Publications de Pierre Maruzewski

On the upper part load vortex rope in Francis turbine: Experimental investigation

François Avellan, Christophe Nicolet, Amirreza Zobeiri, Pierre Maruzewski

The swirling flow developing in Francis turbine draft tube under part load operation leads to pressure fluctuations usually in the range of 0.2 to 0.4 times the runner rotational frequency resulting from the so-called vortex breakdown. For low cavitation n ...

International Association For Hydraulic Research2010

Turbulence modeling for Francis turbine water passages simulation

François Avellan, Henri-Pascal Mombelli, Pierre Maruzewski

The applications of Computational Fluid Dynamics, CFD, to hydraulic machines life require the ability to handle turbulent flows and to take into account the effects of turbulence on the mean flow. Nowadays, Direct Numerical Simulation, DNS, is still not a ...

International Association For Hydraulic Research2010

Prediction of a Francis turbine prototype full load instability from investigations on the reduced scale model

François Avellan, Pierre Maruzewski, Sébastien Alligné

The growing development of renewable energies combined with the process of privatization, lead to a change of economical energy market strategies. nstantaneous pricings of electricity as a function of demand or predictions, induces profitable peak producti ...

International Association For Hydraulic Research2010

SPH High-Performance Computing simulations of rigid solids impacting the free-surface of water

François Avellan, Pierre Maruzewski

Numerical simulations of water entries based on a three-dimensional parallelized Smoothed Particle Hydrodynamics (SPH) model developed by Ecole Centrale Nantes are presented. The aim of the paper is to show how such SPH simulations of complex 3D problems i ...

Taylor & Francis Ltd2010

Experimental investigation of a pump-turbine at off-design operating conditions

François Avellan, Mohamed Farhat, Pierre Maruzewski, Vlad Hasmatuchi

Pumped storage power plants are key components for the development of new renewable CO2-free primary energies and the security enhancement of electricity supply. They also offer interesting business opportunities in nowadays liberalized electricity market. ...

Brno University of Technology2009

SURFACE ROUGHNESS IMPACT ON FRANCIS TURBINE PERFORMANCES AND PREDICTION OF EFFICIENCY STEP UP

François Avellan, Henri-Pascal Mombelli, Pierre Maruzewski, Vlad Hasmatuchi

In the process of turbine modernizations, the investigation of the influences of water passage roughness on radial flow machine performance is crucial and validates the efficiency step up between reduced scale model and prototype. This study presents the s ...

2009

Numerical Simulation of Nonlinear Self Oscillations of a Full Load Vortex Rope

François Avellan, Christophe Nicolet, Nicolas Ruchonnet, Pierre Maruzewski, Vlad Hasmatuchi, Sébastien Alligné

Self excited instabilities or oscillations of a cavitating full load vortex rope occur due to an interaction between the gas volume and the acoustic waves. From the onset of the oscillations, the amplitudes grow until they reach a maximum, called the “limi ...

2009

Surface Roughness Impact on Francis Turbine Performances and Prediction of Efficiency Step Up

François Avellan, Henri-Pascal Mombelli, Pierre Maruzewski, Vlad Hasmatuchi

In the process of turbine modernizations, the investigation of the influences of water passage roughness on radial flow machine performance is crucial and validates the efficiency step up between reduced scale model and prototype. This study presents the s ...

International Association For Hydraulic Research2008