Hydrodynamic performance of a heaving oscillating water column device restrained by a spring-damper system

Chen Wang, Yongliang Zhang and Zhengzhi Deng

Renewable Energy, 2022, vol. 187, issue C, 331-346

Abstract: The performance of a heaving oscillating water column (OWC) device restrained by a spring-damper system is explored based on linear wave theory. The matching conditions along the common interfaces are employed, and the power take-off model and heaving motion equation are incorporated into the solution procedure. The device, allowed fully-free heaving, restrained by a linear spring and by a spring-damper system, are successively examined under the ideal turbine condition. To achieve practical sense, the performance between different types of devices from a practical turbine strategy is compared as well. The results show that the proper spring value is not only helpful for triggering dual peak efficiencies, but also for expanding the frequency bandwidth relative to the fully-free heaving device. Though the extra inclusion of the damper system can only supplement power extraction, it is beneficial for reducing the horizontal loads on the front lip-wall thus enhance the structure safety. Additionally, under the practical turbine strategy, the heaving device restrained by a spring-damper system is more flexible to be deployed in the maritime spaces dominated by waves with different frequencies relative to the stationary device.

Keywords: Wave power; Heaving OWC; Extraction efficiency; Spring-damper system; Practical turbine strategy (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:187:y:2022:i:c:p:331-346

DOI: 10.1016/j.renene.2022.01.035

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