Renewable power Research Papers - Academia.edu (original) (raw)
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This paper outlines the procedures and preliminary results for a set of experiments on the Transverse Horizontal Axis Water Turbine (THAWT), which is a variant of a Darrieus turbine. Testing of a 1/20th scale device was conducted in the... more
This paper outlines the procedures and preliminary results for a set of experiments on the Transverse Horizontal Axis Water Turbine (THAWT), which is a variant of a Darrieus turbine. Testing of a 1/20th scale device was conducted in the combined wind, wave and current tank at Newcastle University. Flow depth and velocity were varied over a range of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of the THAWT design. Variants included a parallel bladed device, a “truss” device and a parallel bladed device configured with blades pitched relative to the pitch circle tangent. Experiments were carried out using a speed controlled motor, allowing quasi-steady results to be taken over a range of tip speed ratios. Preliminary results demonstrate that, over a range of flow conditions, the device is capable of exceeding the Lanchester-Betz limit for kinetic efficiency. This is principally due to the relatively high blockage ratio which can be achieved with such a device.
- by Raquel Jorge and +1
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- Mechanical Engineering, Civil Engineering, Energy, Renewable power