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A New Sensor to Characterize Flow Separation on a Hydrofoil

Communication avec acte
Auteur
BOT, Patrick
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
VOISIN, Dimitri
SOULIER, Antoine
ASTOLFI, Jacques-André
13094 Institut de Recherche de l'Ecole Navale [IRENAV]

URI
http://hdl.handle.net/10985/21858
DOI
10.2218/marine2021.6779
Date
2021

Résumé

The performance of lifting bodies such as hydrofoils is determined by the flow state and particular attention should be paid to flow separation, as this greatly affects the generated lift and drag. Sailors are used to look at telltales (woolies) to trim their sails or steer their yacht. A French company developed an electronic telltale for sails based on a strain gauge activated by a silicon strand, with the appropriate signal processing to deliver the same information as a classical wool-made telltale, basically attached or separated flow. This new sensor proved useful when woolies are not visible or to deliver a signal to feed a control system, such as the autopilot for example. It was also applied to wind turbines to control the blade pitch. Mer Agit\'ee is now developing an equivalent hydrodynamic e-Telltale to be used on hydrofoils and rudders to help trimming and controlling. The present work presents the investigation of a foil section fitted with this new sensor in a water tunnel, combining force and PIV measurements with the sensor signal, on a wide range of angle of attack. Results show that the hydro e-Telltale enables detecting the flow separation and anticipate stall, and possibly allows for detecting the boundary layer transition to turbulence. In many cases of fluid flow over a lifting body, it is interesting to get some real-time feedback from the flow in order to help optimizing performance and controlling the system. The feedback from this new sensor could be used in a closed-loop controlling system, for example feeding a reduced-order model of the flow around the foil.

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  • Institut de Recherche de l’École navale (IRENAV)

Documents liés

Visualiser des documents liés par titre, auteur, créateur et sujet.

  • Vortex Induced Vibration Analysis of a Cantilevered Hydrofoil by Laser Vibrometry and TR-PIV 
    Communication avec acte
    ASTOLFI, Jacques-André; BOT, Patrick; LEROY, Laure (X. Amandolese & P. Hémon, 2020-05)
    The structural response of a steel cantilevered hydrofoil is analyzed through an experiment carried out in a hydrodynamic tunnel for Reynolds numbers ranging from 2 105 to 8:25 105. The hydrofoil is set at a 17 angle to ...
  • CHARACTERIZATION OF A FLOW SEPARATION SENSOR ON A HYDROFOIL: THE HYDRO E-TELLTALE 
    Communication avec acte
    BOT, Patrick; ALAS, Rémi; VOISIN, Dimitri; SOULIER, Antoine; BRAUD, Caroline; MARCILLAT, Paul; PEZERIL, Baudoin; D'ARCO, François (HPYD, 2021)
    The performance of lifting bodies such as hydrofoils is determined by the flow state and particular attention should be paid to flow separation, as this greatly affects the generated lift and drag. Sailors are used to look ...
  • Discontinuity of lift on a hydrofoil in reversed flow for tidal turbine Application 
    Article dans une revue avec comité de lecture
    MARCHAND, Jean-Baptiste; ASTOLFI, Jacques Andre; BOT, Patrick (Elsevier, 2017)
    This work presents an experimental investigation of a hydrofoil in reversed flow configuration in the context of marine current turbine development. Experiments consist in hydrodynamic force measurements and PIV flow ...
  • Nonlinear disturbance evolution in a two-dimensional boundary layer along an elastic plate and induced radiated sound 
    Article dans une revue avec comité de lecture
    GOBERT, Marie-Laure; EHRENSTEIN, Uwe; ASTOLFI, Jacques Andre; BOT, Patrick (Elsevier, 2010)
    The interaction between a boundary-layer flow and an elastic plate is addressed by direct numerical simulation, taking into account the full coupling between the fluid flow and the flexible wall. The convectively unstable ...
  • Cycloidal Dynamic Propulsion or Positioning System For a Ship 
    Brevet
    DAMAY, Thomas; HAUVILLE, Frédéric; ASTOLFI, Jacques-André (Patent Application Publication, 2022-03-03)
    A cycloidal dynamic propulsion or positioning system for a ship in water that exhibits a direction of flow, including a frame, a rotor mounted to be movable in rotation on the frame about a main axis at right angles to the ...

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