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Determination of damping coefficient experimentally and mathematical vibration modelling of OWC surface fluctuations

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  • Çelik, Anıl
  • Altunkaynak, Abdüsselam

Abstract

Water surface fluctuations inside the chamber of an Oscillating water column (OWC) type wave energy converter (WEC) are very important since they are the conveying processes in conversion of wave energy to electricity. In this study, a mathematical vibration model is developed to estimate the water surface average fluctuations in the chamber and the related phase angles. Resistive forces against the motion of the water column in the chamber are represented by introduced damping coefficient in the equations and determined experimentally by a novel way that is not present in the literature. A particular relative opening height of the chamber is revealed that provides minimum damping which in turn maximizes the highest average chamber water surface fluctuation value regardless of the incident wave parameters. A mathematical vibration model is developed to simulate the water surface fluctuations inside the chamber under different wave conditions and chamber opening heights. Physical experiments were performed to validate the mathematical vibration model results. It is observed that a good agreement exists between the physical experimental data and the mathematical vibration model results.

Suggested Citation

  • Çelik, Anıl & Altunkaynak, Abdüsselam, 2020. "Determination of damping coefficient experimentally and mathematical vibration modelling of OWC surface fluctuations," Renewable Energy, Elsevier, vol. 147(P1), pages 1909-1920.
    • Handle: RePEc:eee:renene:v:147:y:2020:i:p1:p:1909-1920
    DOI: 10.1016/j.renene.2019.09.104
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    References listed on IDEAS

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    1. López, I. & Pereiras, B. & Castro, F. & Iglesias, G., 2014. "Optimisation of turbine-induced damping for an OWC wave energy converter using a RANS–VOF numerical model," Applied Energy, Elsevier, vol. 127(C), pages 105-114.
    2. López, I. & Castro, A. & Iglesias, G., 2015. "Hydrodynamic performance of an oscillating water column wave energy converter by means of particle imaging velocimetry," Energy, Elsevier, vol. 83(C), pages 89-103.
    3. He, Fang & Huang, Zhenhua & Law, Adrian Wing-Keung, 2013. "An experimental study of a floating breakwater with asymmetric pneumatic chambers for wave energy extraction," Applied Energy, Elsevier, vol. 106(C), pages 222-231.
    4. Elhanafi, Ahmed & Fleming, Alan & Macfarlane, Gregor & Leong, Zhi, 2017. "Underwater geometrical impact on the hydrodynamic performance of an offshore oscillating water column–wave energy converter," Renewable Energy, Elsevier, vol. 105(C), pages 209-231.
    5. Ning, De-Zhi & Wang, Rong-Quan & Zou, Qing-Ping & Teng, Bin, 2016. "An experimental investigation of hydrodynamics of a fixed OWC Wave Energy Converter," Applied Energy, Elsevier, vol. 168(C), pages 636-648.
    6. Simonetti, I. & Cappietti, L. & Elsafti, H. & Oumeraci, H., 2017. "Optimization of the geometry and the turbine induced damping for fixed detached and asymmetric OWC devices: A numerical study," Energy, Elsevier, vol. 139(C), pages 1197-1209.
    7. Ning, De-Zhi & Wang, Rong-Quan & Gou, Ying & Zhao, Ming & Teng, Bin, 2016. "Numerical and experimental investigation of wave dynamics on a land-fixed OWC device," Energy, Elsevier, vol. 115(P1), pages 326-337.
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    1. Çelik, Anıl & Altunkaynak, Abdüsselam, 2021. "An in depth experimental investigation into effects of incident wave characteristics front wall opening and PTO damping on the water column displacement and air differential pressure in an OWC chamber," Energy, Elsevier, vol. 230(C).
    2. Ning, De-zhi & Zhou, Yu & Mayon, Robert & Johanning, Lars, 2020. "Experimental investigation on the hydrodynamic performance of a cylindrical dual-chamber Oscillating Water Column device," Applied Energy, Elsevier, vol. 260(C).
    3. Altunkaynak, Abdüsselam & Çelik, Anıl, 2022. "A novel Geno-Nonlinear formula for oscillating water column efficiency estimation," Energy, Elsevier, vol. 241(C).

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