Wake studies of a 1/30th scale horizontal axis marine current turbine
Wake studies of a 1/30th scale horizontal axis marine current turbine
A 0.4m diameter horizontal axis Marine Current Turbine (MCT) was tested in a circulating water channel. The model turbine was designed to facilitate variable speed operation with full pitching blades and varying rotor yaw. The turbine performance and wake characteristics were determined over a range of flow speeds and rotor thrust coefficients.
Results from the water channel tests indicated that downstream centreline velocity deficits were greater than expected. Blockage type effects (where the velocity was greater than the inflow velocity) occurred around the sides of the rotor disk.
Furthermore, it observed that a Froude scale effect was present that lead to a significant variation in the water surface elevation in the circulating channel. Although this effect was amplified at this model scale, it is expected that reasonable variations in water level could also occur over a full scale MCT array when the devices are in operation.
A momentum-based model was developed that showed good agreement when predicting the model centreline velocity deficits. The model incorporated corrections to account for the changes in the water surface elevation and low velocity deficits that occurred in the circulating channel.
This work will contribute to our understanding of the full-scale operational limits of MCT arrays. It will also give an insight into the optimisation required for implementing this new technology.
008044671X
1205-1210
Myers, L.E.
b0462700-3740-4f03-a336-dc5dd1969228
Bahaj, A.S.
a64074cc-2b6e-43df-adac-a8437e7f1b37
31 July 2005
Myers, L.E.
b0462700-3740-4f03-a336-dc5dd1969228
Bahaj, A.S.
a64074cc-2b6e-43df-adac-a8437e7f1b37
Myers, L.E. and Bahaj, A.S.
(2005)
Wake studies of a 1/30th scale horizontal axis marine current turbine.
Imbabi, M. and Mitchell, P.
(eds.)
In Proceedings of the World Renewable Energy Congress 2005.
Elsevier Science.
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
A 0.4m diameter horizontal axis Marine Current Turbine (MCT) was tested in a circulating water channel. The model turbine was designed to facilitate variable speed operation with full pitching blades and varying rotor yaw. The turbine performance and wake characteristics were determined over a range of flow speeds and rotor thrust coefficients.
Results from the water channel tests indicated that downstream centreline velocity deficits were greater than expected. Blockage type effects (where the velocity was greater than the inflow velocity) occurred around the sides of the rotor disk.
Furthermore, it observed that a Froude scale effect was present that lead to a significant variation in the water surface elevation in the circulating channel. Although this effect was amplified at this model scale, it is expected that reasonable variations in water level could also occur over a full scale MCT array when the devices are in operation.
A momentum-based model was developed that showed good agreement when predicting the model centreline velocity deficits. The model incorporated corrections to account for the changes in the water surface elevation and low velocity deficits that occurred in the circulating channel.
This work will contribute to our understanding of the full-scale operational limits of MCT arrays. It will also give an insight into the optimisation required for implementing this new technology.
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More information
Published date: 31 July 2005
Venue - Dates:
Proceedings World Renewable Energy Congress (WREC 2005), Aberdeen, UK, 2005-05-22 - 2005-05-27
Identifiers
Local EPrints ID: 53728
URI: http://eprints.soton.ac.uk/id/eprint/53728
ISBN: 008044671X
PURE UUID: c8142ba1-2f44-4857-92fa-810d0acb0836
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Date deposited: 28 Jul 2008
Last modified: 23 Jul 2022 01:49
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Contributors
Editor:
M. Imbabi
Editor:
P. Mitchell
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