Publication

Influence de la chute d'essai et de la nucléation sur les performances en cavitation des modèles de turbines Francis

François Avellan
1986
Conference Papers

Abstract

Une étude experimentale de l'influence de la chute d ' essai et d'une manière plus générale de la nucléation de l'eau sur l'altération des performances d 'une turbine Francis avec le chiffre de cavitation a été menée dans quatre laboratoires differents . Cette étude , qui s'appuie sur des essais en cavitation au regime optimal de cinq modèles reduits de turbines de chiffre de vitesse s'etendant de nu = 0.30 a nu = 0.59, permet de dégager deux éléments principaux pour les points de fonctionnement considérés. - l' existence d' un seuil pour la chute d' essai ou la concentration de noyaux de cavitation au-delà duquel les performances en cavitation du modèle (courbes eta - sigma) ne sont plus affectées par ces paramètres (phénomène de saturation) une évolution décroissante du niveau de ce seuil de saturation avec le chiffre de vitesse spécifique nu.

Official source

https://infoscience.epfl.ch/entities/publication/b7fe61b4-c660-4534-8f4a-0c9d33b98780

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François Avellan
1986
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b7fe61b4-c660-4534-8f4a-0c9d33b98780

About this result

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