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Etude de l'influence des instationnarités des écoulements sur le développement de la cavitation

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Analyse du champ de pression pariétale d'un diffuseur coudé de turbine Francis

At this time, a large number of hydraulic turbomachinery installations are ageing, so that they need refurbishement to increase their efficiency and their associated output power. The items that need refurbishement are mainly the runner and the guide vanes ...

EPFL2003

Physical investigation of cavitation vortex collapse

Philippe Couty

Among the different negative cavitation effects that are associated with the cavitation presence (efficiency drop, noise and vibrations etc.), cavitation erosion is still one of the main limiting features in the modern trend towards designing hydraulic mac ...

EPFL2002

Pressure Wall Measurements in the whole Draft Tube : Steady and Unsteady Analysis

François Avellan

Flow in a elbow draft tube is a turbulent complex unsteady flow caused by its rotating nature and the draft tube's geometry. The understanding of the main phenomena that could appear near the BEP and at off-design conditions is important to master the inst ...

International Association For Hydraulic Research2002

Physical Investigation of the Cavitation Phenomenon

François Avellan, Mohamed Farhat, Jean-François Caron

The work presented in this paper is part of a comprehensive research effort aimed at understanding the influence of flow unsteadiness on leading edge cavitation. Pressure measurements are made on the suction side of an oscillating hydrofoil in the High-Spe ...

2000

Détection vibratoire de l'érosion de cavitation des turbines Francis

Cavitation erosion of Francis turbines continues to impose costly repairs and loss of revenues. This erosion is primarily caused by leading edge cavitation. A revue of the literature reveals the non-existence of an absolutely validated detection technique ...

EPFL2000

The influence of flow unsteadiness on erosive cavity dynamics

François Avellan, Mohamed Farhat, Jean-François Caron

This paper presents investigations of unsteady flow conditions influence over cavitation dynamics. Measurements of wall pressure fluctuations in a model turbine are first introduced. It is shown that the wake of the spiral casing tongue modulates cavity dy ...

American Society of Mechanical Engineers1999

Polarization-modulated FTIR spectroscopy of lipid/gramicidin monolayers at the air/water interface

Horst Vogel

Monolayers of gramicidin A, pure and in mixts. with dimyristoylphosphatidylcholine (DMPC), were studied in situ at the air/H2O and air/D2O interfaces by polarization-modulated IR reflection absorption spectroscopy (PM-IRRAS). Simulations of the entire set ...

1999

Experimental flow study of the GAMM turbine model

François Avellan, Mohamed Farhat, Philippe Dupont

An experimental study of flow in a Francis hydraulic turbine, especially designed for the GAMM Workshop, has been carried out. In order to provide a data base for the validation and comparison of computational fluid dynamics codes, a Francis turbine mode! ...

Vieweg & Sohn1993

Qualification of a centerbody cavitation nuclei counter using optical techniques

A study about size measurements of cavitation nuclei is performed, by comparing results from different techniques as Holography, Phases Doppler and Centerbody Venturi. These systems are installed in line along a new installation, specially designed to guar ...

International Association For Hydraulic Research1992