Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session D06: Energy Harvesting and Power Generation II
2:30 PM–4:40 PM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B208
Chair: Kiran Bhaganagar, University of Texas at San Antonio
Abstract ID: BAPS.2018.DFD.D06.1
Abstract: D06.00001 : Vortex and Wake-Induced Vibrations of Vertical-Axis Wind Turbine Blades*
2:30 PM–2:43 PM
Presenter:
Bridget Benner
(Univ of Mass - Amherst)
Authors:
Bridget Benner
(Univ of Mass - Amherst)
Daniel W Carlson
(Univ of Mass - Amherst)
Banafsheh Seyed-Aghazadeh
(Miami University)
Yahya Modarres-Sadeghi
(Univ of Mass - Amherst)
We present a series of experimental results to investigate vortex and wake-induced vibrations of an airfoil used in vertical-axis wind turbines (VAWTs). The experiments were conducted in both a re-circulating water tunnel and wind tunnel to study the response of a flexibly-mounted NACA 0021 airfoil, which is used in some designs of VAWTs. The airfoil was free to oscillate in the crossflow direction, and tests were conducted in a Reynolds number range of 600<Re<13,300 and reduced velocity range of 0.6<U*<13. The amplitudes of oscillations and flow forces acting on the airfoil were measured over the entire possible range of angles of attack, 0°<α<180°. In the VIV case, the airfoil was observed to oscillate in the range of 60°<α<130°, where α=90° exhibited the widest lock-in range and peak amplitude. For all cases where oscillations were observed, the oscillation frequency remained close to the structure's natural frequency, defining a lock-in range. Flow visualization tests were also conducted to study the changes in vortex shedding patterns, especially between symmetrical angles of attacks about α=90°.
*This work is supported in part by the National Science Foundation under NSF award numbers 1460461 and CBET-1437988.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.D06.1
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