Concept

Flap (aeronautics)

Publications associées (50)

Turbulent vortex shedding from a blunt trailing edge hydrofoil

Placed in a fluid stream, solid bodies can exhibit a separated flow that extends to their wake. The detachment of the boundary layer on both upper and lower surfaces forms two shear layers which generate above a critical value of Reynolds number a periodic ...

EPFL2009

Vortex shedding from blunt and oblique trailing edge hydrofoils

François Avellan, Mohamed Farhat, Philippe Ausoni, Amirreza Zobeiri

The phenomenon of vortex shedding behind a hydrofoil is an important issue from both scientific and technical point of view. The resulting fluctuating forces may lead to excessive vibrations and premature cracks in the hydraulic machines. According to prev ...

Brno university of technology2009

Time based readout of a silicon photomultiplier (SiPM) for Time Of Flight Positron Emission Tomography (TOF-PET)

Thierry Meyer, Matthieu Despeisse, François Eric Powolny

Time of flight (TOF) measurements in positron emission tomography (PET) are very challenging in terms of timing performance, and should achieve ideally less than 100ps FWHM precision. We present a time-based differential technique to read out SiPMs that ha ...

2009

Cavitation Influence on Kármán Vortex Shedding and Induced Hydrofoil Vibrations

François Avellan, Mohamed Farhat, Philippe Ausoni, Eduard Egusquiza

The present study deals with the shedding process of the von Kármán vortices at the trailing edge of a 2D hydrofoil at high Reynolds number. This research focuses mainly on the effects of cavitation and fluid-structure interaction on the mechanism of the v ...

2007

Correction of wandering smoothing effects on static measurements of a wing-tip vortex

Giacomo Valerio Iungo

Wandering is a typical feature of wing-tip vortices and it consists in random fluctuations of the vortex core. Consequently, vortices measured by static measuring techniques appear to be more diffuse than in reality, so that a correction method is needed. ...

Springer Verlag2007

Cavitation in Kármán Vortices and Flow Induced Vibrations

François Avellan, Mohamed Farhat, Philippe Ausoni

The shedding process of the Kármán vortices at the trailing edge of a 2D hydrofoil at high Reynolds numbers is investigated. The focus is put on the effect of the cavitation on the vortex street morphology. A direct insight is also provided on the role of ...

2006

Design of an Ultra-Lightweight Autonomous Solar Airplane for Continuous Flight

Roland Siegwart

Development of unmanned aerial vehicle has attracted attention of several agencies and university laboratories over the past decade, due to their great potential in military and civilian applications. There are a dozen of commercial autopilots which combin ...

2005

Etude de l'influence des instationnarités des écoulements sur le développement de la cavitation

Jean-François Caron

Flows in hydraulic machinery show interactions between guiding and rotating components. The wakes of the fixed components will be part responsible for the pressure fluctuations sensed on the blades. Those fluctuations become more important when the distanc ...

EPFL2002

The influence of flow unsteadiness on erosive cavity dynamics

François Avellan, Mohamed Farhat, Jean-François Caron

This paper presents investigations of unsteady flow conditions influence over cavitation dynamics. Measurements of wall pressure fluctuations in a model turbine are first introduced. It is shown that the wake of the spiral casing tongue modulates cavity dy ...

American Society of Mechanical Engineers1999

Wake flow analysis for a hydrofoil with and without hydroelastic lock-in

François Avellan, Philippe Dupont

The influence of the cavitation level on the vortex shedding frequency is used to compare the flow field in the wake of a blunt hydrofoil, with and without hydroelastic lock-in, and with a constant Reynolds number. Accurate LOA measurements allow us to exa ...

BHRA1987

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