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Wave energy absorption by a floating air bag

Wave energy absorption by a floating air bag
Wave energy absorption by a floating air bag

A floating air bag, ballasted in water, expands and contracts as it heaves under wave action. Connecting the bag to a secondary volume via a turbine transforms the bag into a device capable of generating useful energy from the waves. Small-scale measurements of the device reveal some interesting properties, which are successfully predicted numerically. Owing to its compressibility, the device can have a heave resonance period longer than that of a rigid device of the same shape and size, without any phase control. Furthermore, varying the amount of air in the bag is found to change its shape and hence its dynamic response, while varying the turbine damping or the air volume ratio changes the dynamic response without changing the shape.

wave-structure interactions, waves/free-surface flows
0022-1120
294-320
Kurniawan, A.
bc6e09a1-7380-470b-a84e-1194ad9fb098
Chaplin, J.R.
d5ed2ba9-df16-4a19-ab9d-32da7883309f
Greaves, D. M.
0ec94618-5a7d-4e26-8f24-500997540d1c
Hann, M.
d9ab234f-5805-4d60-9863-0c3e0b913a75
Kurniawan, A.
bc6e09a1-7380-470b-a84e-1194ad9fb098
Chaplin, J.R.
d5ed2ba9-df16-4a19-ab9d-32da7883309f
Greaves, D. M.
0ec94618-5a7d-4e26-8f24-500997540d1c
Hann, M.
d9ab234f-5805-4d60-9863-0c3e0b913a75

Kurniawan, A., Chaplin, J.R., Greaves, D. M. and Hann, M. (2017) Wave energy absorption by a floating air bag. Journal of Fluid Mechanics, 812, 294-320. (doi:10.1017/jfm.2016.811).

Record type: Article

Abstract

A floating air bag, ballasted in water, expands and contracts as it heaves under wave action. Connecting the bag to a secondary volume via a turbine transforms the bag into a device capable of generating useful energy from the waves. Small-scale measurements of the device reveal some interesting properties, which are successfully predicted numerically. Owing to its compressibility, the device can have a heave resonance period longer than that of a rigid device of the same shape and size, without any phase control. Furthermore, varying the amount of air in the bag is found to change its shape and hence its dynamic response, while varying the turbine damping or the air volume ratio changes the dynamic response without changing the shape.

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Accepted/In Press date: 27 November 2016
e-pub ahead of print date: 28 December 2016
Published date: 10 February 2017
Keywords: wave-structure interactions, waves/free-surface flows
Organisations: Civil Maritime & Env. Eng & Sci Unit

Identifiers

Local EPrints ID: 407417
URI: http://eprints.soton.ac.uk/id/eprint/407417
ISSN: 0022-1120
PURE UUID: 416e94d4-6c34-4579-a1cc-26b8215e8a1d
ORCID for J.R. Chaplin: ORCID iD orcid.org/0000-0003-2814-747X

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Date deposited: 05 Apr 2017 01:12
Last modified: 16 Mar 2024 05:05

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Contributors

Author: A. Kurniawan
Author: J.R. Chaplin ORCID iD
Author: D. M. Greaves
Author: M. Hann

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