• français
    • English
    français
  • Login
Help
View Item 
  •   Home
  • Institut de Recherche de l’École navale (IRENAV)
  • View Item
  • Home
  • Institut de Recherche de l’École navale (IRENAV)
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Flow field and forces on a highly curved plate

Communication avec acte
Author
GOULVEN, Thomas
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
BOT, Patrick
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
HABERT, Benoît
13094 Institut de Recherche de l'Ecole Navale [IRENAV]

URI
http://hdl.handle.net/10985/21857
Date
2019-07

Abstract

While both slender wings and bluff bodies are the usual focus of classical fluid dynamics, the behavior of a high-lift not-so-slender body remains somehow original. This work presents an experimental investigation of a high-camber curved thin plate with a sharp leading edge, in a wide range of angle of attack (-10° to 28°), at a Reynolds number of 1:82:105. Forces are measured with a strain-gauge balance and the flow field is determined thanks to time-resolved 2D Particle Image Velocimetry (PIV) in a nominally 2D flow. Despite this very simple geometry, the section generates a high lift and shows a rather original behavior, with characteristics of both bluff and slender lifting bodies. The sectional lift coefficient is estimated by the velocity circulation around the section from the PIV fields. The time-averaged lift computed from the circulation compares reasonably well with the lift measured by the force balance, even in the presence of flow separation. Furthermore, the sectional lift coefficient time series enables a detailed spectral analysis of the flow behavior, highlighting the vortex shedding in the wake. The flow pattern is characterized with a vortex identification method, and the transition between a wing-like flow and bluff-body-like flow is evidenced. It is shown that when the angle of attack exceeds 10°, the lift is sharply increased with a reduction of trailing edge separation, as a consequence of an earlier transition of the boundary layer on the suction side, triggered by separation at the sharp leading edge.

Files in this item

Name:
IRENAV_ISPIV_2019_BOT.pdf
Size:
2.684Mb
Format:
PDF
View/Open

Collections

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

Related items

Showing items related by title, author, creator and subject.

  • Sharp Transition in the Lift Force of a Fluid Flowing Past Nonsymmetrical Obstacles: Evidence for a Lift Crisis in the Drag Crisis Regime 
    Article dans une revue avec comité de lecture
    BOT, Patrick; RABAUD, Marc; THOMAS, Goulven; LOMBARDI, Alessandro; LEBRET, Charles (American Physical Society, 2016)
    Bluff bodies moving in a fluid experience a drag force which usually increases with velocity. However in a particular velocity range a drag crisis is observed, i.e., a sharp and strong decrease of the drag force. This ...
  • Performance enhancement of downwind sails due to leading edge flapping: A wind tunnel investigation 
    Article dans une revue avec comité de lecture
    AUBIN, Nicolas; AUGIER, Benoit; DEPARDAY, Julien; SACHER, Matthieu; BOT, Patrick (Elsevier, 2018)
    This work presents a wind tunnel experimental study on the effect of the leading edge flapping on the aerodynamic performance of a spinnaker. Four J80-class spinnaker models, combining two different assembling structures ...
  • Inviscid approach for upwind sails aerodynamics. How far can we go? 
    Article dans une revue avec comité de lecture
    AUBIN, Nicolas; AUGIER, Benoit; BOT, Patrick; HAUVILLE, Frédéric; FLOCH, Ronan (Elsevier, 2016)
    This work presents a full-scale experimental study of a yacht rig and sails in real upwind sailing conditions and a comparison with Fluid Structure Interaction (FSI) simulations with the ARAVANTI model (Finite Element ...
  • Wind tunnel investigation of dynamic trimming on upwind sail aerodynamics 
    Communication avec acte
    AUBIN, Nicolas; AUGIER, Benoît; BOT, Patrick; HAUVILLE, Frédéric; SACHER, Matthieu; FLAY, Richard (2016)
    An experiment was performed in the Yacht Research Unit’s Twisted Flow Wind Tunnel (University of Auckland) to test the effect of dynamic trimming on three IMOCA 60 inspired mainsail models in an upwind (AWA = 60 ) unheeled ...
  • Modal Analysis of Pressures on a Full-Scale Spinnaker 
    Communication avec acte
    DEPARDAY, Julien; BOT, Patrick; HAUVILLE, Frédéric; AUGIER, Benoit; RABAUD, Marc; MOTTA, Dario; LE PELLEY, David (2016)
    While sailing offwind, the trimmer typically adjusts the downwind sail "on the verge of luffing", letting occasionally the luff of the sail flapping. Due to the unsteadiness of the spinnaker itself, maintaining the luff ...

Browse

All SAMCommunities & CollectionsAuthorsIssue DateCenter / InstitutionThis CollectionAuthorsIssue DateCenter / Institution

Newsletter

Latest newsletterPrevious newsletters

Statistics

Most Popular ItemsStatistics by CountryMost Popular Authors

ÉCOLE NATIONALE SUPERIEURE D'ARTS ET METIERS

  • Contact
  • Mentions légales

ÉCOLE NATIONALE SUPERIEURE D'ARTS ET METIERS

  • Contact
  • Mentions légales