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Ocean Space Utilization

A Duct Optimization Study for a Vertical Axis Hydro-current Turbine Model

[+] Author and Article Information
M. Alidadi1

Department of Mechanical Engineering,  University of British Columbia, 6250 Applied Science Lane, Vancouver, British Columbia, Canada, V6T1Z4mahmoud.alidadi@gmail.com

V. Klaptocz

 Mavi Innovation Inc. 401-1868 West 8th Avenue, Vancouver British Columbia, Canada, V6J5G3voytek@mavi-innovations.ca

G. W. Rawlings

 Mavi Innovation Inc. 401-1868 West 8th Avenue, Vancouver British Columbia, Canada, V6J5G3bill@mavi-innovations.ca

Y. Nabavi

 Mavi Innovation Inc. 401-1868 West 8th Avenue, Vancouver British Columbia, Canada, V6J5G3ynabavi@yahoo.com

S. Calisal

Professor Emeritus, Department of Mechanical Engineering,  University of British Columbia, 6250 Applied Science Lane, Vancouver, British Columbia, Canada, V6T1Z4sandermcalisal@gmail.com

1

Address all correspondence to this author.

J. Offshore Mech. Arct. Eng 134(2), 021201 (Dec 02, 2011) (6 pages) doi:10.1115/1.4004955 History: Received November 27, 2009; Revised May 03, 2010; Published December 02, 2011; Online December 02, 2011

A numerical optimization study is used to design a duct for a model of vertical axis hydro-current turbine. The effects of this duct on the power output and torque fluctuations of the turbine model are then examined numerically and experimentally. Relatively good agreement was obtained between the experimental results and numerical predictions especially at higher tip speed ratios. Experimental results show an 85% increase in the maximum power output when the turbine is placed inside the duct. The numerical and experimental torque curves for the turbine also show substantial reductions in the torque fluctuations as a result of ducting.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

Schematic of the duct shape in the optimization study

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Figure 3

Schematic of the modeling for a ducted vertical axis turbine

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Figure 4

NACA 63 (4)-021 characteristics

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Figure 5

Power coefficient curves for the initial and optimized ducts

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Figure 6

Shape of the initial and optimized ducts

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Figure 7

Schematic of the experimental setup

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Figure 8

Experimental Ck values for the arms

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Figure 9

Power coefficients for the free stream turbine at U∞=1.5m/s

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Figure 10

Power coefficients for the free stream turbine at U∞=2.0m/s

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Figure 11

Torque curves for the free stream turbine at Λ=3 and U∞=1.5m/s

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Figure 12

Torque curves for the free stream turbine at Λ=3 and U∞=2.0m/s

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Figure 13

Power coefficients for the ducted turbine at U∞=1.5m/s

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Figure 14

Power coefficients for the ducted turbine at U∞=2.0m/s

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Figure 15

Torque curves for the ducted turbine at Λ=3 and U∞=1.5m/s

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Figure 16

Torque curves for the ducted turbine at Λ=3 and U∞=2.0m/s

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Figure 1

Flow chart of the optimization process

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