OPTIMIZATION OF THE WAVECAT WAVE ENERGY CONVERTER

Hernan Fernandez, Gregorio Iglesias, Rodrigo Carballo, Alberte Castro, Marcos Sánchez, Francisco Taveira-Pinto

Abstract


The development of efficient, reliable Wave Energy Converters (WECs) is a prerequisite for wave energy to become a commercially viable energy source. Intensive research is currently under way on a number of WECs, among which WaveCat©—a new WEC recently patented by the University of Santiago de Compostela. In this sense, this paper describes the WaveCat concept and its ongoing development and optimization. WaveCat is a floating WEC intended for operation in intermediate water depths (50–100 m). Like a catamaran, it consists of two hulls—from which it derives its name. The difference with a conventional catamaran is that the hulls are not parallel but convergent; they are joined at the stern, forming a wedge in plan view. Physical model tests of a 1:30 model were conducted in a wave tank using both regular and irregular waves. In addition to the waves and overtopping rates, the model displacements were monitored using a non-intrusive system. The results of the physical model tests will be used to validate the 3D numerical model, which in turn will be used to optimize the design of WaveCat for best performance under a given set of wave conditions.

Keywords


Wave energy; overtopping device; physical modeling; numerical modeling

References


Bedard, R. (2005). Tidal in stream energy conversion (TISEC) devices. EPRI.

Betz, A. (1920). Das maximum der theoretisch möglichen ausnutzung des windes durch windmotoren. Gesamte Turbinenwesen, Heft 26.

Cummins, P. F. (2012). On the extractable power from a tidal channel. Journal of Waterway,Port, Coastal and Ocean Engineering, 138(1), 63-71.http://dx.doi.org/10.1061/(ASCE)WW.1943-5460.0000102

Garrett, C., & Cummins, P. (2005). The power potential of tidal currents in channels. Proceedings of the Royal Society A, (461), 2563-2572.

Garrett, C., & Cummins, P. (2007). The efficiency of a turbine in a tidal channel. J Fluid Mechanics, 588, 243-251.http://dx.doi.org/10.1017/S0022112007007781

Lanchester, F. W. (1915). Acontribution to the theory of propulsion and the screw propeller. Trans. Inst Naval Archit, LVII(98116).

Vennell, R. (2010). Tuning turbines in a tidal channel. Journal of Fluid Mechanics, 663, 253-267.http://dx.doi.org/10.1017/S0022112010003502

Vennell, R. (2011a). Estimating the power potential of tidal currents and the impact of power extraction on flow speeds. Renewable Energy, 36, 3558-3565.http://dx.doi.org/10.1016/j.renene.2011.05.011

Vennell, R. (2011b). Tuning tidal turbines in-concert to maximise farm efficiency. Journal of Fluid Mechanics, 671, 587–604.http://dx.doi.org/10.1017/S0022112010006191

Vennell, R. (2012). The energetics of large tidal turbine arrays. In Press.


Full Text: PDF

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.