Evaluation of high-velocity plunging jet-issuing characteristics as a basis for plunge pool analysis / P. F. A. Manso in Journal of hydraulic research, Vol. 46 N°2 (2008)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 46 N°2 (2008) . - p. 147-157 Titre : Evaluation of high-velocity plunging jet-issuing characteristics as a basis for plunge pool analysis Titre original : Etude des caractéristiques à la sortie de jets plongeants à haute-vitesse comme base pour l'analyse de bassins amortisseurs par impact de jets Type de document : texte imprimé Auteurs : P. F. A. Manso, Auteur ; E. F. R. Bollaert, Auteur ; A. J. Schleiss, Auteur Article en page(s) : p. 147-157 Note générale : Hydraulique Résumé en Français Langues : Anglais (eng) Mots-clés : Dynamic pressures Plunging jets Pressure distribution Spillways Turbulence intensity 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 : This paper presents experimental work on the characteristics of jets issuing from water-releasing structures. Systematic experimental tests have been performed at near-prototype velocities of up to 30 m/s using a cylindrical jet nozzle. Dynamic pressures were measured along the diameter at the nozzle outlet with an acquisition rate of up to 2 kHz, for different upstream supply conditions. These measurements allowed assessing the mean and the fluctuating characteristics of the jet. The influence of supply circuit secondary currents, aeration and geometrical contraction on jet turbulence intensity and velocity profiles is discussed. The initial turbulence intensity varies from 2 to 8%, whereas the kinetic energy correction factor ranges from 1.0 to 1.1. Statistical analysis of pressure measurements shows that jet core pressures follow a Gaussian distribution fairly well for non-exceedence probabilities between 0.1 and 0.999. The experimental results and an extensive literature survey are used to define issuance parameters relevant for engineering practice. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com [article] Evaluation of high-velocity plunging jet-issuing characteristics as a basis for plunge pool analysis = Etude des caractéristiques à la sortie de jets plongeants à haute-vitesse comme base pour l'analyse de bassins amortisseurs par impact de jets [texte imprimé] / P. F. A. Manso, Auteur ; E. F. R. Bollaert, Auteur ; A. J. Schleiss, Auteur . - p. 147-157. Hydraulique Résumé en Français Langues : Anglais (eng) in Journal of hydraulic research > Vol. 46 N°2 (2008) . - p. 147-157 Mots-clés : Dynamic pressures Plunging jets Pressure distribution Spillways Turbulence intensity 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 : This paper presents experimental work on the characteristics of jets issuing from water-releasing structures. Systematic experimental tests have been performed at near-prototype velocities of up to 30 m/s using a cylindrical jet nozzle. Dynamic pressures were measured along the diameter at the nozzle outlet with an acquisition rate of up to 2 kHz, for different upstream supply conditions. These measurements allowed assessing the mean and the fluctuating characteristics of the jet. The influence of supply circuit secondary currents, aeration and geometrical contraction on jet turbulence intensity and velocity profiles is discussed. The initial turbulence intensity varies from 2 to 8%, whereas the kinetic energy correction factor ranges from 1.0 to 1.1. Statistical analysis of pressure measurements shows that jet core pressures follow a Gaussian distribution fairly well for non-exceedence probabilities between 0.1 and 0.999. The experimental results and an extensive literature survey are used to define issuance parameters relevant for engineering practice. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com

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