Free-surface stretching-sustained intake vortices / Rupp Carriveau in Journal of hydraulic research, Vol. 47 N° 4 (2009)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 47 N° 4 (2009) . - pp. 486-491 Titre : Free-surface stretching-sustained intake vortices Titre original : Vortex de prise soutenus par étirement en surface Type de document : texte imprimé Auteurs : Rupp Carriveau, Auteur ; Gregory A. Koop, Auteur ; Raouf E. Baddour, Auteur Article en page(s) : pp. 486-491 Note générale : Hydraulique Résumé en Français Langues : Anglais (eng) Mots-clés : Dye-core vortex Free-surface intake Intake submergence model formation Stretching-sustained Vortex stret ching Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : An experimental investigation of vortices at deep hydraulic intakes revealed two distinct categories of free surface intake vortex. In case 1 when the strain field was strong enough, without an external, quantifiable source of vorticity, minor asymmetries in the near radial intake flow were concentrated and amplified into a vortex core that was purely stretching sustained (PSS). This vortex did not decay so long as the rate of intake withdrawal did not decrease. In case 2, vortex formation required that there be an ample and regular supply of external vorticity to interact with weaker strain fields. These non-purely stretching-sustained (NPSS) vortices decay with a decrease in externally supplied vorticity while maintaining the rate of intake withdrawal. A parameter, here named the stretching-sustained submergence, was postulated to classify conditions suitable for purely stretching sustained vortex formation. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com [article] Free-surface stretching-sustained intake vortices = Vortex de prise soutenus par étirement en surface [texte imprimé] / Rupp Carriveau, Auteur ; Gregory A. Koop, Auteur ; Raouf E. Baddour, Auteur . - pp. 486-491. Hydraulique Résumé en Français Langues : Anglais (eng) in Journal of hydraulic research > Vol. 47 N° 4 (2009) . - pp. 486-491 Mots-clés : Dye-core vortex Free-surface intake Intake submergence model formation Stretching-sustained Vortex stret ching Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : An experimental investigation of vortices at deep hydraulic intakes revealed two distinct categories of free surface intake vortex. In case 1 when the strain field was strong enough, without an external, quantifiable source of vorticity, minor asymmetries in the near radial intake flow were concentrated and amplified into a vortex core that was purely stretching sustained (PSS). This vortex did not decay so long as the rate of intake withdrawal did not decrease. In case 2, vortex formation required that there be an ample and regular supply of external vorticity to interact with weaker strain fields. These non-purely stretching-sustained (NPSS) vortices decay with a decrease in externally supplied vorticity while maintaining the rate of intake withdrawal. A parameter, here named the stretching-sustained submergence, was postulated to classify conditions suitable for purely stretching sustained vortex formation. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com

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