A novel radial self-rectifying air turbine for use in wave energy converters |
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| Affiliation: | 1. Shandong Provincial Key Laboratory of Ocean Engineering, Ocean University of China, 266100 Qingdao, China;2. Qingdao Municipal Key Laboratory of Ocean Renewable Energy, Ocean University of China, 266100 Qingdao, China;3. Ocean Plant Research Division, Korea Research Institute of Ship and Ocean Engineering, 305343 Daejeon, Republic of Korea;4. Department of Ocean Engineering, College of Engineering, Ocean University of China, 266100 Qingdao, China;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. Shandong Provincial Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao, 266100, China;2. Department of Ocean Engineering, Ocean University of China, Qingdao, 266100, China;3. Qingdao Municipal Key Laboratory of Ocean Renewable Energy, Ocean University of China, Qingdao, 266100, China;4. Qingdao National Engineering Laboratory for Subsea Equipment Test and Detection Technology, Qingdao, 266100, China;1. LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, Lisboa 1049-001 Portugal;2. Energy and Environmental Division, Tecnalia Research and Innovation, Derio 48160, Spain |
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| Abstract: | The flow through the air turbine of an oscillating water column (OWC) wave energy converter is reciprocating and is random and highly variable. It is not surprising that the time-averaged efficiency of the air turbine is substantially lower than that of a conventional turbine working in nearly steady conditions. A new type of radial-flow self-rectifying turbine (named here biradial turbine) is described in the paper. The two inlet/outlet openings of the rotor are axially offset from each other and face radially the surrounding space. The turbine is symmetrical with respect to a plane perpendicular to its axis of rotation. The rotor blades are surrounded by a pair of radial-flow guide-vane rows. Each guide vane row is connected to the rotor by an axisymmetric duct whose walls are flat discs. A two-dimensional flow method is used first as a preliminary design tool for the turbine geometry. More detailed numerical results are then obtained with the aid of a commercial three-dimensional real-fluid CFD code, which allows a more refined geometry optimization to be carried out, and yields results for flow details through the turbine and for the turbine overall performance under several operating conditions. |
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