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Structural impact of the start-up sequence on Pelton turbines lifetime: Analytical prediction and polynomial optimization

Publications associées (67)

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A first characterization of the quench detection system for ITER

Luca Bottura

The purpose of this paper is to assess the expected response of conventional and non-conventional quench detection sensors proposed for the ITER coils, and to be tested in the QUELL experiment in SULTAN. The assessment is based on simulation of thermohydra ...

1995

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

Cavitation test of hydraulic machines : procedure and instrumentation

François Avellan

Model testing of hydraulic turbines, storage pumps and pump-turbines is of great importance especially for large units involved in power generation. Among all the aspects of machine operation, cavitation plays a fundamental role with respect to the possibl ...

ASME1993

The IMHEF system for cavitation nuclei injection

François Avellan

The necessity of controling the nuclei content of the circuit water while conducting cavitation tests on mode! hydraulic machines is considered to be indispensable. We are presenting a description of our cavitation nuclei producing device, the so-called nu ...

International Association For Hydraulic Research1992

Shock pressure generated by cavitation vortex collapse

François Avellan, Mohamed Farhat

Most of the severe erosion of hydraulic machines are found to be associated with the collapse of transient cavitation vortices downstream of a leading edge cavity. The dynamics of such a type of cavitation is investigated in a Cavitation Vortex Generator ( ...

The ASME1989

Dynamics of vortex cavitation involved in the erosion of hydraulic machines

François Avellan

In order to investigate the dynamics of the vortex cavitation, which is found to be responsible of the cavitation erosion in hydraulic machinery, a cavitation vortex generator (CVG) is used. By producing the cyclic growth and collapse of cavitation vortex, ...

1987

Fluid–structure interaction mechanisms leading to dangerous power swings in Francis turbines at full load

François Avellan, Arthur Tristan Favrel, Christian Landry, Andres Müller

Hydropower plants play an important regulatory role in the large scale integration of volatile renewable energy sources into the existing power grid. This duty however requires a continuous extension of their operating range, provoking the emergence of com ...