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The Oscillating Wave Surge Converter

Experience of QUB in wave power research. 1982

Albert_Lan
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The Oscillating Wave Surge Converter

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    1. The Oscillating Wave Surge Converter Matt Folley Trevor Whittaker Max Osterried

    2. Experience of QUB in wave power research 1982 – wave-powered navigation buoy 1987 – 75 kW shoreline OWC prototype 2001 – LIMPET 500 kW shoreline OWC

    3. The Oscillating Wave Surge Converter concept A working surface moving predominantly horizontally to couple strongly with the water particle motion in shallow water A water column behind the working surface To tune the device to the predominant wave frequency To minimise losses due to reflection

    4. Some possible OWSC conceptual configurations

    5. Comparison of bottom and top hinged OWSC’s Top hinged OWSC Better matching of water particle motion as water depth decreases Accessible bearings / power take-off Paddle can swing through 360° Bottom hinged OWSC Better matching of water particle motion as water depth increases Inaccessible bearings / power take-off “End-stop” problem

    6. OWSC testing programme 1/40th scale model 6 Bretschneider sea-states Energy period, Te = 7, 10 , 13 secs Incident wave power, Pi = 10, 20, 40 kW/m 3 wave probe reflection analysis

    7. OWSC model Proney brake used to simulate constant pressure hydraulics

    8. Optimum damping for the OWSC

    9. Power audit for the OWSC

    10. Maximum capture factors of the OWSC, LIMPET and Pendulor

    11. Embodiment 1 – single shoreline OWSC

    12. Embodiment 2 – single near-shore OWSC

    13. Embodiment 3 – OWSC near-shore terminator array

    14. Improved OWSC control strategies Improve damping characteristics Variable pressure hydraulics Variable displacement pump Improve OWSC phase characteristics Complex conjugate control Latching

    15. Conclusions The OWSC is a promising shoreline / near-shore wave energy converter Logical progression from current technology Further improvements possible Optimisation of configuration - hydrodynamic analysis Optimisation of control - dynamic analysis Optimisation of construction – cost/benefit analysis

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