Quantum mechanics

Voltage

Rotor (electric)

Engineering

Aerospace engineering

Turbine blade

Energy (signal processing)

Duct (anatomy)

Wells turbine

Ram air turbine

Mechanical engineering

Physics

Wave energy converter

Oscillating Water Column

Automotive engineering

Computational fluid dynamics

Turbine

Medicine

Mechanics

Converters

Electrical engineering

Pathology

Renewable Energy

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.

A novel radial self-rectifying air turbine for use in wave energy converters