Experimental observation of ethanol–air premixed flames propagating inside a closed tube with high aspect ratio

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dc.contributor.authorSerra, Aguinaldo M.
dc.contributor.authorAndrade, José C.
dc.contributor.authorSilva, Lucas M. [UNESP]
dc.contributor.authorSantos, José C.
dc.contributor.authorSilveira, Julia C.
dc.contributor.authorde Carvalho, João A. [UNESP]
dc.contributor.authorMendiburu, Andrés Z.
dc.contributor.institutionNational Space Research Institute (INPE)
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionFederal University of Rio Grande do Sul (UFRGS)
dc.contributor.institutionInternational Research Group for Energy Sustainability (IRGES)
dc.date.accessioned2023-07-29T13:38:51Z
dc.date.available2023-07-29T13:38:51Z
dc.date.issued2023-02-01
dc.description.abstractThe 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.en
dc.description.affiliationCombustion and Propulsion Laboratory National Space Research Institute (INPE), Rod. Pres. Dutra, km 39, SP
dc.description.affiliationDepartment of Chemistry and Energy School of Engineering São Paulo University (UNESP), Guaratinguetá, Av. Ariberto P. da Cunha, 333, SP
dc.description.affiliationDepartment of Mechanical Engineering Federal University of Rio Grande do Sul (UFRGS), R. Sarmento Leite 425, RS
dc.description.affiliationInternational Research Group for Energy Sustainability (IRGES), R. Sarmento Leite 425, RS
dc.description.affiliationUnespDepartment of Chemistry and Energy School of Engineering São Paulo University (UNESP), Guaratinguetá, Av. Ariberto P. da Cunha, 333, SP
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado do Rio Grande do Sul
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdFAPESP: 2015/23351-9
dc.description.sponsorshipIdFAPESP: 2015/25435-5
dc.description.sponsorshipIdFundação de Amparo à Pesquisa do Estado do Rio Grande do Sul: 21/2551-0000677-3
dc.description.sponsorshipIdCNPq: 423369/2018-0
dc.identifierhttp://dx.doi.org/10.1007/s40430-022-04006-8
dc.identifier.citationJournal of the Brazilian Society of Mechanical Sciences and Engineering, v. 45, n. 2, 2023.
dc.identifier.doi10.1007/s40430-022-04006-8
dc.identifier.issn1806-3691
dc.identifier.issn1678-5878
dc.identifier.scopus2-s2.0-85146763437
dc.identifier.urihttp://hdl.handle.net/11449/248254
dc.language.isoeng
dc.relation.ispartofJournal of the Brazilian Society of Mechanical Sciences and Engineering
dc.sourceScopus
dc.subjectClosed tubes
dc.subjectDeflagrations
dc.subjectEthanol
dc.subjectFlame front inversion
dc.titleExperimental observation of ethanol–air premixed flames propagating inside a closed tube with high aspect ratioen
dc.typeArtigo
unesp.author.orcid0000-0003-4733-625X[7]

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Artigos - Física e Química - FEG