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Energies 2017, 10(4), 497; doi:10.3390/en10040497

Experimental Studies of Turbulent Intensity around a Tidal Turbine Support Structure

1
Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3JD, UK
2
Dipartimento di Ingegneria Civile e Ambientale, Università degli Studi di Firenze, 50139 Firenze, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Terese Løvås
Received: 27 February 2017 / Revised: 31 March 2017 / Accepted: 5 April 2017 / Published: 7 April 2017
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

Tidal stream energy is a low-carbon energy source. Tidal stream turbines operate in a turbulent environment, and the effect of the structure between the turbine and seabed on this environment is not fully understood. An experimental study using 1:72 scale models based on a commercial turbine design was carried out to study the support structure influence on turbulent intensity around the turbine blades. The study was conducted using the wave-current tank at the Laboratory of Maritime Engineering (LABIMA), University of Florence. A realistic flow environment (ambient turbulent intensity = 11%) was established. Turbulent intensity was measured upstream and downstream of a turbine mounted on two different support structures (one resembling a commercial design, the other the same with an additional vertical element), in order to quantify any variation in turbulence and performance between the support structures. Turbine drive power was used to calculate power generation. Acoustic Doppler velocimetry (ADV) was used to record and calculate upstream and downstream turbulent intensity. In otherwise identical conditions, performance variation of only 4% was observed between two support structures. Turbulent intensity at 1, 3 and 5 blade diameters, both upstream and downstream, showed variation up to 21% between the two cases. The additional turbulent structures generated by the additional element of the second support structure appears to cause this effect, and the upstream propagation of turbulent intensity is believed to be permitted by surface waves. This result is significant for the prediction of turbine array performance. View Full-Text
Keywords: marine energy; tidal turbine; horizontal-axis marine current turbine; ocean current turbine; turbulence; support structure; device wake marine energy; tidal turbine; horizontal-axis marine current turbine; ocean current turbine; turbulence; support structure; device wake
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Walker, S.; Cappietti, L. Experimental Studies of Turbulent Intensity around a Tidal Turbine Support Structure. Energies 2017, 10, 497.

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