Several types of oscillating water column (OWC) type wave energy converters (WECs) are researched and developed in the world. They are floating types and fixed types. In case of a fixed type, wave-dissipating caissons could be replaced by WECs of an OWC type. In OWC types, installation of the projecting walls (PWs) is useful in order to improve power take-off (PTO) performance. In this study, a double-dissipating caisson was used as an OWC type WEC with PWs. A front caisson of the double caisson seems to be the area surrounded by PWs and a back caisson can be seen as an OWC. The paper studied the basic property of the primary conversion from wave power to pneumatic power from model tests in a wave tank. It was found that the wave height strongly affects the behaviors of OWC motion and air pressure. Finally, the primary conversion was affected by wave height. Besides, the concept of use of a double caisson was useful for the primary conversion over 80% evaluated using test data.

References

References
1.
Falcao
,
A. F.
, and
Henriques
,
J. C.
,
2016
, “
Oscillating-Water-Column Wave Energy Converters and Air Turbines: A Review
,”
Renew. Energy
,
85
, pp.
1391
1424
.
2.
Osawa
,
H.
,
Washio
,
Y.
,
Miyazaki
,
T.
,
Hotta
,
T.
, and
Miyazaki
,
T.
,
2004
,
R&D of Technologies of Wave Energy Application—Development of Off-Shore Floating Wave Power Device Named Mighty-Whale
,
JAMSTEC
,
Yokosuka, Kanagawa, Japan
.
3.
Toyoda
,
K.
,
Nagata
,
S.
,
Imai
,
Y.
, and
Setoguchi
,
T.
2008
, “
Effects of Hull Shape on Primary Conversion Characteristics of a Floating OWC ‘Backward Bent Duct Buoy’
,”
J. Fluid Sci. Technol.
,
3
, pp.
458
465
.
4.
Ikoma
,
T.
,
Masuda
,
K.
,
Omori
,
H.
,
Osawa
,
H.
, and
Maeda
,
H.
,
2016
, “
Improvement of Performance of Wave Power Conversion Due to the Projecting Walls for Oscillating Water Column Type Wave Energy Converter
,”
ASME J. Offshore Mech. Arct. Eng.
,
138
(
2
), p.
021902
.
5.
Evans
,
D.
,
1976
, “
A Theory for Wave-Power Absorption by Oscillating Bodies
,”
J. Fluid Mech.
,
77
(
1
), pp.
1
25
.
6.
Evans
,
D.
,
1982
, “
Wave-Power Absorption by Systems of Oscillating Surface Pressure Distributions
,”
J. Fluid Mech.
,
114
, pp.
481
499
.
7.
Iturrioz
,
A.
,
Guanche
,
R.
,
Lara
,
J.
,
Vidal
,
C.
, and
Losada
,
I.
,
2015
, “
Validation of OpenFOAM® for Oscillating Water Column Three-Dimensional Modelling
,”
Ocean Eng.
,
107
, pp.
222
236
.
8.
Kuo
,
Y. S.
,
Chung
,
C. Y.
,
Hsiao
,
S. C.
, and
Wang
,
Y. K.
,
2017
, “
Hydrodynamic Characteristics of Oscillating Water Column Caisson Breakwaters
,”
Renew. Energy
,
103
, pp.
439
447
.
9.
Simonetti
,
I.
,
Cappietti
,
L.
,
El
,
S. H.
, and
Oumeraci
,
H.
,
2015
, “
Numerical Modelling of Fixed Oscillating Water Column Wave Energy Conversion Devices: Toward Geometry Hydraulic Optimization
,”
Proceedings of the ASME 34th International Conference on Ocean, Offshore and Arctic Engineering
, St. John’s,
Canada, May 31–June 5
.
10.
Vyzikas
,
T.
,
Deshoulieres
,
S.
,
Giroux
,
O.
,
Barton
,
M.
, and
Greaves
,
D.
,
2017
, “
Numerical Study of Fixed Oscillating Water Column With RANS-Type Two-Phase CFD Model
,”
Renew. Energy
,
102
, pp.
294
305
.
11.
Ikoma
,
T.
,
Masuda
,
K.
,
Eto
,
H.
,
Kihara
,
K.
,
Maeda
,
H.
, and
Takahatake
,
M.
,
2015
, “
Utilization of Wave Dissipating Caissons as an OWC Type Wave Energy Convertor
,”
Proceedings of the ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering
, St. John’s,
Canada, May 31–June 5
.
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