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°.
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ASME 2002 Wind Energy Symposium
January 14–17, 2002
Reno, Nevada, USA
Conference Sponsors:
- ASME
ISBN:
1-56347-476-X
PROCEEDINGS PAPER
Experimental Investigation of Airfoil Subject to Harmonic Translatory Motions
Mac Gaunaa,
Mac Gaunaa
Technical University of Denmark, Lyngby, Denmark
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Jens N. So̸rensen
Jens N. So̸rensen
Technical University of Denmark, Lyngby, Denmark
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Mac Gaunaa
Technical University of Denmark, Lyngby, Denmark
Jens N. So̸rensen
Technical University of Denmark, Lyngby, Denmark
Paper No:
WIND2002-35, pp. 133-140; 8 pages
Published Online:
February 24, 2009
Citation
Gaunaa, M, & So̸rensen, JN. "Experimental Investigation of Airfoil Subject to Harmonic Translatory Motions." Proceedings of the ASME 2002 Wind Energy Symposium. ASME 2002 Wind Energy Symposium. Reno, Nevada, USA. January 14–17, 2002. pp. 133-140. ASME. https://doi.org/10.1115/WIND2002-35
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