A twin unidirectional impulse turbine topology for OWC based wave energy plants |
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Authors: | V Jayashankar S Anand T Geetha S Santhakumar V Jagadeesh Kumar M Ravindran T Setoguchi M Takao K Toyota S Nagata |
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Affiliation: | 1. Department of Electrical Engineering, IIT Madras, India;2. Department of Aerospace Engineering, IIT Madras, India;3. Advisor RUTAG, IIT Madras, India;4. Department of Mechanical Engineering, Saga University, Japan;5. Department of Mechanical Engineering, Matsue National College, Japan;6. IOES, Saga University, Japan |
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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. |
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