Concept

Moteur hydraulique

Publications associées (27)

Optimization of a Shared Tailrace Channel of Two Pumped-Storage Plants by Physical and Numerical Modeling

Giovanni De Cesare, Martin Peter Bieri, Stéphane Christian Olivier Terrier, Sylvain Candolfi

Pump and turbine operations lead to head losses in the tailrace channel. Pumping discharge may be limited due to potential air entrainment into the pump shaft when the downstream reservoir is at its lowest level and the head losses are too high. Regarding ...

2014

Flow and waves in a common tailrace channel of two pump-storage plants - physical and numerical simulation

Giovanni De Cesare, Martin Peter Bieri, Stéphane Christian Olivier Terrier, Sylvain Candolfi

2012

Efficient runner safety assessment during early design phase and root cause analysis

Olivier Braun

Fatigue related problems in Francis turbines, especially high head Francis turbines, have been published several times in the last years. During operation the runner is exposed to various steady and unsteady hydraulic loads. Therefore the analysis of force ...

International Association For Hydraulic Research2012

Effect of drop in pipe wall stiffness on water-hammer speed and attenuation

Anton Schleiss, Fadi Hachem

The effect of local drop of wall stiffness in pressurized waterways on the pressure wave speed and the wave attenuation during transients is investigated experimentally. A new signal-processing procedure to identify the presence of a weak reach is introduc ...

2012

Monitoring of steel-lined pressure shafts using water-hammer records and wavelet filtering and decomposition

Anton Schleiss, Fadi Hachem

The failure of steel liner of pressure shafts of hydropower plants can have catastrophic consequences. The partial or total loss of the liner support’s rigidity is characterized by a local change of the hydro-acoustic properties and creates reflection boun ...

2011

The facilitation of mini and small hydropower in Switzerland through institutional mechanisms

Matthias Finger, Nicolas Crettenand

Within the context of the liberalisation of the electricity sector, the government’s aim to increase renewable energy sources and post-Kyoto regulation, this paper aims to identify and develop institutional mechanisms to facilitate mini and small hydropowe ...

2010

High Speed Flow Visualisation of an Impinging Jet on a Pelton Turbine Bucket

François Avellan, Mohamed Farhat, Alexandre Perrig

This paper deals with flow investigations using endoscopes in a single-injector reduced scale Pelton turbine performed with a CMOS high-speed camera. Both onboard and external visualizations techniques of the flow in a bucket are presented. The flow observ ...

ASME2007

Hydrodynamics of the free surface flow in Pelton turbine buckets

Alexandre Perrig

The design of Pelton turbines has always been more difficult than that of reaction turbines, and their performances lower. Indeed, the Pelton turbines combine 4 types of flows: (i) confined, steady-state flow in the piping systems and injector, (ii) free w ...

EPFL2007

Analysis of large scale hydrodynamic phenomena in turbine draft tubes

Monica Iliescu

Hydraulic power is a renewable energy with a very advantageous price, and its flexibility of use coupled with its storage possibilities easily enables to meet the peak demand. Refurbishment of old hydraulic power plants is an important topical issue and th ...

EPFL2007

Flow in a Pelton Turbine Bucket: Numerical and Experimental Investigations

François Avellan, Mohamed Farhat, Alexandre Perrig

The aim of the paper is to present the results of investigations conducted on the free surface flow in a Pelton turbine model bucket. Unsteady numerical simulations, based on the two-phase homogeneous model, are performed together with wall pressure measur ...

2006

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