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Hydrodynamic Performance Characteristics of U-OWC Devices

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Ocean Wave Energy Systems

Part of the book series: Ocean Engineering & Oceanography ((OEO,volume 14))

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Abstract

OWC is reported to perform well when exposed to low frequency waves in narrow frequency band. On several occasions, the trough of the potential long wave might reach below the front lip wall of OWC, inducting air into the air chamber. To solve this problem, Boccotti (Boccotti, P. Ocean Engineering 34(5–6), 806–819 (2007a)) modified the conventional OWC concept by incorporating a duct in front of the opening with an intention was to capture the maximum magnitude of dynamic pressure available for oscillation inside the air chamber. This is widely referred to as U-OWC. The performance of U-OWC is explored in a laboratory wave flume. A Froude model scale of 1:20 was adopted to carry out a comprehensive experimental study to investigate the effect of water plane area on pneumatic damping with two aspect ratios (W/B, ratio of chamber width parallel to the wave crest to the width of the chamber in the wave direction) of 0.50 and 1.67 in the model geometry. To investigate the effect of dynamic pressure intensity variation with depth, three h/di of 0.15, 0.30, and 0.45 were considered in the study, where di is the water depth in the chamber. At each of the h/di, the effect of relative bottom opening (O/di) for better phase control and energy conversion was studied. The maximum  impact of pressure excitation had occurred at h/di of 0.30 and b/B of 0.50. The performance of the U-OWC is found to be better over a relatively wider frequency bandwidth near the natural frequency of the system.

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Authors and Affiliations

  1. Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai, India

    V. Sundar & S. A. Sannasiraj

Authors
  1. V. Sundar
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  2. S. A. Sannasiraj
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Corresponding author

Correspondence to V. Sundar .

Editor information

Editors and Affiliations

  1. Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India

    Abdus Samad

  2. Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India

    S.A Sannasiraj

  3. Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India

    V Sundar

  4. Institute of Ocean Energy, Saga University, Saga, Japan

    Paresh Halder

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Sundar, V., Sannasiraj, S.A. (2022). Hydrodynamic Performance Characteristics of U-OWC Devices. In: Samad, A., Sannasiraj, S., Sundar, V., Halder, P. (eds) Ocean Wave Energy Systems. Ocean Engineering & Oceanography, vol 14. Springer, Cham. https://doi.org/10.1007/978-3-030-78716-5_7

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  • DOI: https://doi.org/10.1007/978-3-030-78716-5_7

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-78715-8

  • Online ISBN: 978-3-030-78716-5

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