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Cylindrical frontwall entrance geometry optimization of an oscillating water column for utmost hydrodynamic performance

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  • Mandev, Murat Barıs
  • Altunkaynak, Abdüsselam

Abstract

The present research focuses on optimizing the diameter of the cylindrical frontwall entrance shape of an Oscillating Water Column (OWC). In particular, 240 experimental runs are performed for five diameter values, various PTO dampings, dimensionless wave frequencies (Kh) and wave heights. The cylindrical front wall entrance geometry is found to improve the Capture Width Ratio (CWR) of the Oscillating Water Column (OWC) under all conditions. The maximum and average CWR improvement are calculated as 45% and 25%, respectively. The simplicity of the front wall entrance modification makes this achievement even more remarkable. A negative correlation is identified between the diameter size and Kh. In particular, for relatively low, intermediate and large Kh values, optimum diameter sizes are found as 12 cm, 7 cm and 5 cm, respectively. In a specific frequency band, diameter that makes CWR maximum is also found as a function of wave height and orifice ratio. Free decay experimental tests are performed to verify the superiority of the cylindrical geometry. Experimental results indicate that cylindrical frontwall entrance geometry prevents or at least diminishes the flow separation that occurs due to sharp frontwall underlip. Consequently, the reduction in diameter size helps to alleviate the shear stresses on both sides of the front wall, thereby improving the structural integrity of the Oscillating Water Column (OWC) chamber.

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  • Mandev, Murat Barıs & Altunkaynak, Abdüsselam, 2023. "Cylindrical frontwall entrance geometry optimization of an oscillating water column for utmost hydrodynamic performance," Energy, Elsevier, vol. 280(C).
    • Handle: RePEc:eee:energy:v:280:y:2023:i:c:s0360544223015414
    DOI: 10.1016/j.energy.2023.128147
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    References listed on IDEAS

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    4. Mandev, Murat Barış & Altunkaynak, Abdüsselam, 2022. "Advanced efficiency improvement of a sloping wall oscillating water column via a novel streamlined chamber design," Energy, Elsevier, vol. 259(C).
    5. Luo, Yongyao & Nader, Jean-Roch & Cooper, Paul & Zhu, Song-Ping, 2014. "Nonlinear 2D analysis of the efficiency of fixed Oscillating Water Column wave energy converters," Renewable Energy, Elsevier, vol. 64(C), pages 255-265.
    6. Elhanafi, Ahmed & Macfarlane, Gregor & Fleming, Alan & Leong, Zhi, 2017. "Experimental and numerical investigations on the hydrodynamic performance of a floating–moored oscillating water column wave energy converter," Applied Energy, Elsevier, vol. 205(C), pages 369-390.
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    10. 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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    1. Martín-Alcántara, Antonio & Aranda-Hidalgo, José Luis & Jiménez-Solano, Alberto & Sarsa-Rubio, Antonio J., 2023. "Analysis and design of an inverted oscillating water column for energy storage under choked flow conditions," Energy, Elsevier, vol. 285(C).
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    3. Mandev, Murat Barış & Çelik, Anıl & Altunkaynak, Abdüsselam, 2024. "Maximizing oscillating water column efficiency: The impact of vertical plate and guide vane," Energy, Elsevier, vol. 308(C).

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