Recherche

Afficher tous les résultats pour

Accueil

Personne

François Avellan

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (218)

Engineering & Performance of DuoTurbo: Microturbine with Counter-Rotating Runners

François Avellan, Vlad Hasmatuchi, Loïc Andolfatto, Daniel Biner

Considering the nuclear phase-out strategy of several European countries and the future tendency to promote renewable energies, the exploitation of small hydropower sites (

International Association For Hydraulic Research2016

Numerical and experimental evidence of the inter-blade cavitation vortex development at deep part load operation of a Francis turbine

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

Francis turbines are subject to various types of the cavitation flow depending on the operating condition s. In order to compensate for the stochastic nature of renewable energy sources, it is more and more required to extend the operating range of the gen ...

International Association For Hydraulic Research2016

Space and time reconstruction of the precessing vortex core in Francis turbine draft tube by 2D-PIV

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

Francis turbines operating at part load conditions experience the development of a high swirling flow at the runner outlet, giving rise to the development of a cavitation precessing vortex rope in the draft tube. The latter acts as an excitation source for ...

International Association For Hydraulic Research2016

RANS computations for identification of 1-D cavitation model parameters: application to full load cavitation vortex rope

François Avellan, Christophe Nicolet, Andres Müller, Sébastien Alligné

Due to the massive penetration of alternative renewable energies, hydropower is a key energy conversion technology for stabilizing the electrical power network by using hydraulic machines at off design operating conditions. At full load, the axisymmetric c ...

International Association For Hydraulic Research2016

Impact erosion prediction using the finite volume particle method with improved constitutive models

François Avellan, Christian Vessaz, Ebrahim Jahanbakhsh, Sebastián Camilo Leguizamón Sarmiento, Siamak Alimirzazadeh, Audrey Paulette Solange Maertens

Erosion damage in hydraulic turbines is a common problem caused by the high- velocity impact of small particles entrained in the fluid. In this investigation, the Finite Volume Particle Method is used to simulate the three-dimensional impact of rigid spher ...

IOP Publishing Ltd2016

Hydroelectric System Response to Part Load Vortex Rope Excitation

François Avellan, Christophe Nicolet, Antoine Béguin, Christian Landry, Sébastien Alligné, Joao Gomes Pereira Junior

The prediction of pressure and output power fluctuations amplitudes on Francis turbine prototype is a challenge for hydro-equipment industry since it is subjected to guarantees to ensure smooth and reliable operation of the hydro units. The European FP7 re ...

International Association For Hydraulic Research2016

Simulation of energy recovery on water utility networks by a micro-turbine with counter-rotating runners

François Avellan, Cécile Münch-Alligné, Vlad Hasmatuchi, Elena Vagnoni, Loïc Andolfatto

Wherever relief valves and other energy dissipation devices are installed to limit the pressure, water utility networks provide unexploited hydropower potentials. This is mainly due to a lack of economically viable technologies for energy recovery in the p ...

International Association For Hydraulic Research2016

Local wave speed and bulk flow viscosity in Francis turbines at part load operation

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

The operation of Francis turbines at off-design conditions may cause the development of a cavitation vortex rope in the draft tube cone, acting as a pressure excitation source. The interactions between this excitation source and the hydraulic system at the ...

Taylor & Francis Ltd2016

Automated hill chart modeling procedure to estimate the performance of double regulated units

François Avellan, Henri-Pascal Mombelli, Loïc Andolfatto

The work presented in this paper details an original procedure developed in order to automatically build on-cam surfaces for double-regulated hydropower units such as Kaplan or bulb turbines. The proposed method allows a sparse exploration of the operating ...

2016

A spherical kernel for the Finite Volume Particle Method and application to surface tension

François Avellan, Ebrahim Jahanbakhsh, Audrey Paulette Solange Maertens

2016

LDV survey of cavitation and resonance effect on the precessing vortex rope dynamics in the draft tube of Francis turbines

François Avellan, Christian Landry, Arthur Tristan Favrel, Keita Yamamoto

The large-scale penetration of the electrical grid by intermittent renewable energy sources requires a continuous operating range extension of hydropower plants. This causes the formation of unfavourable flow patterns in the draft tube of turbines and pump ...

Springer Verlag2016

Large Eddy Simulation of the Rotating Stall in a Pump-Turbine Operated in Pumping Mode at a Part-Load Condition

François Avellan, Olivier Pacot, Chisachi Kato

The investigation of the rotating stall phenomenon appearing in the HYDRODYNA pump-turbine reduced scale model is carried out by performing a large-scale large eddy simulation (LES) computation using a mesh featuring approximately 85 x 10(6) elements. The ...

American Society of Mechanical Engineers2016

Study of the drivers and asset management of pumped-storage power plants historical and geographical perspective

François Avellan, François Richard Vuille, Massimiliano Capezzali, Mélanie Guittet, Franco Romerio, Ludovic Gaudard

PSP (Pumped-storage power plants) represent the only mature option for large-scale electricity storage, and offer a wide range of grid management services, ranging from peak power production to ancillary services. This technology has undergone drastic prog ...

Pergamon-Elsevier Science Ltd2016

Measurement of the Self-Oscillating Vortex Rope Dynamics for Hydroacoustic Stability Analysis

François Avellan, Sébastien Alligné, Keita Yamamoto

Flow instabilities in hydraulic machines often feature oscillating cavitation volumes, which locally introduce compliance and mass flow gain effects. These unsteady characteristics play a crucial role in one-dimensional stability models and can be determin ...

American Society of Mechanical Engineers2016

Development of a finite volume particle method for 3-D fluid flow simulations

François Avellan, Christian Vessaz, Ebrahim Jahanbakhsh, Audrey Paulette Solange Maertens

The Finite Volume Particle Method (FVPM) is a meshless method for simulating fluid flows which includes many of the desirable features of mesh-based finite volume methods. FVPM benefits from particle interaction vectors to weight conservative fluxes exchan ...

Elsevier2016

A mixed standard/custom design strategy to minimize cost and maximize efficiency for picohydro power potential harvesting

François Avellan, Cécile Münch-Alligné, Elena Vagnoni, Loïc Andolfatto

Harvesting the numerous small scale hydroelectric potential is a way to increase the sustainable hydraulic energy production in developed countries. The condition to meet economical profitability with pico power stations - below 25 kW - is to minimize the ...

2015

Analytical hill chart towards the maximisation of energy recovery on water utility networks with counter rotating micro-turbine

François Avellan, Cécile Münch-Alligné, Elena Vagnoni, Loïc Andolfatto, João Nuno Gomes Borga Delgado

Existing water utility networks provides a wide, distributed and unexploited hydropower potential. The installation of energy recovery stations on existing infrastructures limits both the required investment and the environmental impact. The counter-rotati ...

2015

Flow Simulation of Jet Deviation by Rotating Pelton Buckets Using Finite Volume Particle Method

François Avellan, Christian Vessaz, Ebrahim Jahanbakhsh

The objective of the present paper is to perform numerical simulations of a high-speed water jet impinging on rotating Pelton buckets using the finite volume particle method (FVPM), which combines attractive features of smoothed particle hydrodynamics (SPH ...

2015

Analysis of the part load helical vortex rope of a Francis turbine using on-board sensors

François Avellan, Christian Landry, Arthur Tristan Favrel, Keita Yamamoto

The cavitation helical vortex rope arising at Francis turbine partial load induces pressure fluctuations at the rope precession frequency, which can be decomposed into two components; the convective one and the synchronous one. The latter acts as an excita ...

Iop Publishing Ltd2015

Identification of the wave speed and the second viscosity of cavitation flows with 2D RANS computations - Part I

François Avellan, Sébastien Alligné

1D hydro-electric models are useful to predict dynamic behaviour of hydro-power plants. Regarding vortex rope and cavitation surge in Francis turbines, the 1D models require some inputs that can be provided by numerical simulations. In this paper, a 2D cav ...

Iop Publishing Ltd2015

Page 5 sur 11