The effect of the spectral distribution of wave energy on the performance of a bottom hinged flap type wave energy converter

Darragh Clabby, Alan Henry, Matthew Folley, Trevor Whittaker

Research output: Contribution to conferencePaper

13 Citations (Scopus)

Abstract

The power output from a wave energy converter is typically predicted using experimental and/or numerical modelling techniques. In order to yield meaningful results the relevant characteristics of the device, together with those of the wave climate must be modelled with sufficient accuracy.

The wave climate is commonly described using a scatter table of sea states defined according to parameters related to wave height and period. These sea states are traditionally modelled with the spectral distribution of energy defined according to some empirical formulation. Since the response of most wave energy converters vary at different frequencies of excitation, their performance in a particular sea state may be expected to depend on the choice of spectral shape employed rather than simply the spectral parameters. Estimates of energy production may therefore be affected if the spectral distribution of wave energy at the deployment site is not well modelled. Furthermore, validation of the model may be affected by differences between the observed full scale spectral energy distribution and the spectrum used to model it.

This paper investigates the sensitivity of the performance of a bottom hinged flap type wave energy converter to the spectral energy distribution of the incident waves. This is investigated experimentally using a 1:20 scale model of Aquamarine Power’s Oyster wave energy converter, a bottom hinged flap type device situated at the European Marine Energy Centre (EMEC) in approximately 13m water depth. The performance of the model is tested in sea states defined according to the same wave height and period parameters but adhering to different spectral energy distributions.

The results of these tests show that power capture is reduced with increasing spectral bandwidth. This result is explored with consideration of the spectral response of the device in irregular wave conditions. The implications of this result are discussed in the context of validation of the model against particular prototype data sets and estimation of annual energy production.
LanguageEnglish
Publication statusPublished - 2012
EventASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering - Rio de Janeiro, Brazil
Duration: 01 Jul 201206 Jul 2012

Conference

ConferenceASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
CountryBrazil
CityRio de Janeiro
Period01/07/201206/07/2012

Fingerprint

wave energy
sea state
wave climate
energy
wave height
water depth
distribution
effect
modeling
parameter
energy production

Keywords

  • Oyster
  • oscillating wave surge converter
  • Wave Energy Converter
  • Frequency response

Cite this

Clabby, D., Henry, A., Folley, M., & Whittaker, T. (2012). The effect of the spectral distribution of wave energy on the performance of a bottom hinged flap type wave energy converter. Paper presented at ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering, Rio de Janeiro, Brazil.
Clabby, Darragh ; Henry, Alan ; Folley, Matthew ; Whittaker, Trevor. / The effect of the spectral distribution of wave energy on the performance of a bottom hinged flap type wave energy converter. Paper presented at ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering, Rio de Janeiro, Brazil.
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Clabby, D, Henry, A, Folley, M & Whittaker, T 2012, 'The effect of the spectral distribution of wave energy on the performance of a bottom hinged flap type wave energy converter' Paper presented at ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering, Rio de Janeiro, Brazil, 01/07/2012 - 06/07/2012, .

The effect of the spectral distribution of wave energy on the performance of a bottom hinged flap type wave energy converter. / Clabby, Darragh; Henry, Alan; Folley, Matthew; Whittaker, Trevor.

2012. Paper presented at ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering, Rio de Janeiro, Brazil.

Research output: Contribution to conferencePaper

TY - CONF

T1 - The effect of the spectral distribution of wave energy on the performance of a bottom hinged flap type wave energy converter

AU - Clabby, Darragh

AU - Henry, Alan

AU - Folley, Matthew

AU - Whittaker, Trevor

PY - 2012

Y1 - 2012

N2 - The power output from a wave energy converter is typically predicted using experimental and/or numerical modelling techniques. In order to yield meaningful results the relevant characteristics of the device, together with those of the wave climate must be modelled with sufficient accuracy.The wave climate is commonly described using a scatter table of sea states defined according to parameters related to wave height and period. These sea states are traditionally modelled with the spectral distribution of energy defined according to some empirical formulation. Since the response of most wave energy converters vary at different frequencies of excitation, their performance in a particular sea state may be expected to depend on the choice of spectral shape employed rather than simply the spectral parameters. Estimates of energy production may therefore be affected if the spectral distribution of wave energy at the deployment site is not well modelled. Furthermore, validation of the model may be affected by differences between the observed full scale spectral energy distribution and the spectrum used to model it.This paper investigates the sensitivity of the performance of a bottom hinged flap type wave energy converter to the spectral energy distribution of the incident waves. This is investigated experimentally using a 1:20 scale model of Aquamarine Power’s Oyster wave energy converter, a bottom hinged flap type device situated at the European Marine Energy Centre (EMEC) in approximately 13m water depth. The performance of the model is tested in sea states defined according to the same wave height and period parameters but adhering to different spectral energy distributions.The results of these tests show that power capture is reduced with increasing spectral bandwidth. This result is explored with consideration of the spectral response of the device in irregular wave conditions. The implications of this result are discussed in the context of validation of the model against particular prototype data sets and estimation of annual energy production.

AB - The power output from a wave energy converter is typically predicted using experimental and/or numerical modelling techniques. In order to yield meaningful results the relevant characteristics of the device, together with those of the wave climate must be modelled with sufficient accuracy.The wave climate is commonly described using a scatter table of sea states defined according to parameters related to wave height and period. These sea states are traditionally modelled with the spectral distribution of energy defined according to some empirical formulation. Since the response of most wave energy converters vary at different frequencies of excitation, their performance in a particular sea state may be expected to depend on the choice of spectral shape employed rather than simply the spectral parameters. Estimates of energy production may therefore be affected if the spectral distribution of wave energy at the deployment site is not well modelled. Furthermore, validation of the model may be affected by differences between the observed full scale spectral energy distribution and the spectrum used to model it.This paper investigates the sensitivity of the performance of a bottom hinged flap type wave energy converter to the spectral energy distribution of the incident waves. This is investigated experimentally using a 1:20 scale model of Aquamarine Power’s Oyster wave energy converter, a bottom hinged flap type device situated at the European Marine Energy Centre (EMEC) in approximately 13m water depth. The performance of the model is tested in sea states defined according to the same wave height and period parameters but adhering to different spectral energy distributions.The results of these tests show that power capture is reduced with increasing spectral bandwidth. This result is explored with consideration of the spectral response of the device in irregular wave conditions. The implications of this result are discussed in the context of validation of the model against particular prototype data sets and estimation of annual energy production.

KW - Oyster

KW - oscillating wave surge converter

KW - Wave Energy Converter

KW - Frequency response

M3 - Paper

ER -

Clabby D, Henry A, Folley M, Whittaker T. The effect of the spectral distribution of wave energy on the performance of a bottom hinged flap type wave energy converter. 2012. Paper presented at ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering, Rio de Janeiro, Brazil.