Tidal energy has the advantages of high predictability, high energy density, and limited environmental impacts. As tidal turbines are expected to be used in the most energetic waters where there might be significant waves, the assessment of unsteady hydrodynamic load due to surface waves is of great concern. The objective of this paper is to assess the effects of surface waves and submergence of the turbine on the power performance and loads of a tidal turbine by experimental approach. The experiments on a 1 : 25th model tidal turbine were carried out in a towing tank. A wide range of regular waves with periods from 1.0 s to 3.0 s at model scale were generated. Different submergence conditions were considered to investigate the effects of the presence of free surface. The cases with blade tip partly going out of water were also performed. The regular waves did not have significant influences on average loads and power output in the present experiments, but caused large amplitude of the cyclic variation of the loads. The amplitudes of the cyclic load were proved to be proportional to the incident wave height, and to be sensitive to the wave frequency and submergence of the rotor. As the tidal turbine getting close to free surface, significant waves were induced by the underwater rotating blade. The effects of surface waves and submergence need to be taken into account in design.
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ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
June 25–30, 2017
Trondheim, Norway
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-5774-8
PROCEEDINGS PAPER
The Effects of Surface Waves and Submergence on the Performance and Loading of a Tidal Turbine
Xiaoxian Guo,
Xiaoxian Guo
Shanghai Jiao Tong University, Shanghai, China
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Zhen Gao,
Zhen Gao
Norwegian University of Science and Technology, Trondheim, Norway
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Jianmin Yang,
Jianmin Yang
Shanghai Jiao Tong University, Shanghai, China
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Torgeir Moan,
Torgeir Moan
Norwegian University of Science and Technology, Trondheim, Norway
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Haining Lu,
Haining Lu
Shanghai Jiao Tong University, Shanghai, China
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Xin Li,
Xin Li
Shanghai Jiao Tong University, Shanghai, China
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Wenyue Lu
Wenyue Lu
Shanghai Jiao Tong University, Shanghai, China
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Xiaoxian Guo
Shanghai Jiao Tong University, Shanghai, China
Zhen Gao
Norwegian University of Science and Technology, Trondheim, Norway
Jianmin Yang
Shanghai Jiao Tong University, Shanghai, China
Torgeir Moan
Norwegian University of Science and Technology, Trondheim, Norway
Haining Lu
Shanghai Jiao Tong University, Shanghai, China
Xin Li
Shanghai Jiao Tong University, Shanghai, China
Wenyue Lu
Shanghai Jiao Tong University, Shanghai, China
Paper No:
OMAE2017-62233, V07BT06A055; 10 pages
Published Online:
September 25, 2017
Citation
Guo, X, Gao, Z, Yang, J, Moan, T, Lu, H, Li, X, & Lu, W. "The Effects of Surface Waves and Submergence on the Performance and Loading of a Tidal Turbine." Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. Volume 7B: Ocean Engineering. Trondheim, Norway. June 25–30, 2017. V07BT06A055. ASME. https://doi.org/10.1115/OMAE2017-62233
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