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Tank experiments for oscillating water column plants

Following several years of research and development on wave energy a project to build a oscillating water column (OWC) wave power plant was started in the Islands of Azores.
The first step in the project was to choose the site location. After some preliminary work, Porto Cachorro in the Island of Pico, was chosen due to a combination of favourable coastline morphology, good exposure to the most energetic wave direction and electric energy demand.

Tank testing of a 1/35 scale model of a shoreline OWC power plant has been undertaken using both in site and JONSWAP spectra.
Difficulties in the reproduction of spectra namely the shift of peak frequency and the presence of secondary peaks have been detected.
Despite these difficulties it was possible to optimize the chamber geometry using 17 different JONSWAP spectra, leading to a full scale result for root mean square absorbed power of 360 kW for a chamber with 129 m{2} area.

Reported by

Instituto Nacional de Engenharia e Tecnologia Industrial
Estrado do Paco do Lumiar
1699 Lisboa
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