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Torsional galloping marine current energy extraction

Conference Paper


Abstract


  • This paper investigated the potential of torsional galloping as an ocean renewable energy mechanism to harvest marine current and tidal stream energy. The torsional galloping phenomenon is a fluid-elastic instability. Steady uniform fluid flow past the structure results in oscillatory rotational motion around a central axis. The use of this mechanism to harvest the energy in fluid flows has received very little attention to date. The present investigation examined the performance of flat plate structures only, covering plate aspect ratios ranging from 0.4 to 1.5. Electrical eddy current damping was applied to the system to simulate the power take-off or energy harvesting from the device. A maximum power extraction efficiency of a modest 5.1% was observed at the lowest aspect ratio trialled. The study also provided an improved understanding of how the response amplitude and frequency are affected by the power take-off damping.

Publication Date


  • 2016

Citation


  • Stappenbelt, B., & Johnstone, A. D. (2016). Torsional galloping marine current energy extraction. In Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016.

Scopus Eid


  • 2-s2.0-85084012393

Web Of Science Accession Number


Abstract


  • This paper investigated the potential of torsional galloping as an ocean renewable energy mechanism to harvest marine current and tidal stream energy. The torsional galloping phenomenon is a fluid-elastic instability. Steady uniform fluid flow past the structure results in oscillatory rotational motion around a central axis. The use of this mechanism to harvest the energy in fluid flows has received very little attention to date. The present investigation examined the performance of flat plate structures only, covering plate aspect ratios ranging from 0.4 to 1.5. Electrical eddy current damping was applied to the system to simulate the power take-off or energy harvesting from the device. A maximum power extraction efficiency of a modest 5.1% was observed at the lowest aspect ratio trialled. The study also provided an improved understanding of how the response amplitude and frequency are affected by the power take-off damping.

Publication Date


  • 2016

Citation


  • Stappenbelt, B., & Johnstone, A. D. (2016). Torsional galloping marine current energy extraction. In Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016.

Scopus Eid


  • 2-s2.0-85084012393

Web Of Science Accession Number