Experiments in Fluids

, 47:579 | Cite as

Flow structure on a three-dimensional wing subjected to small amplitude perturbations

  • T. O. Yilmaz
  • Donald Rockwell
Research Article


Small amplitude angular perturbations, of the order of one-half degree, can substantially modify the flow structure along a three-dimensional wing configuration, which is quantitatively characterized using a technique of high-image-density particle image velocimetry. Excitation at either the fundamental or the first subharmonic of the spanwise-averaged instability frequency of the separating shear layer from the stationary wing nearly eliminates the large-scale separation zone along the wing at high angle of attack. The physics of the flow is interpreted in terms of time-mean streamlines, vorticity and Reynolds stress, in conjunction with phase-averaged patterns of instantaneous vorticity. Distinctive vorticity patterns occur along the leading edge when the time-averaged separation zone is minimized.


Vorticity Particle Image Velocimetry Excitation Frequency Delta Wing Separate Shear Layer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors gratefully acknowledge the support of the Air Force Office of Scientific Research under grants monitored by Lt. Col. Rhett Jefferies and Dr. John Schmisseur.


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Department of Mechanical Engineering and MechanicsLehigh UniversityBethlehemUSA

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