Abstract
The paper presents a numerical study on the aerodynamics of a biradial turbine for wave energy conversion. The turbine is symmetrical with respect to a plane perpendicular to its axis of rotation. The two inlet/outlet rotor openings are axially offset from each other facing the radial direction and two rows of radial-flow movable guide-vanes surround the rotor. The existence of a counter-rotating eddy in the relative flow between rotor blades affects both the flow incidence angle at the rotor inlet and the outlet flow angle. A model was used to predict the incidence at the rotor inlet and the slip at the outlet, and the resulting data was employed to redesign the rotor inlet/outlet blade metal angle for the original guide-vane set. Numerical results for the new geometry were compared with data for the original turbine. The rotor and diffuser losses were reduced especially at operating conditions away from the peak efficiency point, resulting in higher average turbine efficiency.
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