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.

References

References
1.
Nabavi
,
Y.
, 2007, “
Numerical Study of the Duct Shape Effects on the Performance of a Ducted Vertical Axis Tidal Turbine
,” Master’s thesis, University of British Columnia, Vancouver.
2.
Rawlings
,
G.W.
, 2008, “
Parametric Characterization of an Experimental Vertical Axis Hydro Turbine
,” Master’s thesis, University of British Columnia, Vancouver.
3.
Alidadi
,
M.
, 2009, “
Duct Optimization for a Ducted Vertical Axis Hydro Current Turbine
,” Ph.D. dissertation, University of British Columbia, Vancouver, British Columbia, Canada.
4.
Gilbert
,
B.L.
, and
Foreman
,
K.M.
, 1983, “
Experiments with a Diffuser-Augmented Model Wind Turbine
,”
J. Energy Resour. Technol., Trans. ASME
,
105
, pp.
46
53
.
5.
Betz
,
A.
, 1920, “
Das Maximum der Theoretisch Möglichen Ausnützung des Windes durch Windmotoren
,”
Zeitscrift für das Gesamte Turbinenwesen
,
26
.
6.
Lawn
,
C.J.
, 2003, “
Optimization of the Power Output from Ducted Turbines
,”
J. Power Energy
,
217
(
1
), pp.
107
118
.
7.
Setoguchi
,
T.
,
Shiomi
,
N.
, and
Kaneko
,
K.
, 2004, “
Development of Two-Way Diffuser for Fluid Energy Conversion System
,”
Renewable Energy
,
29
, pp.
1757
1771
.
8.
Ponta
,
F.
, and
Jacovkis
,
P.
, 2007, “
Marine-Current Power Generation by Diffuser-Augmented Floating Hydro-Turbines
,”
Renewable Energy
,
33
(
4
), pp.
665
673
.
9.
Nocedal
,
J.
, and
Wright
,
S.J.
, 1999,
Numerical Optimization
,
Springer
,
Berlin
.
10.
Strickland
,
J. H.
,
Webster
,
B. T.
, and
Nguyen
,
T.
, 1979, “
A Vortex Model of the Darrieus Turbine: An Analytical and Experimental Study
,”
J. Fluids Eng.
,
101
, pp.
500
505
.
11.
Leishman
,
J.G.
, 2006,
Principles of Helicopter Aerodynamics
,
2nd edition
,
Cambridge University Press
.
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