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Wave power extraction from multiple oscillating water columns along a straight coast

Published online by Cambridge University Press:  13 September 2019

Siming Zheng*
Affiliation:
School of Engineering, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK
Alessandro Antonini
Affiliation:
Department of Hydraulic Engineering, Delft University of Technology, 2628 CN Delft, The Netherlands
Yongliang Zhang
Affiliation:
State Key Laboratory of Hydroscience and Engineering, Tsinghua University, 100084 Beijing, China
Deborah Greaves
Affiliation:
School of Engineering, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK
Jon Miles
Affiliation:
School of Engineering, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK
Gregorio Iglesias
Affiliation:
School of Engineering, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK Centre for Marine Renewable Energy Ireland (MaREI), Environmental Research Institute and School of Engineering, University College Cork, Cork, P43 C573, Ireland
*
Email address for correspondence: siming.zheng@plymouth.ac.uk

Abstract

The integration of oscillating water column (OWC) wave energy converters into a coastal structure (breakwater, jetty, pier, etc.) or, more generally, their installation along the coast is an effective way to increase the accessibility of wave power exploitation. In this paper, a theoretical model is developed based on the linear potential flow theory and eigenfunction matching method to evaluate the hydrodynamic performance of an array of OWCs installed along a vertical straight coast. The chamber of each OWC consists of a hollow vertical circular cylinder, which is half embedded in the wall. The OWC chambers in the theoretical model may have different sizes, i.e. different values of the radius, wall thickness and submergence. At the top of each chamber, a Wells turbine is installed to extract power. The effects of the Wells turbine together with the air compressibility are taken into account as a linear power take-off system. The hydrodynamic and wave power extraction performance of the multiple coast-integrated OWCs is compared with that of a single offshore/coast-integrated OWC and of multiple offshore OWCs. More specifically, we analyse the role of the incident wave direction, chamber size (i.e. radius, wall thickness and submergence), spacing between OWCs and number of OWCs by means of the present theoretical model. It is shown that wave power extraction from the coast-integrated OWCs for a certain range of wave conditions can be significantly enhanced due to both the constructive array effect and the constructive coast effect.

Type
JFM Papers
Copyright
© 2019 Cambridge University Press 

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