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Wind-tunnel pressure measurements on model-scale rigid downwind sails

Communication avec acte
Auteur
ccBOT, Patrick
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
VIOLA, Ignazio Maria
252912 Newcastle University [Newcastle]
FLAY, Richard G.J.
160272 University of Auckland [Auckland]
BRETT, Jean-Sébastien

URI
http://hdl.handle.net/10985/14915
Date
2013

Résumé

This paper describes an experiment that was carried out in the Twisted Flow Wind Tunnel at The University of Auckland to measure a detailed set of pressure distributions on a rigid 1/15th scale model of a modern asymmetric spinnaker. It was observed that the pressures varied considerably up the height of the spinnaker. The fine resolution of pressure taps allowed the extent of leading edge separation bubbles, pressure recovery region, and effect of sail curvature to be observed quite clearly. It was found that the shape of the pressure distributions could be understood in terms of conventional aerodynamic theory. The sail performed best at an apparent wind angle of about 55°, which is its design angle, and the effect of heel was more pronounced near the head than the foot.

Fichier(s) constituant cette publication

Nom:
IRENAV_INNOVSAIL_12_2013_BOT.pdf
Taille:
1.378Mo
Format:
PDF
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  • Institut de Recherche de l’École navale (IRENAV)

Documents liés

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

  • Wind-tunnel pressure measurements on model-scale rigid downwind sails 
    Article dans une revue avec comité de lecture
    ccBOT, Patrick; VIOLA, Ignazio Maria; FLAY, Richard G.J.; BRETT, Jean-Sébastien (Elsevier, 2014)
    This paper describes an experiment that was carried out in the Twisted Flow Wind Tunnel at The University of Auckland to measure a detailed set of pressure distributions on a rigid 1/15th scale model of a modern asymmetric ...
  • Turbulent flow around circular arcs 
    Article dans une revue avec comité de lecture
    SOUPPEZ, Jean-Baptiste R.G.; ccBOT, Patrick; VIOLA, Ignazio Maria (AIP Publishing, 2022)
    The flow around a circular arc is governed by the effect of the sharp leading edge and the arc’s curvature. There is a range of incidences where a leading-edge separation bubble (LESB) is formed on the convex side of the ...
  • On the Effect of the Leading-Edge Separation Bubble on the Aerodynamics of Spinnakers 
    Communication avec acte
    SOUPPEZ, Jean-Baptiste R.G.; ccBOT, Patrick; VIOLA, Ignazio Maria (RINA NZ, 2021-03)
    The spinnaker is the most powerful and one of the most used sails both in racing and cruising - yet its complex aerodynamics governed by flow separation is still not fully understood. While the flow around a spinnaker is ...
  • Experimental Investigation of Asymmetric Spinnaker Aerodynamics Using Pressure and Sail Shape Measurements 
    Article dans une revue avec comité de lecture
    MOTTA, Dario; FLAY, Richard G.J.; RICHARDS, P.J.; LE PELLEY, David; DEPARDAY, Julien; ccBOT, Patrick (Elsevier, 2014)
    An innovative method combining simultaneous on-water pressure and sail shape measurements for determining aerodynamic forces produced by sails is described and used on Stewart 34 and J80 Class yachts flying asymmetric ...
  • Aerodynamics of a highly cambered circular arc aerofoil : experimental investigations 
    Communication avec acte
    FLAY, Richard G.J.; PIARD, Arthur; ccBOT, Patrick (2017)
    While the aerodynamics of upwind sails are relatively well understood, flows past downwind sails are still very challenging. Indeed, downwind sails which can be considered as highly cambered thin wing profiles, are well ...

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