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Hydrodynamic Investigation of WavePower Buoys
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

With the increasing global demand for energy and environmental awareness, the interestin sustainable energy solutions has grown over the last years including wave energy.In this thesis there is a literature study on Wave Energy Converters (WEC) and a theorychapter on the power in ocean waves. The thesis work was done in in collaboration withCorPower Ocean (CPO), an innovative company developing a WEC. Two buoy shapes,both with two dierent weights were investigated and a comparison made on the eectof latching on power absorption. The work can be separated into two main parts, anumerical simulation and experimental tests.A numerical model incorporated with a mathematical description of CPO Power Take-o(PTO) physics was used to simulate and obtain numerical results on the buoy behaviourin select sea states. The benet of latching was obtained by comparing passively heavingbuoys to latch controlled buoys. The simulation model was used for various analysis ofthe system.Experiments were performed at 1:30 scale on the same buoys in a tank facility. Informationabout the hydrodynamics of the buoy, motion and power absorption was obtainedand the eect of latching on the power absorption found.Results on natural period and radiation damping were obtained and a drag coecientwas estimated.The results show that phase control by latching can substantially increase the powerabsorption of a point absorber and broaden the range of waves it can operate in. Agreementwas found in the numerical model and the experiments when investigating thebenet of latching compared to passively heaving.

Place, publisher, year, edition, pages
2013. , 130 p.
TRITA-AVE, ISSN 1651-7660 ; 2013:65
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-159263OAI: diva2:783984
Available from: 2015-01-28 Created: 2015-01-28 Last updated: 2015-01-28Bibliographically approved

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