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Non-dimensional scaling of tidal stream turbines

Mason-Jones, Allan, O'Doherty, Daphne Maria, Morris, Ceri E., O'Doherty, Timothy, Byrne, Carlton Barrie Baylis, Prickett, Paul William, Grosvenor, Roger Ivor, Owen, I., Tedds, S. and Poole, R. J. 2012. Non-dimensional scaling of tidal stream turbines. Energy 44 (1) , pp. 820-829. 10.1016/j.energy.2012.05.010

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Abstract

The impact of local depth-wise velocity profiles on tidal turbine performance is important. Although the use of standard power laws for predicting velocity profiles is common, these laws may underestimate the magnitude of the depth-wise velocity shear and power attenuation. Predicting the performance of a tidal turbine in a high velocity shear is crucial in terms of power extraction. This paper discusses the dimensional scaling of a turbine using CFD and experimental data. Key performance characteristics (power, torque and thrust coefficients) were studies with increasing diameters and velocities, by generating. a series of non-dimensional curves. This provides a first order approximation for matching turbine performance characteristics to site conditions. The paper also shows that the use of a volume-averaged velocity derived from the upstream velocity profile can be used to determine these key performance characteristics. These are within 2% of those determined assuming a uniform flow. The paper also shows that even changes in the blade pitch angle results in new turbine characteristics under uniform velocity conditions and it is expected that these can be used for profiled flow.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
Uncontrolled Keywords: Marine turbines; Scaling; CFD; Torque coefficient; Power coefficient; Thrust coefficient; Velocity profile
Additional Information: Integration and Energy System Engineering, European Symposium on Computer-Aided Process Engineering 2011
Publisher: Elsevier
ISSN: 0360-5442
Last Modified: 04 Jun 2017 04:18
URI: http://orca.cf.ac.uk/id/eprint/36248

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