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The effects of blade roughness and fouling on marine current turbine performance
Citation
Walker, JM and Flack, KA and Lust, EE and Schultz, MP and Luznik, L, The effects of blade roughness and fouling on marine current turbine performance, Proceedings of the 10th European Wave and Tidal Energy Conference, 2-5 September 2013, Aalborg, Denmark, pp. 1-10. ISSN 2309-1983 (2013) [Refereed Conference Paper]
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Copyright Statement
Copyright 2013 European Wave and Tidal Energy Conference
Official URL: http://www.ewtec.org/conference/index.php/2011/EWT...
Abstract
The impact of blade roughness and biofouling on the
performance of a two-bladed horizontal axis marine current
turbine was investigated experimentally and numerically. A 0.8
m diameter rotor (1/25th scale) with a NACA 63-618 cross section
was tested in a towing tank. The torque, thrust and rotational
speed were measured in the range 5 < ë < 11 (ë = tip speed ratio).
Three different cases were tested: clean blades, artificially fouled
blades and roughened blades. The performance of the turbine
was predicted using Blade Element Momentum theory and
validated using the experimental results. The lift and drag curves
necessary for the numerical model were obtained by testing a 2D
NACA 63-618 aerofoil in a wind tunnel under clean and
roughened conditions. The numerical model predicts the trends
that were observed in the experimental data for roughened
blades. The artificially fouled blades did not adversely affect
turbine performance, as the vast majority of the fouling sheared
off. The remaining material improved the performance by
delaying stall to higher angles of attack and allowing
measurements at lower ë than were attainable using the clean
blades. The turbine performance was adversely affected in the
case of roughened blades, with the power coefficient (CP) versus ë
curve significantly offset below that for the clean case. The
maximum CP for this condition was 0.34, compared to 0.42 for
the clean condition.
Item Details
Item Type: | Refereed Conference Paper |
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Keywords: | Blade element momentum, biofouling, marine current, roughness, turbine, tidal |
Research Division: | Engineering |
Research Group: | Maritime engineering |
Research Field: | Ocean engineering |
Objective Division: | Energy |
Objective Group: | Renewable energy |
Objective Field: | Tidal energy |
UTAS Author: | Walker, JM (Dr Jessica Walker) |
ID Code: | 86390 |
Year Published: | 2013 |
Deposited By: | NC Maritime Engineering and Hydrodynamics |
Deposited On: | 2013-09-11 |
Last Modified: | 2017-10-04 |
Downloads: | 24 View Download Statistics |
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