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Cavitation test of hydraulic machines : procedure and instrumentation

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Tool Path Generation and Post-Processor Issues in Five-Axis High Speed Machining of Hydro Turbine Blades

François Avellan, Christophe Tournier

This paper deals with 5-axis milling of hydraulic blades. The issue developed is essentially linked to problems due to the transition from 3 to 5 axes. A specific attention is done to the Inverse Kinematics Transformation (IKT) which can be source of incoh ...

2006

Introduction to Cavitation in Hydraulic Machinery

François Avellan

Design, operation and refurbishment of hydraulic turbines, pumps or pump-turbine are strongly related to cavitation flow phenomena, which may occur in either the rotating runner-impeller or the stationary parts of the machine. The paper presents the cavita ...

Politehnica University of Timișoara2004

Unsteady Rotor - Stator Analysis of Hydraulic Pump - Turbine : CFD and Experimental Approach

François Avellan

The parallel rotor-stator computation capabilities of Fine Turbo and CFX-TASCflow CFD commercial codes have been investigated within the frame of the European ESPRIT project HPNURSA. Unsteady computations have been performed for simple test cases, where fl ...

International Association For Hydraulic Research2002

Etude du comportement dynamique des turbines Francis

A common phenomenon in Francis turbines is draft tube surge. In these fixed-bladed machines, a strong runner outlet swirl can develop under off-design conditions. The action of the diffuser, and in particular the draft tube elbow, on the rotating flow fiel ...

EPFL2000

Prediction of Francis Turbines Efficiency Alteration by travelling Bubble Cavitation

François Avellan, Philippe Dupont

The setting level of a hydraulic machine, specially for low head machines, is decided with respect to the possible alteration of the efficiency due to the cavity development. This alteration can easily be noticed by plotting the evolution of the efficiency ...

International Association For Hydraulic Research1998

Analyse et prédiction de la baisse de rendement des turbines Francis par cavitation à bulles

The setting level of an hydraulic machine, specially for low head machines, is decided with respect to the possible alteration of the efficiency due to the cavity development. This alteration can easily be noticed by plotting the evolution of the efficienc ...

EPFL1998

Flow Calculations in Pelton Turbines,- Part 2 : Free Surface Flows

François Avellan, Philippe Dupont, Sonia Kvicinsky

Hydraulic machine design can now take advantage of advanced flow calculation methods which are made available by several CFD software companies. Thanks to these recent developments, the so called "Volume Of Fluid" (VOF) methods can be now used for the anal ...

International Association For Hydraulic Research1998

Efficiency Alteration of Francis Turbines by travelling Bubble Cavitation

François Avellan, Philippe Dupont

Kluwer Academic Publishers1996

Mechanism of the Efficiency Drop due to traveling Bubble Cavitation

François Avellan

The setting level of a hydraulic machine, specially for low head machines, is decided with respect to the possible alteration of the efficiency due to the cavity development. In the case of traveling bubble cavitation, corresponding to the outlet cavitatio ...

International Association For Hydraulic Research1994

Contribution à l'étude de l'érosion de cavitation

Mohamed Farhat

In the field of hydraulic power plant, the leading edge cavitation is often responsible of sever erosion which may cause a premature shutdown of energy production with costly consequences. This type of cavitation is characterized by an attached vapour cavi ...

EPFL1994