Power estimates of an undulating membrane tidal energy converter

Type Article
Date 2018-01
Language English
Author(s) Trasch Martin1, 2, 3, Deporte Astrid1, Delacroix Sylvain1, Drevet Jean-Baptiste1, Gaurier BenoitORCID2, Germain GregoryORCID2
Affiliation(s) 1 : Eel Energy, 133 Bis Rue Univ, F-75007 Paris, France.
2 : IFREMER, Marine Struct Lab, 150 Quai Gambetta, F-62200 Boulogne, France.
3 : Ademe, 20 Ave Gresille, F-49004 Angers, France.
Source Ocean Engineering (0029-8018) (Pergamon-elsevier Science Ltd), 2018-01 , Vol. 148 , P. 115-124
DOI 10.1016/j.oceaneng.2017.11.002
WOS© Times Cited 6
Keyword(s) Marine renewable energy, Tidal energy converter, Power take-off, Fluid-structure interaction, Flume tank

An experimental study of an undulating membrane based on the Eel Energy device is presented in this paper. This system uses interaction between a semi-rigid plate and an axial flow to generate undulation. At full scale, the deformation of the structure is then converted into electrical power using linear electromagnetic generators. In order to simulate the power take-off on a 1/20th scale prototype, hydraulic dampers are located all over the length of the device. The dampers have non-linear behaviour. A representative damping parameter have been introduced to study their impact.

Results are presented in function of fluid velocity and damping adjustment. Undulation mode, frequency and forces on the structure are described. Results show that fluid velocity has a destabilizing effect on the membrane, increasing undulation frequency and lowering its amplitude, while damping has the opposite effect. Furthermore, two methods used to evaluate the power conversion are described and evaluated from trajectory and forces data analysis. Power estimation shows an evolution proportional to cubic current speed at low flow speed, as for classical tidal turbines. Power also seems to scale with the square of the product between undulation frequency and amplitude.

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