A Phenomenological Study of Lab-Scale Tidal Turbine Loading under Combined Irregular Wave and Shear Flow Conditions

Type Article
Date 2021-06
Language English
Author(s) Allmark MatthewORCID1, Martinez Rodrigo2, Ordonez-Sanchez StephanieORCID2, Lloyd Catherine1, O’doherty TimORCID1, Germain GregoryORCID3, Gaurier BenoitORCID3, Johnstone Cameron2
Affiliation(s) 1 : Cardiff Marine Energy Research Group, College of Physical Sciences and Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK
2 : Energy Systems Research Unit, Department of Mechanical and Aerospace Engineering, University of Strathclyde, 75 Montrose St, Glasgow G1 1XQ, UK
3 : IFREMER, Marine and Structures Laboratory, Centre Manche Mer du Nord, 150 Quai Gambetta, 62200 Boulogne-sur-Mer, France
Source Journal Of Marine Science And Engineering (2077-1312) (MDPI AG), 2021-06 , Vol. 9 , N. 6 , P. 593 (25p.)
DOI 10.3390/jmse9060593
Note This article belongs to the Special Issue Marine Renewables–Infrastructures and Physical Testing Externally hosted supplementary file 1 Doi: 10.17035/d.2021.0134828496 Link: http://doi.org/10.17035/d.2021.0134828496 Description: The data and code to reproduce the figures using MATLAB can be found at the following DOI.
Keyword(s) tank testing, load prediction, tidal turbine, wave-current interaction, marine energy

Tidal devices are likely to faced with shear flows and subjected to various wave climates. The paper presents an experimental study of the combined impacts of shear profile and irregular waves on the loading of a 1/20th scale device operating at peak power extraction. The experiments presented were conducted at various depths to facilitate analysis of the effects of the shear flow and wave impact on the device at various positions in the water column. The fluid field was measured at three different upstream positions and at three depths (top, middle and bottom of the rotor) for each experiment; in doing so, data from the device were captured three times. The fluid measurements were of a high quality and were analysed to present the structure flow upstream of the device, which contained velocity and turbulence profiles. The upstream measurement was utilised to understand the development of flow structures in the approach to the device, and the impact of the flow structures measured was confirmed via cross-covariance calculations. The long datasets gathered were used to produce full rotational probability density functions for the blade-root-bending moments for three blades. The spectral characteristics were also considered, and showed that rotor loading quantities are less reactive to smaller scale flow structures.

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Allmark Matthew, Martinez Rodrigo, Ordonez-Sanchez Stephanie, Lloyd Catherine, O’doherty Tim, Germain Gregory, Gaurier Benoit, Johnstone Cameron (2021). A Phenomenological Study of Lab-Scale Tidal Turbine Loading under Combined Irregular Wave and Shear Flow Conditions. Journal Of Marine Science And Engineering, 9(6), 593 (25p.). Publisher's official version : https://doi.org/10.3390/jmse9060593 , Open Access version : https://archimer.ifremer.fr/doc/00696/80849/