Characterization of the flame front inversion of Ethanol–Air deflagrations inside A closed tube

Detalhes bibliográficos
Autor(a) principal: Mendiburu, Andrés Z.
Data de Publicação: 2019
Outros Autores: Serra, Aguinaldo M., Andrade, José C., Silva, Lucas M. [UNESP], Santos, José C., de Carvalho, João A. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.energy.2019.115932
http://hdl.handle.net/11449/189523
Resumo: Ethanol–air deflagrations were experimentally studied inside a closed tube by varying the equivalence ratio (0.9–1.4) and the initial pressure (20–60 kPa). The flame front inversion phenomenon was observed in all tests. It was determined that the ratio of the distance of flat flame formation to the hydraulic diameter (df/dh) is a measurable parameter that allows the characterization of the phenomenon. For ethanol–air mixtures two dimensionless parameters can be used to correlate df/dh, namely, the ratio of the laminar flame speed to the speed of sound of the reactants (SL/CS,0) and the dimensionless distance travelled by the flame tip up to the time when the flame touches the lateral walls of the tube (ξtip,wall). Two correlations were obtained and the averages of the absolute values of the relative errors (AARE) were less than 1.2%. Another correlation was obtained considering published data of different fuel–air mixtures. A statistical analysis applied considering experimental data from published literature and from this work, showed an AARE of 8.95% and a coefficient of multiple determination (R2) of 0.79. The p-values of the regression coefficients were lower than 0.001. Therefore, the correlations present good accuracy and can be used for prediction.
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spelling Characterization of the flame front inversion of Ethanol–Air deflagrations inside A closed tubeClosed tubesDeflagrationsEthanolFlame front inversionEthanol–air deflagrations were experimentally studied inside a closed tube by varying the equivalence ratio (0.9–1.4) and the initial pressure (20–60 kPa). The flame front inversion phenomenon was observed in all tests. It was determined that the ratio of the distance of flat flame formation to the hydraulic diameter (df/dh) is a measurable parameter that allows the characterization of the phenomenon. For ethanol–air mixtures two dimensionless parameters can be used to correlate df/dh, namely, the ratio of the laminar flame speed to the speed of sound of the reactants (SL/CS,0) and the dimensionless distance travelled by the flame tip up to the time when the flame touches the lateral walls of the tube (ξtip,wall). Two correlations were obtained and the averages of the absolute values of the relative errors (AARE) were less than 1.2%. Another correlation was obtained considering published data of different fuel–air mixtures. A statistical analysis applied considering experimental data from published literature and from this work, showed an AARE of 8.95% and a coefficient of multiple determination (R2) of 0.79. The p-values of the regression coefficients were lower than 0.001. Therefore, the correlations present good accuracy and can be used for prediction.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Department of Mechanical Engineering Federal University of Rio Grande do Sul (UFRGS), R. Sarmento Leite 425National Space Research Institute (INPE) Combustion and Propulsion Laboratory Rod., Pres. Dutra, km 39São Paulo University (UNESP) School of Engineering Energy Department Guaratinguetá, Av. Ariberto P. da Cunha, 333São Paulo University (UNESP) School of Engineering Energy Department Guaratinguetá, Av. Ariberto P. da Cunha, 333FAPESP: 2015/23351-9FAPESP: 2015/25435-5Federal University of Rio Grande do Sul (UFRGS)Combustion and Propulsion Laboratory Rod.Universidade Estadual Paulista (Unesp)Mendiburu, Andrés Z.Serra, Aguinaldo M.Andrade, José C.Silva, Lucas M. [UNESP]Santos, José C.de Carvalho, João A. [UNESP]2019-10-06T16:43:27Z2019-10-06T16:43:27Z2019-11-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.energy.2019.115932Energy, v. 187.0360-5442http://hdl.handle.net/11449/18952310.1016/j.energy.2019.1159322-s2.0-85070870524Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengEnergyinfo:eu-repo/semantics/openAccess2021-10-23T00:57:17Zoai:repositorio.unesp.br:11449/189523Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T00:57:17Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Characterization of the flame front inversion of Ethanol–Air deflagrations inside A closed tube
title Characterization of the flame front inversion of Ethanol–Air deflagrations inside A closed tube
spellingShingle Characterization of the flame front inversion of Ethanol–Air deflagrations inside A closed tube
Mendiburu, Andrés Z.
Closed tubes
Deflagrations
Ethanol
Flame front inversion
title_short Characterization of the flame front inversion of Ethanol–Air deflagrations inside A closed tube
title_full Characterization of the flame front inversion of Ethanol–Air deflagrations inside A closed tube
title_fullStr Characterization of the flame front inversion of Ethanol–Air deflagrations inside A closed tube
title_full_unstemmed Characterization of the flame front inversion of Ethanol–Air deflagrations inside A closed tube
title_sort Characterization of the flame front inversion of Ethanol–Air deflagrations inside A closed tube
author Mendiburu, Andrés Z.
author_facet Mendiburu, Andrés Z.
Serra, Aguinaldo M.
Andrade, José C.
Silva, Lucas M. [UNESP]
Santos, José C.
de Carvalho, João A. [UNESP]
author_role author
author2 Serra, Aguinaldo M.
Andrade, José C.
Silva, Lucas M. [UNESP]
Santos, José C.
de Carvalho, João A. [UNESP]
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Federal University of Rio Grande do Sul (UFRGS)
Combustion and Propulsion Laboratory Rod.
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Mendiburu, Andrés Z.
Serra, Aguinaldo M.
Andrade, José C.
Silva, Lucas M. [UNESP]
Santos, José C.
de Carvalho, João A. [UNESP]
dc.subject.por.fl_str_mv Closed tubes
Deflagrations
Ethanol
Flame front inversion
topic Closed tubes
Deflagrations
Ethanol
Flame front inversion
description Ethanol–air deflagrations were experimentally studied inside a closed tube by varying the equivalence ratio (0.9–1.4) and the initial pressure (20–60 kPa). The flame front inversion phenomenon was observed in all tests. It was determined that the ratio of the distance of flat flame formation to the hydraulic diameter (df/dh) is a measurable parameter that allows the characterization of the phenomenon. For ethanol–air mixtures two dimensionless parameters can be used to correlate df/dh, namely, the ratio of the laminar flame speed to the speed of sound of the reactants (SL/CS,0) and the dimensionless distance travelled by the flame tip up to the time when the flame touches the lateral walls of the tube (ξtip,wall). Two correlations were obtained and the averages of the absolute values of the relative errors (AARE) were less than 1.2%. Another correlation was obtained considering published data of different fuel–air mixtures. A statistical analysis applied considering experimental data from published literature and from this work, showed an AARE of 8.95% and a coefficient of multiple determination (R2) of 0.79. The p-values of the regression coefficients were lower than 0.001. Therefore, the correlations present good accuracy and can be used for prediction.
publishDate 2019
dc.date.none.fl_str_mv 2019-10-06T16:43:27Z
2019-10-06T16:43:27Z
2019-11-15
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/10.1016/j.energy.2019.115932
Energy, v. 187.
0360-5442
http://hdl.handle.net/11449/189523
10.1016/j.energy.2019.115932
2-s2.0-85070870524
url http://dx.doi.org/10.1016/j.energy.2019.115932
http://hdl.handle.net/11449/189523
identifier_str_mv Energy, v. 187.
0360-5442
10.1016/j.energy.2019.115932
2-s2.0-85070870524
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Energy
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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