Three-dimensional hydrodynamic losses are assessed in this investigation for a foil oscillating sinusoidally in a combined heave and pitch motion with large amplitudes. Simulations are performed using a unsteady Reynolds-Averaged-Navier-Stokes (URANS) solver on an oscillating foil in a power-extraction mode; thus acting as a hydrokinetic turbine at high Reynolds number. Foils of various aspect ratios (span to chord length ratio) are considered, both with and without endplates for one representative operation point. Hydrodynamic forces and extracted power are compared with results from the equivalent two-dimensional (2D) computations. It is found that the relative drop of performance (cycle-averaged power extracted) due to 3D hydrodynamic losses can be limited to 10% of the 2D prediction when endplates are used on a foil of aspect ratio greater than ten. The practical consideration of an oscillating-foil hydrokinetic turbine operating in an imperfectly-aligned upstream water flow is also addressed with simulations considering an upstream flow at a yaw angle up to 30° with respect to the foil chord line. Effects on performance are found to be proportional to the projected kinetic energy flux.

References

References
1.
Platzer
,
M. F.
,
Jones
,
K. D.
,
Young
,
J.
, and
Lai
,
J. C.
, 2008, “
Flapping Wing Aerodynamics: Progress and Challenges
,”
AIAA J.
,
46
(
9
), pp.
2136
2149
.
2.
Rozhdestvensky
,
K. V.
, and
Ryzhov
,
V. A.
, 2003, “
Aerohydrodynamics of Flapping-Wing Propulsors
,”
Prog. Aerosp. Sci.
,
39
(
8
), pp.
585
633
.
3.
Kinsey
,
T.
,
Dumas
,
G.
,
Lalande
,
G.
,
Ruel
,
J.
,
Mehut
,
A.
,
Viarouge
,
P.
,
Lemay
,
J.
, and
Jean
,
Y.
, 2011, “
Prototype Testing of a Hydrokinetic Turbine Based on Oscillating Hydrofoils
,”
Renewable Energy
,
36
(
6
), pp.
1710
1718
.
4.
McKinney
,
W.
, and
DeLaurier
,
J.
, 1981, “
Wingmill: An Oscillating-Wing Windmill
,”
J. Energy
,
5
(
2
), pp.
109
115
.
5.
Jones
,
K.
,
Lindsey
,
K.
, and
Platzer
,
M.
, 2003, “
An Investigation of the Fluid-Structure Interaction in an Oscillating-Wing Micro-Hydropower Generator
,”
Fluid Structure Interaction II
,
S. K.
Chakrabarti
,
C. A.
Brebbia
,
D.
Almorza
, and
R.
Gonzalez-Palma
, eds.,
WIT
,
Southampton, UK
, pp.
73
82
.
6.
Peng
,
Z.
, and
Zhu
,
Q.
, 2009, “
Energy Harvesting Through Flow-Induced Oscillations of a Foil
,”
Phys. Fluids
,
21
, p.
123602
.
7.
Zhu
,
Q.
, and
Peng
,
Z.
, 2009, “
Mode Coupling and Flow Energy Harvesting by a Flapping Foil
,”
Phys. Fluids
,
21
, p.
033601
.
8.
Zhu
,
Q.
, 2011, “
Optimal Frequency for Flow Energy Harvesting of a Flapping Foil
,”
J. Fluid Mech.
,
675
, pp.
495
517
.
9.
Shimizu
,
E.
,
Isogai
,
K.
, and
Obayashi
,
S.
, 2008, “
Multiobjective Design Study of a Flapping Wing Power Generator
,”
ASME Trans. J. Fluids Eng.
,
130
, p.
021104
.
10.
Simpson
,
B.
, 2009, “
Experimental Studies of Flapping Foils for Energy Extraction
,” M.S. thesis, MIT, Cambridge, MA.
11.
Semler
,
C.
, 2010, “
Experimental Investigation of an Oscillating Flow Generator
,” M.S. thesis, Naval Postgraduate School, Monterey, CA.
12.
Platzer
,
M.
,
Ashraf
,
M.
,
Young
,
J.
, and
Lai
,
J.
, 2009, “
Development of a New Oscillating-Wing Wind and Hydropower Generator
,”
Proceedings of the 47th AIAA Aerospace Sciences Meeting
, Paper No. AIAA-2009–1211.
13.
Ashraf
,
M.
,
Young
,
J.
,
Lai
,
J.
, and
Platzer
,
M.
, 2011, “
Numerical Analysis of an Oscillating-Wing Wind and Hydropower Generator
,”
AIAA J.
,
49
(
7
), pp.
1374
1386
.
14.
The Engineering Business Limited
, 2002, “
Research and Development of a 150 kw Tidal Stream Generator
,” Technical Report No. 02/1400.
15.
The Engineering Business Limited
, 2003, “
Stingray Tidal Energy Device – Phase 2
,” Technical Report No. 03/1433.
16.
The Engineering Business Limited
, 2005, “
Stingray Tidal Energy Device – Phase 3
,” Technical Report No. 05/864.
18.
Kinsey
,
T.
, and
Dumas
,
G.
, 2008, “
Parametric Study of an Oscillating Airfoil in a Power-Extraction Regime
,”
AIAA J.
,
46
(
6
), pp.
1318
1330
.
19.
Kinsey
,
T.
,
Dumas
,
G.
, and
Olivier
,
M.
, 2007, “
Heaving Amplitude Effects on Oscillating Wing Turbines
,”
Proceedings of the 15th Annual Conference of the CFD Society of Canada
, Paper No. CFD-2007–1068.
20.
Julien
,
S.
,
Dumas
,
G.
, and
Métivier
,
V.
, 2007, “
URANS Simulations of High Amplitude Flapping Airfoils
,”
Proceedings of the 15th Annual Conference of the CFD Society of Canada
, Paper No. CFD-2007–1117.
21.
Kinsey
,
T.
, 2011, “
Analysis, Optimization and Demonstration of a New Concept of Hydrokinetic Turbine Based on Oscillating Hydrofoils
,” Ph.D. thesis, Laval University, Quebec City, Canada.
22.
Lefrançois
,
J.
, 2008, “
Optimisation du Rendement d’une Turbine Multi-ailes à l’aide d’une Méthode Lagrangienne par Particules Vortex
,” M.S. thesis, Laval University, Quebec City, Canada.
23.
Kinsey
,
T.
, and
Dumas
,
G.
, 2012, “
Computational Fluid Dynamics Analysis of a Hydrokinetic Turbine Based on Oscillating Hydrofoils
,”
ASME. J. Fluids Eng.
,
134
(
2
), p.
021104
.
24.
Kinsey
,
T.
, and
Dumas
,
G.
, 2012, “
Optimal Tandem Configuration for Oscillating-Foils Hydrokinetic Turbine
,”
ASME. J. Fluids Eng.
,
134
(
3
), p.
031103
.
26.
ANSYS INC., 2009, ANSYS FLUENT 12.0 User’s Guide, http://www.fluent.comhttp://www.fluent.com
27.
Dacles-Mariani
,
J.
,
Zilliac
,
G.
,
Chow
,
J.
, and
Bradshaw
,
P.
, 1995, “
Numerical/Experimental Study of a Wingtip Vortex in the Near Field
,”
AIAA J.
,
33
(
9
), pp.
1561
1568
.
28.
Stinnes
,
W. H.
, and
von Backstrom
,
T. W.
, 2002, “
Effect of Cross-Flow on the Performance of Air-Cooled Heat Exchanger Fans
,”
Appl. Therm. Eng.
,
22
, pp.
1403
1415
.
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