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A New Sensor to Characterize Flow Separation on a Hydrofoil

Communication avec acte
Auteur
VOISIN, Dimitri
SOULIER, Antoine
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
ccBOT, Patrick

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.

  • Characterization of a flow separation sensor on a hydrofoil: the hydro e-telltale 
    Communication avec acte
    ccBOT, 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 ...
  • 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; ccASTOLFI, Jacques Andre; ccBOT, 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 ...
  • Special Issue on Yacht Engineering 
    Direction d'ouvrage
    BOT, Patrick (Ocean Engineering, Elsevier, 2014-11)
    Editorial It is with much pleasure that we write the editorial for this special issue devoted to Yacht Engineering, arising from the 3rd International Conference on Innovation in High Performance Sailing Yachts (Innov’sail ...
  • Proceedings of the 2nd INNOVSAIL conference 
    Direction d'ouvrage
    BOT, Patrick (RINA, 2010)
    2nd International Conference on Innovation for High Performance Sailing Yachts INNOV’SAIL
  • Experimental Study of the Flow in a Compact Heat Exchanger Channel with Embossed-type Vortex Generators 
    Article dans une revue avec comité de lecture
    DUPONT, Frédéric; GABILLET, Céline; ccBOT, Patrick (American Society of Mechanical Engineers, 2003)
    The isothermal flow in a model channel of plate-fin heat exchanger with periodically arranged embossed-like vortex generators is investigated. Velocity measurements are performed by LDA in the transitional regime (Reynolds ...

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