Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | RBRH (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312021000100235 |
Resumo: | ABSTRACT Stepped spillways can dissipate a great amount of energy during the flow passage over the chute, however these structures have limited operation due to the risk of cavitation damage. The induced aeration may protect the concrete chute through the air concentration near the channel bottom. Furthermore, some research studies have indicated that the presence of air in flows may reduce the mean pressures. The present research aims to analyze mean pressures, air entrainment coefficient and flow behavior over a stepped spillway with aeration induced by two different deflectors, comparing the results to natural aeration flow. Despite the jet impact influence, the induced aeration does not change significantly the mean pressures compared to natural aeration flow. The air entrainment coefficient, as well as the jet impact position, is higher for the deflector with the longer extension and, although air bubbles can be seen throughout the extension of the chute due to the air entrainment through the inferior flow surface, the induced aeration did not anticipate the boundary layer inception point position. |
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Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behaviorDeflectorPhysical modellingFlow aerationABSTRACT Stepped spillways can dissipate a great amount of energy during the flow passage over the chute, however these structures have limited operation due to the risk of cavitation damage. The induced aeration may protect the concrete chute through the air concentration near the channel bottom. Furthermore, some research studies have indicated that the presence of air in flows may reduce the mean pressures. The present research aims to analyze mean pressures, air entrainment coefficient and flow behavior over a stepped spillway with aeration induced by two different deflectors, comparing the results to natural aeration flow. Despite the jet impact influence, the induced aeration does not change significantly the mean pressures compared to natural aeration flow. The air entrainment coefficient, as well as the jet impact position, is higher for the deflector with the longer extension and, although air bubbles can be seen throughout the extension of the chute due to the air entrainment through the inferior flow surface, the induced aeration did not anticipate the boundary layer inception point position.Associação Brasileira de Recursos Hídricos2021-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312021000100235RBRH v.26 2021reponame:RBRH (Online)instname:Associação Brasileira de Recursos Hídricos (ABRH)instacron:ABRH10.1590/2318-0331.262120210098info:eu-repo/semantics/openAccessNovakoski,Carolina K.Ferla,RutePriebe,Priscila dos SantosAbreu,Aline SaupeMarques,Marcelo G.Prá,Maurício DaiCanellas,Alba V. B.Teixeira,Eder D.eng2021-11-25T00:00:00Zoai:scielo:S2318-03312021000100235Revistahttps://www.scielo.br/j/rbrh/https://old.scielo.br/oai/scielo-oai.php||rbrh@abrh.org.br2318-03311414-381Xopendoar:2021-11-25T00:00RBRH (Online) - Associação Brasileira de Recursos Hídricos (ABRH)false |
dc.title.none.fl_str_mv |
Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior |
title |
Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior |
spellingShingle |
Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior Novakoski,Carolina K. Deflector Physical modelling Flow aeration |
title_short |
Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior |
title_full |
Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior |
title_fullStr |
Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior |
title_full_unstemmed |
Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior |
title_sort |
Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior |
author |
Novakoski,Carolina K. |
author_facet |
Novakoski,Carolina K. Ferla,Rute Priebe,Priscila dos Santos Abreu,Aline Saupe Marques,Marcelo G. Prá,Maurício Dai Canellas,Alba V. B. Teixeira,Eder D. |
author_role |
author |
author2 |
Ferla,Rute Priebe,Priscila dos Santos Abreu,Aline Saupe Marques,Marcelo G. Prá,Maurício Dai Canellas,Alba V. B. Teixeira,Eder D. |
author2_role |
author author author author author author author |
dc.contributor.author.fl_str_mv |
Novakoski,Carolina K. Ferla,Rute Priebe,Priscila dos Santos Abreu,Aline Saupe Marques,Marcelo G. Prá,Maurício Dai Canellas,Alba V. B. Teixeira,Eder D. |
dc.subject.por.fl_str_mv |
Deflector Physical modelling Flow aeration |
topic |
Deflector Physical modelling Flow aeration |
description |
ABSTRACT Stepped spillways can dissipate a great amount of energy during the flow passage over the chute, however these structures have limited operation due to the risk of cavitation damage. The induced aeration may protect the concrete chute through the air concentration near the channel bottom. Furthermore, some research studies have indicated that the presence of air in flows may reduce the mean pressures. The present research aims to analyze mean pressures, air entrainment coefficient and flow behavior over a stepped spillway with aeration induced by two different deflectors, comparing the results to natural aeration flow. Despite the jet impact influence, the induced aeration does not change significantly the mean pressures compared to natural aeration flow. The air entrainment coefficient, as well as the jet impact position, is higher for the deflector with the longer extension and, although air bubbles can be seen throughout the extension of the chute due to the air entrainment through the inferior flow surface, the induced aeration did not anticipate the boundary layer inception point position. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312021000100235 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312021000100235 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/2318-0331.262120210098 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Associação Brasileira de Recursos Hídricos |
publisher.none.fl_str_mv |
Associação Brasileira de Recursos Hídricos |
dc.source.none.fl_str_mv |
RBRH v.26 2021 reponame:RBRH (Online) instname:Associação Brasileira de Recursos Hídricos (ABRH) instacron:ABRH |
instname_str |
Associação Brasileira de Recursos Hídricos (ABRH) |
instacron_str |
ABRH |
institution |
ABRH |
reponame_str |
RBRH (Online) |
collection |
RBRH (Online) |
repository.name.fl_str_mv |
RBRH (Online) - Associação Brasileira de Recursos Hídricos (ABRH) |
repository.mail.fl_str_mv |
||rbrh@abrh.org.br |
_version_ |
1754734702299709440 |