Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior
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. F...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Recursos Hídricos
2021-11-01
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| Series: | Revista Brasileira de Recursos Hídricos |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312021000100235&tlng=en |
| _version_ | 1819284459962236928 |
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| author | Carolina K. Novakoski Rute Ferla Priscila dos Santos Priebe Aline Saupe Abreu Marcelo G. Marques Maurício Dai Prá Alba V. B. Canellas Eder D. Teixeira |
| author_facet | Carolina K. Novakoski Rute Ferla Priscila dos Santos Priebe Aline Saupe Abreu Marcelo G. Marques Maurício Dai Prá Alba V. B. Canellas Eder D. Teixeira |
| author_sort | Carolina K. Novakoski |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-24T01:47:43Z |
| format | Article |
| id | doaj.art-609bff676c8949fb9283a43774ef74db |
| institution | Directory Open Access Journal |
| issn | 2318-0331 |
| language | English |
| last_indexed | 2024-12-24T01:47:43Z |
| publishDate | 2021-11-01 |
| publisher | Associação Brasileira de Recursos Hídricos |
| record_format | Article |
| series | Revista Brasileira de Recursos Hídricos |
| spelling | doaj.art-609bff676c8949fb9283a43774ef74db2022-12-21T17:21:49ZengAssociação Brasileira de Recursos HídricosRevista Brasileira de Recursos Hídricos2318-03312021-11-012610.1590/2318-0331.262120210098Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behaviorCarolina K. Novakoskihttps://orcid.org/0000-0002-3740-7555Rute Ferlahttps://orcid.org/0000-0002-7056-3306Priscila dos Santos Priebehttps://orcid.org/0000-0002-1336-5450Aline Saupe Abreuhttps://orcid.org/0000-0003-1472-6518Marcelo G. Marqueshttps://orcid.org/0000-0002-9948-3094Maurício Dai PráAlba V. B. CanellasEder D. TeixeiraABSTRACT 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312021000100235&tlng=enDeflectorPhysical modellingFlow aeration |
| spellingShingle | Carolina K. Novakoski Rute Ferla Priscila dos Santos Priebe Aline Saupe Abreu Marcelo G. Marques Maurício Dai Prá Alba V. B. Canellas Eder D. Teixeira Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior Revista Brasileira de Recursos Hídricos Deflector Physical modelling Flow aeration |
| title | 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_short | 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 |
| topic | Deflector Physical modelling Flow aeration |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312021000100235&tlng=en |
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