Wave energy devices with compressible volumes
Wave energy devices with compressible volumes
We present an analysis of wave energy devices with air-filled compressible submerged volumes, where variability of volume is achieved by means of a horizontal surface free to move up and down relative to the body. An analysis of bodies without power take-off (PTO) systems is first presented to demonstrate the positive effects a compressible volume could have on the body response. Subsequently, two compressible device variations are analysed. In the first variation, the compressible volume is connected to a fixed volume via an air turbine for PTO. In the second variation, a water column separates the compressible volume from another volume, which is fitted with an air turbine open to the atmosphere. Both floating and bottom-fixed, axisymmetric, configurations are considered, and linear analysis is employed throughout. Advantages and disadvantages of each device are examined in detail. Some configurations with displaced volumes less than 2000?m3 and with constant turbine coefficients are shown to be capable of achieving 80% of the theoretical maximum absorbed power over a wave period range of about 4?s.
1-23
Kurniawan, Adi
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Greaves, Deborah
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Chaplin, John
d5ed2ba9-df16-4a19-ab9d-32da7883309f
8 December 2014
Kurniawan, Adi
102acfd0-92c9-4e3b-b1ca-35b023d649b7
Greaves, Deborah
c4a6e284-6384-4888-af1e-fd7dec96cb19
Chaplin, John
d5ed2ba9-df16-4a19-ab9d-32da7883309f
Kurniawan, Adi, Greaves, Deborah and Chaplin, John
(2014)
Wave energy devices with compressible volumes.
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 470 (2172), .
(doi:10.1098/rspa.2014.0559).
Abstract
We present an analysis of wave energy devices with air-filled compressible submerged volumes, where variability of volume is achieved by means of a horizontal surface free to move up and down relative to the body. An analysis of bodies without power take-off (PTO) systems is first presented to demonstrate the positive effects a compressible volume could have on the body response. Subsequently, two compressible device variations are analysed. In the first variation, the compressible volume is connected to a fixed volume via an air turbine for PTO. In the second variation, a water column separates the compressible volume from another volume, which is fitted with an air turbine open to the atmosphere. Both floating and bottom-fixed, axisymmetric, configurations are considered, and linear analysis is employed throughout. Advantages and disadvantages of each device are examined in detail. Some configurations with displaced volumes less than 2000?m3 and with constant turbine coefficients are shown to be capable of achieving 80% of the theoretical maximum absorbed power over a wave period range of about 4?s.
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20140559.full.pdf
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More information
Accepted/In Press date: 25 September 2014
e-pub ahead of print date: 15 October 2014
Published date: 8 December 2014
Organisations:
Energy & Climate Change Group
Identifiers
Local EPrints ID: 396452
URI: http://eprints.soton.ac.uk/id/eprint/396452
ISSN: 1364-5021
PURE UUID: f4747696-4e11-4e7d-b428-a3b675fcf2f7
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Date deposited: 06 Jun 2016 15:23
Last modified: 15 Mar 2024 03:04
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Author:
Adi Kurniawan
Author:
Deborah Greaves
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