Oscillating-water-column wave energy converters and air turbines: A review |
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| Affiliation: | 1. Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;2. Hydraulic Engineering Area, Universidade de Santiago de Compostela, Campus Universitario s/n, 27002, Lugo, Spain;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. Department of Civil and Environmental Engineering, University of Maine, Orono, ME 04469, USA;1. LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;2. Energy and Environmental Division, Tecnalia Research and Innovation, Derio 48160, Spain;1. University of Plymouth, School of Marine Science and Engineering, Drake Circus, PL48AA, Plymouth, UK;2. Ecole Centrale de Marseille, 38 Rue Frédéric Joliot Curie, 13013, Marseille, France;3. Ecole nationale supérieure des mines de Nantes, 4 Rue Alfred Kastler, 44300, Nantes, France |
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| Abstract: | The ocean waves are an important renewable energy resource that, if extensively exploited, may contribute significantly to the electrical energy supply of countries with coasts facing the sea. A wide variety of technologies has been proposed, studied, and in some cases tested at full size in real ocean conditions. Oscillating-water-column (OWC) devices, of fixed structure or floating, are an important class of wave energy devices. A large part of wave energy converter prototypes deployed so far into the sea are of OWC type. In an OWC, there is a fixed or floating hollow structure, open to the sea below the water surface, that traps air above the inner free-surface. Wave action alternately compresses and decompresses the trapped air which is forced to flow through a turbine coupled to a generator. The paper presents a comprehensive review of OWC technologies and air turbines. This is followed by a survey of theoretical, numerical and experimental modelling techniques of OWC converters. Reactive phase control and phase control by latching are important issues that are addressed, together with turbine rotational speed control. |
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| Keywords: | Wave energy Oscillating water column Air turbines Modelling Control Review |
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