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A twin unidirectional impulse turbine topology for OWC based wave energy plants

Author

Listed:
  • Jayashankar, V.
  • Anand, S.
  • Geetha, T.
  • Santhakumar, S.
  • Jagadeesh Kumar, V.
  • Ravindran, M.
  • Setoguchi, T.
  • Takao, M.
  • Toyota, K.
  • Nagata, S.

Abstract

Experimental results from near shore bottom standing OWC based wave energy plants in Japan and India have now been available for about a decade. Historically the weakest link in the conversion efficiency of OWC based wave energy plants built so far has been the bidirectional turbine. This is possibly because a single turbine has been required to deliver power when the plant is exposed to random incident wave excitation varying by a factor of 10. A new topology that uses twin unidirectional turbines (which features a high efficiency spanning a broad range) is proposed. Using the Indian Wave Energy plant as a case study, it is shown that the power output from such a module considerably exceeds existing optimal configurations including those based on a fixed guide vane impulse turbine, linked guide vane impulse turbine or a Well's turbine. A wave to wire efficiency of the order of 50% over the incident range is shown to be feasible in a credible manner by showing the output at all stages of the conversion process. A frequency domain technique is used to compute the OWC efficiency and a time domain approach used for the power module with the turbine pressure being the pivotal variable.

Suggested Citation

  • Jayashankar, V. & Anand, S. & Geetha, T. & Santhakumar, S. & Jagadeesh Kumar, V. & Ravindran, M. & Setoguchi, T. & Takao, M. & Toyota, K. & Nagata, S., 2009. "A twin unidirectional impulse turbine topology for OWC based wave energy plants," Renewable Energy, Elsevier, vol. 34(3), pages 692-698.
    • Handle: RePEc:eee:renene:v:34:y:2009:i:3:p:692-698
    DOI: 10.1016/j.renene.2008.05.028
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    References listed on IDEAS

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    1. Thakker, Ajit & Usmani, Zia & Dhanasekaran, T.S, 2004. "Effects of turbine damping on performance of an impulse turbine for wave energy conversion under different sea conditions using numerical simulation techniques," Renewable Energy, Elsevier, vol. 29(14), pages 2133-2151.
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