Combustion Characteristics of Premixed Hydrogen/Air in an Undulate Microchannel
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.3390/en15020626 http://hdl.handle.net/11449/223273 |
Resumo: | This work reports a numerical investigation of microcombustion in an undulate microchan-nel, using premixed hydrogen and air to understand the effect of the burner design on the flame in order to obtain stability of the flame. The simulations were performed for a fixed equivalence ratio and a hyperbolic temperature profile imposed at the microchannel walls in order to mimic the heat external losses occurred in experimental setups. Due to the complexity of the flow dynamics combined with the combustion behavior, the present study focuses on understanding the effect of the fuel inlet rate on the flame characteristics, keeping other parameters constant. The results presented stable flame structure regardless of the inlet velocity for this type of design, meaning that a significant reduction in the heat flux losses through the walls occurred, allowing the design of new simpler systems. The increase in inlet velocity increased the flame extension, with the flame being stretched along the microchannel. For higher velocities, flame separation was observed, with two detected different combustion zones, and the temperature profiles along the burner centerline presented a non-monotonic decrease due to the dynamics of the vortices observed in the convex regions of the undulated geometry walls. The geometry effects on the flame structure, flow field, thermal evolution and species distribution for different inlet velocities are reported and discussed. |
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Combustion Characteristics of Premixed Hydrogen/Air in an Undulate MicrochannelComplex geometryHydrogenMicrocombustionNumerical studyThis work reports a numerical investigation of microcombustion in an undulate microchan-nel, using premixed hydrogen and air to understand the effect of the burner design on the flame in order to obtain stability of the flame. The simulations were performed for a fixed equivalence ratio and a hyperbolic temperature profile imposed at the microchannel walls in order to mimic the heat external losses occurred in experimental setups. Due to the complexity of the flow dynamics combined with the combustion behavior, the present study focuses on understanding the effect of the fuel inlet rate on the flame characteristics, keeping other parameters constant. The results presented stable flame structure regardless of the inlet velocity for this type of design, meaning that a significant reduction in the heat flux losses through the walls occurred, allowing the design of new simpler systems. The increase in inlet velocity increased the flame extension, with the flame being stretched along the microchannel. For higher velocities, flame separation was observed, with two detected different combustion zones, and the temperature profiles along the burner centerline presented a non-monotonic decrease due to the dynamics of the vortices observed in the convex regions of the undulated geometry walls. The geometry effects on the flame structure, flow field, thermal evolution and species distribution for different inlet velocities are reported and discussed.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)proMetheus Escola Superior de Tecnologia e Gestão Instituto Politécnico de Viana do Castelo, Viana do CasteloCEFT Department of Mechanical Engineering University of PortoInstitute of Science and Technology São Paulo State University (Unesp)Institute of Science and Technology São Paulo State University (Unesp)FAPESP: 2015/26842-3Instituto Politécnico de Viana do CasteloUniversity of PortoUniversidade Estadual Paulista (UNESP)Resende, Pedro R.Morais, Leandro C. [UNESP]Pinho, CarlosAfonso, Alexandre M.2022-04-28T19:49:39Z2022-04-28T19:49:39Z2022-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.3390/en15020626Energies, v. 15, n. 2, 2022.1996-1073http://hdl.handle.net/11449/22327310.3390/en150206262-s2.0-85122979297Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengEnergiesinfo:eu-repo/semantics/openAccess2022-04-28T19:49:39Zoai:repositorio.unesp.br:11449/223273Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462022-04-28T19:49:39Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Combustion Characteristics of Premixed Hydrogen/Air in an Undulate Microchannel |
title |
Combustion Characteristics of Premixed Hydrogen/Air in an Undulate Microchannel |
spellingShingle |
Combustion Characteristics of Premixed Hydrogen/Air in an Undulate Microchannel Resende, Pedro R. Complex geometry Hydrogen Microcombustion Numerical study |
title_short |
Combustion Characteristics of Premixed Hydrogen/Air in an Undulate Microchannel |
title_full |
Combustion Characteristics of Premixed Hydrogen/Air in an Undulate Microchannel |
title_fullStr |
Combustion Characteristics of Premixed Hydrogen/Air in an Undulate Microchannel |
title_full_unstemmed |
Combustion Characteristics of Premixed Hydrogen/Air in an Undulate Microchannel |
title_sort |
Combustion Characteristics of Premixed Hydrogen/Air in an Undulate Microchannel |
author |
Resende, Pedro R. |
author_facet |
Resende, Pedro R. Morais, Leandro C. [UNESP] Pinho, Carlos Afonso, Alexandre M. |
author_role |
author |
author2 |
Morais, Leandro C. [UNESP] Pinho, Carlos Afonso, Alexandre M. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Instituto Politécnico de Viana do Castelo University of Porto Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Resende, Pedro R. Morais, Leandro C. [UNESP] Pinho, Carlos Afonso, Alexandre M. |
dc.subject.por.fl_str_mv |
Complex geometry Hydrogen Microcombustion Numerical study |
topic |
Complex geometry Hydrogen Microcombustion Numerical study |
description |
This work reports a numerical investigation of microcombustion in an undulate microchan-nel, using premixed hydrogen and air to understand the effect of the burner design on the flame in order to obtain stability of the flame. The simulations were performed for a fixed equivalence ratio and a hyperbolic temperature profile imposed at the microchannel walls in order to mimic the heat external losses occurred in experimental setups. Due to the complexity of the flow dynamics combined with the combustion behavior, the present study focuses on understanding the effect of the fuel inlet rate on the flame characteristics, keeping other parameters constant. The results presented stable flame structure regardless of the inlet velocity for this type of design, meaning that a significant reduction in the heat flux losses through the walls occurred, allowing the design of new simpler systems. The increase in inlet velocity increased the flame extension, with the flame being stretched along the microchannel. For higher velocities, flame separation was observed, with two detected different combustion zones, and the temperature profiles along the burner centerline presented a non-monotonic decrease due to the dynamics of the vortices observed in the convex regions of the undulated geometry walls. The geometry effects on the flame structure, flow field, thermal evolution and species distribution for different inlet velocities are reported and discussed. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-04-28T19:49:39Z 2022-04-28T19:49:39Z 2022-01-01 |
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/10.3390/en15020626 Energies, v. 15, n. 2, 2022. 1996-1073 http://hdl.handle.net/11449/223273 10.3390/en15020626 2-s2.0-85122979297 |
url |
http://dx.doi.org/10.3390/en15020626 http://hdl.handle.net/11449/223273 |
identifier_str_mv |
Energies, v. 15, n. 2, 2022. 1996-1073 10.3390/en15020626 2-s2.0-85122979297 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Energies |
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_ |
1803046079498813440 |