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Wave energy devices with compressible volumes
Adi Kurniawan1, Deborah Greaves1, John Chaplin2
1School of Marine Science and Engineering, Plymouth University , Plymouth PL4 8AA, UK.
Proceedings. Mathematical, Physical, and Engineering Sciences
|December 9, 2014
Summary
This study analyzes wave energy devices using air-filled compressible volumes. Optimized designs can achieve 80% of maximum absorbed power, demonstrating potential for efficient wave energy conversion.
Area of Science:
- Marine Engineering
- Renewable Energy Technologies
- Fluid Dynamics
Background:
- Wave energy converters (WECs) are crucial for renewable energy.
- Controlling device response is key to maximizing energy absorption.
- Compressible air volumes offer a novel approach to WEC design.
Purpose of the Study:
- To analyze WECs with air-filled compressible submerged volumes.
- To evaluate the impact of compressible volumes on device response without power take-off (PTO).
- To assess two PTO system variations for compressible WECs.
Main Methods:
- Linear analysis of axisymmetric floating and bottom-fixed configurations.
- Modeling of WEC bodies with horizontally moving internal surfaces.
- Analysis of two PTO systems: direct turbine connection and water column separation.
Main Results:
- Compressible volumes positively influence body response.
- Configurations with <2000 m³ displaced volume achieved 80% max absorbed power.
- Performance was evaluated over a ~4 s wave period range with constant turbine coefficients.
Conclusions:
- Compressible air volumes are a viable mechanism for enhancing WEC performance.
- Specific configurations show high potential for efficient wave energy capture.
- Further research can optimize designs for various sea conditions.
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