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...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Carolina K. Novakoski [verfasserIn] Rute Ferla [verfasserIn] Priscila dos Santos Priebe [verfasserIn] Aline Saupe Abreu [verfasserIn] Marcelo G. Marques [verfasserIn] Maurício Dai Prá [verfasserIn] Alba V. B. Canellas [verfasserIn] Eder D. Teixeira [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch ; Portugiesisch

Erschienen:	2021

Schlagwörter:	Deflector Physical modelling Flow aeration

Übergeordnetes Werk:	In: Revista Brasileira de Recursos Hídricos - Associação Brasileira de Recursos Hídricos, 2016, 26(2021)
Übergeordnetes Werk:	volume:26 ; year:2021

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.1590/2318-0331.262120210098

Katalog-ID:	DOAJ014016028

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callnumber-first	T - Technology
author	Carolina K. Novakoski
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title	Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior
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title_full	Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior
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author_browse	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
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title_sort	induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior
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title_auth	Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior
abstract	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.
abstractGer	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.
abstract_unstemmed	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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title_short	Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior
url	https://doi.org/10.1590/2318-0331.262120210098 https://doaj.org/article/609bff676c8949fb9283a43774ef74db http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312021000100235&tlng=en https://doaj.org/toc/2318-0331
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up_date	2024-07-03T20:47:58.267Z
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Induced aeration flow over stepped spillways: mean pressures, air entrainment and flow behavior

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