Concept

Low-head hydro power

Related publications (60)

An innovative Inductive Air-Gap Monitoring System for Large Low Speed Hydro-Generators

Jean-Jacques Simond, Mai Tu Xuan, Roland Wetter

Large low speed hydro-generators (Fig. 1) have a very small specific air-gap to stator bore diameter ratio making it virtually impossible to have a perfect centering of the rotor within the stator during the assembly process. Therefore the machines are ope ...

2008

Maximum Efficiency Point Tracking for Adjustable-Speed Small Hydro Power Plant

Mario Paolone

The paper presents the general scheme and the relevant implementation of a Maximum Efficiency Point Tracking (MEPT) system for a Small Hydro Power (SHP) plant equipped with a variable-speed generator. This last consists of a Doubly Fed Induction Generator ...

2008

Analysis of the Cavitating Draft Tube Vortex in a Francis Turbine Using Particle Image Velocimetry Measurements in Two-Phase Flow

François Avellan, Monica Iliescu

Partial flow rate operation of hydroturbines with constant pitch blades causes complex unstable cavitating flow in the diffuser cone. A particle image velocimetry (PIV) system allows investigating the flow velocity field in the case of a developing cavitat ...

2008

Unsteady CFD Prediction of von Kármán Vortex Shedding in Hydraulic Turbine Stay Vanes

François Avellan, Mohamed Farhat, Philippe Ausoni

All hydraulic turbines containing a casing with stay vanes face the potential dynamic problem of stay vane von Kármán vortex shedding. For hydraulic efficiency purposes the stay vanes tend to be relatively slender in the direction normal to the flow thus b ...

2007

Assessing the role of the uncertainty in stream-flows and system's target reliability in water resource design of a hydro power system

Roham Bakhtyar

The role of the level of reliability of meeting a desired hydropower system's firm energy yield and quantifying the uncertainty of stream-flows in design components of a hydro-electric project is assessed in this study. Sequential stream flow routing (SSR) ...

2007

Tool Path Generation and Post-Processor Issues in Five-Axis High Speed Machining of Hydro Turbine Blades

François Avellan, Christophe Tournier

This paper deals with 5-axis milling of hydraulic blades. The issue developed is essentially linked to problems due to the transition from 3 to 5 axes. A specific attention is done to the Inverse Kinematics Transformation (IKT) which can be source of incoh ...

2006

A Novel Air-Gap Monitoring System For Large Low Speed Hydro-Generators.

Jean-Jacques Simond, Mai Tu Xuan, Roland Wetter, Stefan Keller

This paper describes a novel and patented air-gap monitoring system for large low speed synchronous hydro-generators. This new system is based on inductive sensors, it is able to measure in real time a static or a dynamic rotor eccentricity, a stator or a ...

2006

Cavitation Erosion Prediction in Hydro Turbines from Onboard Vibrations

François Avellan, Mohamed Farhat, Eduard Egusquiza

The current work intends to improve the cavitation erosion prediction methodology in hydro turbines by the use of onboard vibration measurements taken on the rotating shaft. For that, a measuring campaign in two similar Francis turbine prototypes has been ...

International Association For Hydraulic Research2004

Identification and Modeling of Pressure Fluctuations of a Francis Turbine Scale Model at Part Load Operation

François Avellan, Christophe Nicolet

Scale model of high specific speed Francis turbines may present at upper part load operation under low cavitation number pressure fluctuation in the range 2 to 4 times fn, the rotating frequency. In the framework of the FLINDT project, pressure measurement ...

International Association For Hydraulic Research2004

Wall Friction and Boundary Layer Development in the Cone of a Francis Turbine Scale Model

François Avellan, Elena Berca

To characterize the boundary layer development, in the cone of the Francis turbine, wall friction and velocity measurements are performed. The mean wall friction measurements evidence the increasing risk of the boundary layer separation at the cone wall wi ...

International Association For Hydraulic Research2004

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