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Hydrodynamics and load shedding behavior of a variable-geometry oscillating surge wave energy converter (OSWEC)

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  • Choiniere, Michael
  • Davis, Jacob
  • Nguyen, Nhu
  • Tom, Nathan
  • Fowler, Matthew
  • Thiagarajan, Krish

Abstract

In order to improve their long-term viability, wave energy converters (WECs) need to be able to shed loads when a threshold wave condition is exceeded. As shown by Tom et al. (2016) [1], provision of adjustable flaps within the body of an oscillating surge wave energy converter (OSWEC) allows wave energy to pass through the device. A control system may then be able to open and close the flaps when waves approaching the device exceed preset thresholds. The variable-geometry OSWEC (VG-OSWEC) concept studied in this paper is a bottom-hinged, rectangular wave paddle with five flaps of elliptical cross-section embedded into the face of the paddle. System ID tests were conducted on this VG-OSWEC device at a 1:14 scale in a wave basin. Free decay tests showed that the damping was distinctly nonlinear when the flaps were fully open, and the natural frequency increased by 40% when compared with the flaps in a fully closed configuration.

Suggested Citation

  • Choiniere, Michael & Davis, Jacob & Nguyen, Nhu & Tom, Nathan & Fowler, Matthew & Thiagarajan, Krish, 2022. "Hydrodynamics and load shedding behavior of a variable-geometry oscillating surge wave energy converter (OSWEC)," Renewable Energy, Elsevier, vol. 194(C), pages 875-884.
    • Handle: RePEc:eee:renene:v:194:y:2022:i:c:p:875-884
    DOI: 10.1016/j.renene.2022.05.169
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    References listed on IDEAS

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    1. Tom, N.M. & Lawson, M.J. & Yu, Y.H. & Wright, A.D., 2016. "Development of a nearshore oscillating surge wave energy converter with variable geometry," Renewable Energy, Elsevier, vol. 96(PA), pages 410-424.
    2. Brito, Moisés & Ferreira, Rui M.L. & Teixeira, Luis & Neves, Maria G. & Canelas, Ricardo B., 2020. "Experimental investigation on the power capture of an oscillating wave surge converter in unidirectional waves," Renewable Energy, Elsevier, vol. 151(C), pages 975-992.
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