Validation of the dynamic load characteristics on a Tidal Stream Turbine when subjected to wave and current interaction

Type Article
Acceptance Date 2021-02 IN PRESS
Language English
Author(s) Lloyd Catherine1, Allmark Matthew1, Ordonez-Sanchez Stephanie2, Martinez Rodrigo2, Johnstone Cameron2, Germain Gregory3, Gaurier Benoit, Mason-Jones Allan1, O'Doherty Tim1
Affiliation(s) 1 : Cardiff Marine Energy Research Group, School of Engineering, Cardiff University, Queens Buildings, 14-17, The Parade, Cardiff, CF24 3AA, UK
2 : Energy Systems Research Unit, Department of Mechanical and Aerospace Engineering, University of Strathclyde, 75 Montrose Street, Glasgow, G1 1XQ, UK
3 : IFREMER, Marine and Structures Laboratory, Centre Manche, Mer du Nord, 150 Quai Gambetta, 62200, Boulogne-sur-Mer, France
Source Ocean Engineering (00298018) (Elsevier BV) In Press
DOI 10.1016/j.oceaneng.2020.108360
Keyword(s) Tidal stream turbine, Wave-current interaction, Computational fluid dynamics, Regular waves, Experimental validation, Marine energy
Abstract

A comparison of a tidal turbine's performance and structural loads is conducted using lab-scale numerical models and experimental testing under multiple current-only and wave-current conditions at the IFREMER wave-current flume. Experimental testing, used to validate CFD models, was accomplished using a 0.9 m diameter, 3-bladed tidal turbine and had a blockage ratio of 8% while the turbine was submerged. Initial investigations analysed the performance and loads on the turbine under uniform and profiled current-only conditions. The presence of a profiled velocity gradient was found to have a negligible effect on the average performance characteristics; however, transient thrust, torque and out of plane bending moment loads experienced much greater variations. These load fluctuations were further increased with increasing levels of shear in the velocity profile, while peaks in the turbine loads coincided with its rotational frequency. The addition of regular, Stokes 2nd Order Theory waves added to the complexity of the flow conditions experienced by the turbine. The effect on the average performance characteristics were negligible while the total turbine thrust and torque fluctuations increased by 35 times that of the current-only cases. Peaks in the loads aligned with the wave surface elevation, indicating the importance of transient analyses of dynamic loads.

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Lloyd Catherine, Allmark Matthew, Ordonez-Sanchez Stephanie, Martinez Rodrigo, Johnstone Cameron, Germain Gregory, Gaurier Benoit, Mason-Jones Allan, O'Doherty Tim Validation of the dynamic load characteristics on a Tidal Stream Turbine when subjected to wave and current interaction. Ocean Engineering IN PRESS. Publisher's official version : https://doi.org/10.1016/j.oceaneng.2020.108360 , Open Access version : https://archimer.ifremer.fr/doc/00678/78987/