a tube closed at both ends with an aspect ratio of 27.68. The mixtures were prepared with equivalence ratios ranging from 0.8 to 1.1. The tests were performed for initial pressures of 20, 40, and 60 kPa. The phenomenon of flame front inversion was observed in all experiments. This phenomenon is also known as tulip flame. It was also observed that the flame front inverted several times at the equivalence ratios of 1.0 and 1.1. After the initial deceleration, the velocity oscillated with a high amplitude at these equivalence ratios. An analysis of the available experimental data was performed to better understand the conditions that allow the flame velocity oscillations to occur. It was found that these oscillations manifest when the following conditions are met: (a) closed channels, (b) sufficiently high laminar flame velocity and (c) sufficiently high aspect ratio. Moreover, this phenomenon is coupled with pressure waves that develop inside the duct. The relationship between the distance for the formation of the flattened flame front and the laminar flame velocity was used to define a characteristic time that correlates with the available experimental data. |
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Repositório Institucional da UNESP |
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Experimental observation of ethanol–air premixed flames propagating inside a closed tube with high aspect ratioClosed tubesDeflagrationsEthanolFlame front inversionThe present article aims to experimentally observe the flame propagation of ethanol–air mixtures in a tube closed at both ends with an aspect ratio of 27.68. The mixtures were prepared with equivalence ratios ranging from 0.8 to 1.1. The tests were performed for initial pressures of 20, 40, and 60 kPa. The phenomenon of flame front inversion was observed in all experiments. This phenomenon is also known as tulip flame. It was also observed that the flame front inverted several times at the equivalence ratios of 1.0 and 1.1. After the initial deceleration, the velocity oscillated with a high amplitude at these equivalence ratios. An analysis of the available experimental data was performed to better understand the conditions that allow the flame velocity oscillations to occur. It was found that these oscillations manifest when the following conditions are met: (a) closed channels, (b) sufficiently high laminar flame velocity and (c) sufficiently high aspect ratio. Moreover, this phenomenon is coupled with pressure waves that develop inside the duct. The relationship between the distance for the formation of the flattened flame front and the laminar flame velocity was used to define a characteristic time that correlates with the available experimental data.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado do Rio Grande do SulConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Combustion and Propulsion Laboratory National Space Research Institute (INPE), Rod. Pres. Dutra, km 39, SPDepartment of Chemistry and Energy School of Engineering São Paulo University (UNESP), Guaratinguetá, Av. Ariberto P. da Cunha, 333, SPDepartment of Mechanical Engineering Federal University of Rio Grande do Sul (UFRGS), R. Sarmento Leite 425, RSInternational Research Group for Energy Sustainability (IRGES), R. Sarmento Leite 425, RSDepartment of Chemistry and Energy School of Engineering São Paulo University (UNESP), Guaratinguetá, Av. Ariberto P. da Cunha, 333, SPFAPESP: 2015/23351-9FAPESP: 2015/25435-5Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul: 21/2551-0000677-3CNPq: 423369/2018-0National Space Research Institute (INPE)Universidade Estadual Paulista (UNESP)Federal University of Rio Grande do Sul (UFRGS)International Research Group for Energy Sustainability (IRGES)Serra, Aguinaldo M.Andrade, José C.Silva, Lucas M. [UNESP]Santos, José C.Silveira, Julia C.de Carvalho, João A. [UNESP]Mendiburu, Andrés Z.2023-07-29T13:38:51Z2023-07-29T13:38:51Z2023-02-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1007/s40430-022-04006-8Journal of the Brazilian Society of Mechanical Sciences and Engineering, v. 45, n. 2, 2023.1806-36911678-5878http://hdl.handle.net/11449/24825410.1007/s40430-022-04006-82-s2.0-85146763437Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of the Brazilian Society of Mechanical Sciences and Engineeringinfo:eu-repo/semantics/openAccess2023-07-29T13:38:51Zoai:repositorio.unesp.br:11449/248254Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-07-29T13:38:51Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Experimental observation of ethanol–air premixed flames propagating inside a closed tube with high aspect ratio |
title |
Experimental observation of ethanol–air premixed flames propagating inside a closed tube with high aspect ratio |
spellingShingle |
Experimental observation of ethanol–air premixed flames propagating inside a closed tube with high aspect ratio Serra, Aguinaldo M. Closed tubes Deflagrations Ethanol Flame front inversion |
title_short |
Experimental observation of ethanol–air premixed flames propagating inside a closed tube with high aspect ratio |
title_full |
Experimental observation of ethanol–air premixed flames propagating inside a closed tube with high aspect ratio |
title_fullStr |
Experimental observation of ethanol–air premixed flames propagating inside a closed tube with high aspect ratio |
title_full_unstemmed |
Experimental observation of ethanol–air premixed flames propagating inside a closed tube with high aspect ratio |
title_sort |
Experimental observation of ethanol–air premixed flames propagating inside a closed tube with high aspect ratio |
author |
Serra, Aguinaldo M. |
author_facet |
Serra, Aguinaldo M. Andrade, José C. Silva, Lucas M. [UNESP] Santos, José C. Silveira, Julia C. de Carvalho, João A. [UNESP] Mendiburu, Andrés Z. |
author_role |
author |
author2 |
Andrade, José C. Silva, Lucas M. [UNESP] Santos, José C. Silveira, Julia C. de Carvalho, João A. [UNESP] Mendiburu, Andrés Z. |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
National Space Research Institute (INPE) Universidade Estadual Paulista (UNESP) Federal University of Rio Grande do Sul (UFRGS) International Research Group for Energy Sustainability (IRGES) |
dc.contributor.author.fl_str_mv |
Serra, Aguinaldo M. Andrade, José C. Silva, Lucas M. [UNESP] Santos, José C. Silveira, Julia C. de Carvalho, João A. [UNESP] Mendiburu, Andrés Z. |
dc.subject.por.fl_str_mv |
Closed tubes Deflagrations Ethanol Flame front inversion |
topic |
Closed tubes Deflagrations Ethanol Flame front inversion |
description |
The present article aims to experimentally observe the flame propagation of ethanol–air mixtures in a tube closed at both ends with an aspect ratio of 27.68. The mixtures were prepared with equivalence ratios ranging from 0.8 to 1.1. The tests were performed for initial pressures of 20, 40, and 60 kPa. The phenomenon of flame front inversion was observed in all experiments. This phenomenon is also known as tulip flame. It was also observed that the flame front inverted several times at the equivalence ratios of 1.0 and 1.1. After the initial deceleration, the velocity oscillated with a high amplitude at these equivalence ratios. An analysis of the available experimental data was performed to better understand the conditions that allow the flame velocity oscillations to occur. It was found that these oscillations manifest when the following conditions are met: (a) closed channels, (b) sufficiently high laminar flame velocity and (c) sufficiently high aspect ratio. Moreover, this phenomenon is coupled with pressure waves that develop inside the duct. The relationship between the distance for the formation of the flattened flame front and the laminar flame velocity was used to define a characteristic time that correlates with the available experimental data. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023-07-29T13:38:51Z 2023-07-29T13:38:51Z 2023-02-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1007/s40430-022-04006-8 Journal of the Brazilian Society of Mechanical Sciences and Engineering, v. 45, n. 2, 2023. 1806-3691 1678-5878 http://hdl.handle.net/11449/248254 10.1007/s40430-022-04006-8 2-s2.0-85146763437 |
url |
http://dx.doi.org/10.1007/s40430-022-04006-8 http://hdl.handle.net/11449/248254 |
identifier_str_mv |
Journal of the Brazilian Society of Mechanical Sciences and Engineering, v. 45, n. 2, 2023. 1806-3691 1678-5878 10.1007/s40430-022-04006-8 2-s2.0-85146763437 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of the Brazilian Society of Mechanical Sciences and Engineering |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
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1799964519549632512 |