Vortex Lift at a Very High Angle of Attack with Massively Separated Unsteady Flow

  • Jain-Ming Wu
  • Jie-Zhi Wu
Conference paper
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)


Massive unsteady flow separation is inevitable as the angle of attack increases to a very high level. Very high lift is liard to achieve with todays existing wing configurations. Introducing controlled unsteady flow to modulate natural and disordered unsteadiness can break through this “unsteady separation barrier.” But the control must integrate with novel designs of wing configuration for basic steady flow. Some configurations may work well only after excitation is imposed. Such an integration falls into the general category of vortex control. In this paper, the underlying physics for steady and unsteady vortex controls relevant to high lift are addressed. Requirements for possible basic wing configurations pertinent to unsteady excitations and the recent progress of vortex control by forcing waves are addressed and reviewed. We believe that a certain combination of advanced excitation techniques and special wing configurations that provide a comfortable “seat” for lift-producing vortices and “room” for wave-vortex resonance will bring a new generation of aeronautical flow type.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1993

Authors and Affiliations

  • Jain-Ming Wu
    • 1
  • Jie-Zhi Wu
    • 1
  1. 1.The University of Tennessee Space InstituteTullahomaUSA

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