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Experimental Investigation of Airfoil Subject to Harmonic Translatory Motions

[+] Author Affiliations
Mac Gaunaa, Jens N. So̸rensen

Technical University of Denmark, Lyngby, Denmark

Paper No. WIND2002-35, pp. 133-140; 8 pages
doi:10.1115/WIND2002-35
From:
  • ASME 2002 Wind Energy Symposium
  • ASME 2002 Wind Energy Symposium
  • Reno, Nevada, USA, January 14–17, 2002
  • Conference Sponsors: ASME
  • ISBN: 1-56347-476-X
  • Copyright © 2001 by The American Institute of Aeronautics and Astronautics, Inc. and ASME

abstract

This paper concerns an experimental investigation of a NACA 0015 airfoil subject to harmonic one-degree-of-freedom translatory motion. Specifically, unsteady pressure distributions were measured at a range of incidences and movement directions at reduced frequencies matching real life conditions for the lead-lag motion of wind turbine rotors. From the experimental results, hysteresis loops and aerodynamic damping were computed and compared to results from linear quasi-stationary theory and unsteady potential flow theory. The maximum negative aerodynamic damping was found to take place at moderate stall and an incidence of about 15°, at a movement direction close to the chordwise direction. Comparison with unsteady potential flow theory showed excellent agreement with the experimental data for incidences up to 5°. Linear quasi-stationary theory failed to reproduce the overall features of the aerodynamic damping for incidences above 12°.

Copyright © 2001 by The American Institute of Aeronautics and Astronautics, Inc. and ASME
Topics: Motion , Airfoils

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