Original language | English |
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Number of pages | 2 |
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Publication status | Published - Mar 2016 |
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Event | 5th Oxford Tidal Energy Workshop - Oxford, United Kingdom Duration: 21 Mar 2016 → 22 Mar 2016 |
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Conference | 5th Oxford Tidal Energy Workshop |
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Country | United Kingdom |
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City | Oxford |
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Period | 21/03/16 → 22/03/16 |
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The wave induced hydrodynamics of rigid and flexible foils are investigated by means of experimentation, including Particle Image Velocimetry (PIV), and analytically through Theodorsen’s unsteady loading theory. High-amplitude high-frequency fluctuations were investigated in order to explore extreme flow fluctuations, which cannot be matched by a pitch control system, and to assess the limits of Theodorsen’s linear approach. We found a strong non-linear interaction between the separated boundary layer and the trailing edge vortex, with circulation counter to the bounded case present. This resulted in low lift-to-drag ratio (i.e. low efficiency) and poor agreement between Theodorsen and experiments for the rigid foil. Conversely, the flexible foil was very promising: preventing large flow separation, it resulted in 25% higher lift-to-drag ratio, 30% lower flow fluctuations and reasonable agreement with Theodorsen’s prediction.
21/03/16 → 22/03/16
Oxford, United Kingdom
Event: Conference
ID: 24359253