Phase Plane Analysis for Nonlinear Oscillation of Bodies at High Angles of Attack

  • T. Yoshinaga
  • A. Tate
  • K. Inoue
Conference paper
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)


A phase plane analysis is successfully applied to nonlinear angular oscillation and rotation of two-dimensional bodies at high angles of attack to obtain the analytical expression of the moment acting on the bodies in unsteady free rotation tests. The analytical expression of the moment is useful to investigate the energy exchange between the bodies and flow. By integration it reproduces angular motions close to those observed in wind tunnel tests. In the following article the method and results are explained for the autorotation of two-dimensional bodies in a wind tunnel by a free-rotation method at Reω~.3.5 × l04.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1993

Authors and Affiliations

  • T. Yoshinaga
    • 1
  • A. Tate
    • 1
  • K. Inoue
    • 2
  1. 1.Aerodynamics DivisionNational Aerospace LaboratoryTokyoJapan
  2. 2.Department of Electrical and Electronics EngineeringFukui UniversityFukuiJapan

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