Publications by Nicolas Jean François Pascal Ghislain Adam

Design of orifices for throttled surge tanks

Giovanni De Cesare, Anton Schleiss, Nicolas Jean François Pascal Ghislain Adam

Orifices can be used for throttling surge tanks, which allows for increased design discharge at existing powerplants without significant geometrical modifications. To improve knowledge about the behaviour of orifices and their cavitation risk, a systematic ...

2021

Holistic Design Approach of a Throttled Surge Tank: The Case of Refurbishment of Gondo High-Head Power Plant in Switzerland

Giovanni De Cesare, Samuel Luke Vorlet, Nicolas Jean François Pascal Ghislain Adam, Mona Seyfeddine

In order to increase the installed capacity, the refurbishment of Gondo high-head power plant required a modification of the existing surge tank by installing a throttle at its entrance. In a previous study, the geometry of this throttle was optimized by p ...

2020

Hybrid modeling and design review of throttled surge tanks

Giovanni De Cesare, Bernard Valluy, Samuel Luke Vorlet, Nicolas Jean François Pascal Ghislain Adam, Mona Seyfeddine

The 2050 Swiss Energy Strategy aims to increase the annual production of hydroelectricity by 4% while 90% of the technically feasible potential is already used. The flexibility of high-head storage power plants (HPP), the main pillar of Swiss peak electric ...

2020

Influence of geometrical parameters of chamfered or rounded orifices on head losses

Giovanni De Cesare, Anton Schleiss, Nicolas Jean François Pascal Ghislain Adam

Orifices are largely used in pipeline systems. The most common application is to measure the discharge of the water flowing through. However, orifices may be used to adapt hydroelectric power plants submitted to moderate increase of installed generation ca ...

Taylor & Francis Ltd2019

Design of a Throttled Surge Tank for Refurbishment by Increase of Installed Capacity at a High-Head Power Plant

Giovanni De Cesare, Bernard Valluy, Anton Schleiss, Nicolas Jean François Pascal Ghislain Adam

The Swiss confederation aims to phase out nuclear power production with its Energy Strategy 2050 program by increasing the renewable energy contribution to its overall energy generation. Hydroelectricity, which is the most important form of renewable energ ...

American Society of Civil Engineers2018

Dimensionnement des orifices pour étranglement des cheminées d’équilibre

Giovanni De Cesare, Anton Schleiss, Nicolas Jean François Pascal Ghislain Adam

Les orifices sont utilisés dans divers domaines de l’hydraulique par exemple pour des étranglements au pied de cheminées d’équilibre sans modification constructive de la cheminée d’équilibre. Dans ce cas, un orifice permet d’adapter un aménagement hydroéle ...

2018

Characterization of hydraulic behavior of orifices in conduits

Nicolas Jean François Pascal Ghislain Adam

High-head power plants are the main pillar of Swiss peak electricity production. With the 2050 Energy Strategy approved by Swiss voters, the annual production of hydroelectricity should increase by 4%, while 90% of the technically feasible potential is alr ...

EPFL2017

Head losses and influence length of sharp-edged and rounded orifices under steady flow conditions

Giovanni De Cesare, Anton Schleiss, Nicolas Jean François Pascal Ghislain Adam

Orifices have been largely studied either for flow metering or for producing head losses. An orifice which is used as a flow meter is well defined in ISO 5167. All the geometrical parameters are defined to obtain discharges as accurate as possible. However ...

2017

Head loss coefficient through sharp-edged orifices

Giovanni De Cesare, Anton Schleiss, Cécile Münch-Alligné, Nicolas Jean François Pascal Ghislain Adam

Nowadays, high-head power plants could increase their installed power capacity for many reasons, e.g. dam heightening, increase of their peak power capacity or refurbishment with new turbines. Frequently, due to several considerations, e.g. topographical o ...

2016

Experimental assessment of head losses through elliptical and sharp-edged orifices

Giovanni De Cesare, Anton Schleiss, Nicolas Jean François Pascal Ghislain Adam

Due to the European electricity market liberalization and the appearance of other renewable electricity producers, an increase of installed peak power capacity is relevant to provide larger amount of electricity in a shorter turbine duration. When the disc ...

2016

Non-intrusive flow velocity measurements in pressurized pipe with orifice

Giovanni De Cesare, Anton Schleiss, Nicolas Jean François Pascal Ghislain Adam

Orifices are hydraulic devices producing pressure drops or head losses in pipes ways. Flow velocity measurements at the upstream of orifices allow understanding the effect of given flow field on head losses, while downstream measurements provide informatio ...

2016