Publication
Rotating air-water ring in the vaneless gap of a pump-turbine operating in condenser mode
Related publications (41)
Fiber pumps for wearable fluidic systems
Herbert Shea, Michael James Henry Smith, Vito Cacucciolo
Incorporating pressurized fluidic circuits into textiles can enable muscular support, thermoregulation, and haptic feedback in a convenient wearable form factor. However, conventional rigid pumps, with their associated noise and vibration, are unsuitable f ...
2023Experimental investigation and analysis of sequential jet impingement concepts for enhanced turbine cooling
With the future decarbonization of the electricity production, gas turbines will be an important tool for the stabilization of the electricity grid by meeting the peak of energy demand using zero-carbon fuels like synthetic gas and hydrogen.The combustion ...
EPFL2021Oxygen diffusion through air–water free surfaces in a pump–turbine operating in condenser mode
François Avellan, Elena Vagnoni, Loïc Andolfatto, Pierre Leroy
The present research aims at understanding the mass transfer of air into water in a reversible pump turbine operating in condenser mode. In particular, the diffusion of oxygen through the water free-surface both in the vaneless gap between the impeller bla ...
2019Two-phase flow phenomena in hydraulic turbines and pump-turbines operating in synchronous condenser mode
Hydraulic turbines and pump-turbines are often required to operate in particular conditions at which they consume active power. To keep the power consumption at a minimum, it is necessary to dewater the runner to reduce the mechanical torque. One of these ...
EPFL2018Pumps running as turbines for energy recovery in water supply systems
Pressurised water supply systems are infrastructures that offer a potential for energy recovery in locations where these systems operate with an excessive pressure. The integration of micro hydropower plants for energy recovery is a challenge, as these sys ...
EPFL2018Interaction 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 ...
2018Experimental investigation of the sloshing motion of the water free surface in the draft tube of a Francis turbine operating in synchronous condenser mode
François Avellan, Elena Vagnoni, Arthur Tristan Favrel, Loïc Andolfatto
Hydropower units may be required to operate in condenser mode to supply reactive power. In this operating mode, the water level in the turbine or pump-turbine is decreased below the runner by closing the guide vanes and injecting pressurized air. While ope ...
2018Effect of spilling from adjacent orifices on the velocity field and pressures in front of needle stop-logs
Giovanni De Cesare, Azin Amini, Cédric Bron, Ivan Stojnic
In this study, the effect of spilling from neighboring sluice gates on stop-logs was experimentally investigated on a 1:65 physical scale model comprised of a double arch dam, a reservoir area, six spillway orifices and two stop-logs. Two types of measurem ...
2018Experimental evidence of inter-blade cavitation vortex development in Francis turbines at deep part load condition
François Avellan, Arthur Tristan Favrel, Keita Yamamoto
Francis turbines are subject to various types of cavitation flow depending on the operating condition. To enable a smooth integration of the renewable energy sources, hydraulic machines are now increasingly required to extend their operating range, especia ...
Springer Verlag2017On 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 ...
2017