Personne
Loïc Andolfatto
Cette personne n’est plus à l’EPFL
Publications associées (28)
Rotating air-water ring in the vaneless gap of a pump-turbine operating in condenser mode
François Avellan, Elena Vagnoni, Loïc Andolfatto, Pierre Leroy
The rotating air-water ring, featuring a bubbly flow, in the vaneless gap of a reduced scale physical model of a pump-turbine operating in dewatered condition is investigated. High speed visualizations are performed together with pressure fluctuation measu ...
2018Interaction of a rotating two-phase flow with the pressure and torque stability of a reversible pump-turbine operating in condenser mode.
François Avellan, Elena Vagnoni, Loïc Andolfatto, Pierre Leroy
The operation of a reversible pump-turbine in condenser mode requires to dewater the impeller by closing the guide vanes and injecting compressed air in the draft tube cone to reduce the friction torque on the impeller blades. A water discharge is injected ...
2018On the sloshing free surface in the draft tube cone of a Francis turbine operating in synchronous condenser mode
François Avellan, Elena Vagnoni, Loïc Andolfatto
Hydropower plants may be required to operate in synchronous condenser mode in order to supply reactive power to the grid for compensating the fluctuations introduced by the intermittent renewable energies such wind and solar. When operating in this mode, t ...
2017Toward design optimization of a Pelton turbine runner
François Avellan, Loïc Andolfatto, Christian Vessaz, Christophe Tournier
The objective of the present paper is to propose a strategy to optimize the performance of a Pelton runner based on a parametric model of the bucket geometry, massive particle based numerical simulations and advanced optimization strategies to reduce the d ...
Springer Verlag2017Comprehensive power loss modelling to improve the performance of an Energy Recovery Station for water utility networks
François Avellan, Cécile Münch-Alligné, Loïc Andolfatto, Daniel Biner
The work presented in this paper details the methodology applied to inventory and estimate the power losses in a micro-turbine with counter-rotating runners. The separation between the impact of design parameters and operational parameters on each identifi ...
Pennwell2017Engineering & Performance of DuoTurbo: Microturbine with Counter-Rotating Runners
François Avellan, Loïc Andolfatto, Vlad Hasmatuchi, 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 Research2016Evaluation of the shape deviation of non rigid parts from optical measurements
This paper deals with an approach to identify geometrical deviations of flexible parts from optical measurements. Each step of the approach defines a specific issue which we try to respond to. The problem of measurement uncertainties is solved using an ori ...
Springer Verlag2016Simulation of energy recovery on water utility networks by a micro-turbine with counter-rotating runners
François Avellan, Elena Vagnoni, Cécile Münch-Alligné, Loïc Andolfatto, Vlad Hasmatuchi
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 Research2016Automated hill chart modeling procedure to estimate the performance of double regulated units
François Avellan, Loïc Andolfatto, Henri-Pascal Mombelli
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 ...
2016A mixed standard/custom design strategy to minimize cost and maximize efficiency for picohydro power potential harvesting
François Avellan, Elena Vagnoni, Cécile Münch-Alligné, 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