Impacts of dilution on hydrogen combustion characteristics and nox emissions
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , |
Tipo de documento: | Artigo de conferência |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1115/IMECE2017-71720 http://hdl.handle.net/11449/221003 |
Resumo: | Combustion characteristics at small scales have been studied continuously due to the potential applications in portable power devices. It is known that heat release impacts at small scales result in different flame behavior as compared to conventional scales. The impacts of geometry, stoichiometry, flow rates, wall temperatures, etc. are widely studied in literature. However, dilution impacts still need to be further studied due to its important role on controlling the flame behavior and subsequent pollutants emissions at these scales. In this work, premixed hydrogen/air combustion is simulated at an axis-symmetric micro channel (with diameter D = 0:8mm and length L = 10mm), where detailed chemical kinetics are implemented in simulations (32 species and 173 reactions). The heat transfer on the wall is considered by imposing a hyperbolic temperature profile on the wall, where the wall temperature increases from 300 K at the inlet to 1300 K at the outlet. With this setup, a range of equivalence ratios including a typical fuel-lean regime (Φ= 0:7), stoichiometric regime (Φ= 1:0) and and two cases at an ultra-rich regime (Φ= 2:0 and Φ= 3:0) are investigated. For each equivalence ratio, excess dilution (using N2) is introduced to the mixture and its impact is compared with other cases. With that, the impacts of dilution variations on the combustion characteristics of premixed hydrogen/air are investigated for different equiva lence ratios. More specifically, several incidents such as flame dynamics, flame stabilization, extinctions and NOx emissions are studied for the aforementioned operating conditions. |
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Impacts of dilution on hydrogen combustion characteristics and nox emissionsDilution impactsMicro combustionNOx emissionsNumerical simulationsCombustion characteristics at small scales have been studied continuously due to the potential applications in portable power devices. It is known that heat release impacts at small scales result in different flame behavior as compared to conventional scales. The impacts of geometry, stoichiometry, flow rates, wall temperatures, etc. are widely studied in literature. However, dilution impacts still need to be further studied due to its important role on controlling the flame behavior and subsequent pollutants emissions at these scales. In this work, premixed hydrogen/air combustion is simulated at an axis-symmetric micro channel (with diameter D = 0:8mm and length L = 10mm), where detailed chemical kinetics are implemented in simulations (32 species and 173 reactions). The heat transfer on the wall is considered by imposing a hyperbolic temperature profile on the wall, where the wall temperature increases from 300 K at the inlet to 1300 K at the outlet. With this setup, a range of equivalence ratios including a typical fuel-lean regime (Φ= 0:7), stoichiometric regime (Φ= 1:0) and and two cases at an ultra-rich regime (Φ= 2:0 and Φ= 3:0) are investigated. For each equivalence ratio, excess dilution (using N2) is introduced to the mixture and its impact is compared with other cases. With that, the impacts of dilution variations on the combustion characteristics of premixed hydrogen/air are investigated for different equiva lence ratios. More specifically, several incidents such as flame dynamics, flame stabilization, extinctions and NOx emissions are studied for the aforementioned operating conditions.Institute of Science and Technology Saõ Paulo State UniversityTransport Phenomena Research Centre Department of Mechanical Engineering University of PortoDivision of Engineering Technology College of Engineering Wayne State UniversitySaõ Paulo State UniversityUniversity of PortoWayne State UniversityResende, PedroAfonso, AlexandrePinho, CarlosAyoobi, Mohsen2022-04-28T19:07:26Z2022-04-28T19:07:26Z2017-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjecthttp://dx.doi.org/10.1115/IMECE2017-71720ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), v. 8.http://hdl.handle.net/11449/22100310.1115/IMECE2017-717202-s2.0-85041012874Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)info:eu-repo/semantics/openAccess2022-04-28T19:07:27Zoai:repositorio.unesp.br:11449/221003Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-05-23T20:34:21.397074Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Impacts of dilution on hydrogen combustion characteristics and nox emissions |
title |
Impacts of dilution on hydrogen combustion characteristics and nox emissions |
spellingShingle |
Impacts of dilution on hydrogen combustion characteristics and nox emissions Resende, Pedro Dilution impacts Micro combustion NOx emissions Numerical simulations |
title_short |
Impacts of dilution on hydrogen combustion characteristics and nox emissions |
title_full |
Impacts of dilution on hydrogen combustion characteristics and nox emissions |
title_fullStr |
Impacts of dilution on hydrogen combustion characteristics and nox emissions |
title_full_unstemmed |
Impacts of dilution on hydrogen combustion characteristics and nox emissions |
title_sort |
Impacts of dilution on hydrogen combustion characteristics and nox emissions |
author |
Resende, Pedro |
author_facet |
Resende, Pedro Afonso, Alexandre Pinho, Carlos Ayoobi, Mohsen |
author_role |
author |
author2 |
Afonso, Alexandre Pinho, Carlos Ayoobi, Mohsen |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Saõ Paulo State University University of Porto Wayne State University |
dc.contributor.author.fl_str_mv |
Resende, Pedro Afonso, Alexandre Pinho, Carlos Ayoobi, Mohsen |
dc.subject.por.fl_str_mv |
Dilution impacts Micro combustion NOx emissions Numerical simulations |
topic |
Dilution impacts Micro combustion NOx emissions Numerical simulations |
description |
Combustion characteristics at small scales have been studied continuously due to the potential applications in portable power devices. It is known that heat release impacts at small scales result in different flame behavior as compared to conventional scales. The impacts of geometry, stoichiometry, flow rates, wall temperatures, etc. are widely studied in literature. However, dilution impacts still need to be further studied due to its important role on controlling the flame behavior and subsequent pollutants emissions at these scales. In this work, premixed hydrogen/air combustion is simulated at an axis-symmetric micro channel (with diameter D = 0:8mm and length L = 10mm), where detailed chemical kinetics are implemented in simulations (32 species and 173 reactions). The heat transfer on the wall is considered by imposing a hyperbolic temperature profile on the wall, where the wall temperature increases from 300 K at the inlet to 1300 K at the outlet. With this setup, a range of equivalence ratios including a typical fuel-lean regime (Φ= 0:7), stoichiometric regime (Φ= 1:0) and and two cases at an ultra-rich regime (Φ= 2:0 and Φ= 3:0) are investigated. For each equivalence ratio, excess dilution (using N2) is introduced to the mixture and its impact is compared with other cases. With that, the impacts of dilution variations on the combustion characteristics of premixed hydrogen/air are investigated for different equiva lence ratios. More specifically, several incidents such as flame dynamics, flame stabilization, extinctions and NOx emissions are studied for the aforementioned operating conditions. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-01-01 2022-04-28T19:07:26Z 2022-04-28T19:07:26Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/conferenceObject |
format |
conferenceObject |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1115/IMECE2017-71720 ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), v. 8. http://hdl.handle.net/11449/221003 10.1115/IMECE2017-71720 2-s2.0-85041012874 |
url |
http://dx.doi.org/10.1115/IMECE2017-71720 http://hdl.handle.net/11449/221003 |
identifier_str_mv |
ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), v. 8. 10.1115/IMECE2017-71720 2-s2.0-85041012874 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) |
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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1803045682051809280 |