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The main objective of this paper is to analyse extreme cases of wave-current interactions on tidal stream energy converters. Experiments were undertaken in the INSEAN tow tank facility where carriage speeds of 0.5 and 1m/s were used with and without waves. The waves studied in this testing campaign had wave heights of 0.2 to 0.4m with a 2s wave period in a stationary reference frame. These wave conditions were considered extreme cases considering the use of a turbine with a rotor diameter of 0.5m. The turbine was equipped with a torque transducer, an encoder and a strain gauge to measure both the rotor torque and the forces on a single blade root. The results of the experiments showed that extreme wave-current cases can result in significant variations in power. Investigating the time histories of the blade root loading in wave-current conditions illuminated the importance of the relationships between the wave phase and blade angular position, and the number of blade rotational periods in a wave period. These affected the loading patterns and also the loading range seen by the blade, both of which have important implications for the fatigue life of the blade.
|Number of pages||10|
|Publication status||Accepted/In press - 18 Aug 2016|
|Event||3rd Asian Wave and Tidal Energy Conference - Marina Bay Sands, Singapore, Singapore|
Duration: 24 Oct 2016 → 28 Oct 2016
Conference number: 3
|Conference||3rd Asian Wave and Tidal Energy Conference|
|Abbreviated title||AWTEC 2016|
|Period||24/10/16 → 28/10/16|
- tidal turbine
- extreme environment
- wave current interactions
Ordonez Sanchez, S., Porter, K., Frost, C., Allmark, M., Johnstone, C., & O'Doherty, T. (Accepted/In press). Effects of extreme wave-current interactions on the performance of tidal stream turbines. Paper presented at 3rd Asian Wave and Tidal Energy Conference, Singapore, Singapore.