Characterization of the flame front inversion of Ethanol–Air deflagrations inside A closed tube
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , |
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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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 |
|
_version_ |
1799965544113242112 |