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Article

Experimental Assessment of Flow, Performance, and Loads for Tidal Turbines in a Closely-Spaced Array

1
School of Engineering, Institute for Energy Systems, The University of Edinburgh, Edinburgh EH9 3FB, UK
2
Department of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M13 9PL, UK
*
Authors to whom correspondence should be addressed.
Energies 2020, 13(8), 1977; https://doi.org/10.3390/en13081977
Received: 9 February 2020 / Revised: 27 March 2020 / Accepted: 8 April 2020 / Published: 16 April 2020
(This article belongs to the Section Wind, Wave and Tidal Energy)
Tidal stream turbines are subject to complex flow conditions, particularly when installed in staggered array configurations where the downstream turbines are affected by the wake and/or bypass flow of upstream turbines. This work presents, for the first time, methods for and results from the physical testing of three 1/15 scale instrumented turbines configured in a closely-spaced staggered array, and demonstrates experimentally that increased power extraction can be achieved through reduced array separation. A comprehensive set of flow measurements was taken during several weeks testing in the FloWave Ocean Energy Research Facility, with different configurations of turbines installed in the tank in a current of 0.8 m/s, to understand the effect that the front turbines have on flow through the array and on the inflow to the centrally placed rearmost turbine. Loads on the turbine structure, rotor, and blade roots were measured along with the rotational speed of the rotor to assess concurrently in real-time the effects of flow and array geometry on structural loading and performance. Operating in this closely-spaced array was found to improve the power delivered by the rear turbine by 5.7–10.4% with a corresponding increase in the thrust loading on the rotor of 4.8–7.3% around the peak power operating point. The experimental methods developed and results arising from this work will also be useful for further scale-testing elsewhere, validating numerical models, and for understanding the performance and loading of full-scale tidal stream turbines in arrays. View Full-Text
Keywords: tank testing; tidal stream turbine; array effects; turbine wake measurements tank testing; tidal stream turbine; array effects; turbine wake measurements
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MDPI and ACS Style

Noble, D.R.; Draycott, S.; Nambiar, A.; Sellar, B.G.; Steynor, J.; Kiprakis, A. Experimental Assessment of Flow, Performance, and Loads for Tidal Turbines in a Closely-Spaced Array. Energies 2020, 13, 1977. https://doi.org/10.3390/en13081977

AMA Style

Noble DR, Draycott S, Nambiar A, Sellar BG, Steynor J, Kiprakis A. Experimental Assessment of Flow, Performance, and Loads for Tidal Turbines in a Closely-Spaced Array. Energies. 2020; 13(8):1977. https://doi.org/10.3390/en13081977

Chicago/Turabian Style

Noble, Donald R., Samuel Draycott, Anup Nambiar, Brian G. Sellar, Jeffrey Steynor, and Aristides Kiprakis. 2020. "Experimental Assessment of Flow, Performance, and Loads for Tidal Turbines in a Closely-Spaced Array" Energies 13, no. 8: 1977. https://doi.org/10.3390/en13081977

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