Publications by Nicolas Jean François Pascal Ghislain Adam

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Hybrid modeling and design review of throttled surge tanks

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

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

Anton Schleiss, Giovanni De Cesare, 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 ...

2019

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

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

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

Anton Schleiss, Giovanni De Cesare, 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 hydroélectrique existant à une augmentation modérée de débit. Une étude systématique a permis d’améliorer la connaissance de ces orifices du point vue de leur comportement asymétrique, vis-à-vis de la cavitation ou de leurs longueurs caractéristiques. Ces différents comportements ont été évalués en détail afin d’en tirer des relations empiriques permettant de caractériser chaque géométrie d’orifice du point de vue de pertes de charge cibles et du risque de cavitation. L’établissement d’un catalogue interactif sur la base des essais physiques et numériques permet aux ingénieurs de trouver une géométrie correspondant aux pertes de charge souhaitées obtenues par l’analyse umérique du comportement transitoire du système d’adduction d’eau de l’aménagement hydroélectrique.

2018

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

Anton Schleiss, Giovanni De Cesare, 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

Anton Schleiss, Giovanni De Cesare, 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

Surge tank throttles for safe and flexible operation of storage plants

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

Throttle surge tanks are a part of high head powerplants. The main consequence of a throttle placement is to introduce head losses by accelerating the flow. They make it possible to manage extreme water levels during mass oscillations while increasing wate ...

2016