Sea states influence on the behaviour of a bottom mounted full-scale twin vertical axis tidal turbine

Type Article
Date 2022-12
Language English
Author(s) Moreau MartinORCID1, 2, Germain GregoryORCID1, Maurice Guillaume2, Richard AloïsORCID2
Affiliation(s) 1 : Ifremer, Marine Hydrodynamic Laboratory, LHyMar, 150 Quai Gambetta, 62200 Boulogne-sur-Mer, France
2 : HydroQuest SAS, 16 Chemin de Malacher, 38240 Meylan, France
Source Ocean Engineering (0029-8018) (Elsevier BV), 2022-12 , Vol. 265 , P. 112582 (13p.)
DOI 10.1016/j.oceaneng.2022.112582
WOS© Times Cited 7
Keyword(s) Tidal energy, Vertical axis turbine, Cross-flow, In-situ measurement, Waves effect

As only a few tidal turbine developers have reached full-scale installation, the community lacks clear feedback on the validity of development tools to predict in-situ behaviour. From 2019 to 2021, HydroQuest tested its first 1 MW capacity bottom mounted twin vertical axis tidal turbine (VATT) OceanQuest at the Paimpol-Bréhat site, off the coast of Brittany, France. Thus, two years of operational data are available to analyse the behaviour of the full-scale VATT at sea. After describing the environmental conditions and the average performance of the machine, the wave effect on the turbine response is studied. The presence of strong waves multiplies almost by a factor 3 the fluctuation intensities of the torque, the rotational speed of the rotors and the turbine drag, without affecting significantly the mean quantities. The strong coherence between the loads and velocity spectra in the wave frequencies range indicates that the increase of fluctuation intensities is directly due to the periodic loads of surface waves.

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