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research-article

Inertial Effects on the Performance of a Bottom-Hinged Oscillating Wave Surge Converter

[+] Author and Article Information
Yi-Chih Chow

Department of Systems Engineering and Naval Architecture, National Taiwan Ocean University, Keelung, Taiwan
ycchow@email.ntou.edu.tw

Shiaw-Yih Tzang

Department of Harbor and River Engineering, National Taiwan Ocean University, Keelung, Taiwan
sytzang@ntou.edu.tw

Jiahn-Horng Chen

Department of Systems Engineering and Naval Architecture, National Taiwan Ocean University, Keelung, Taiwan
b0105@mail.ntou.edu.tw

Chen-Chou Lin

Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, Keelung, Taiwan
cclin@ntou.edu.tw

1Corresponding author.

ASME doi:10.1115/1.4041203 History: Received February 13, 2018; Revised August 09, 2018

Abstract

This paper theoretically and experimentally investigates the inertial effects of the flap body on the performance of a bottom-hinged Oscillating Wave Surge Converter (BH-OWSC). A 2D hydrodynamic theory for a BH-OWSC based on the assumption of potential flow is developed to show that one simple but critical parameter, i.e. the square of sum of three mechanical-impedance terms associated with the inertial effects, can precisely characterizes the performance trend of a BH-OWSC. Model testing in a small-scaled wave basin follows to validate the theoretical formulations with a flap body consisting of multiple hollow cylinders into which water can be filled individually to alter the values of flap's inertial parameters. The performance of each inertial specification of the flap model is evaluated based on the measurement of the mean water discharge from the hydraulic pump (or the power take-off). Finally, the 'near resonant condition' have been validated experimentally by altering the inertial parameters of the flap. Thus, the above-mentioned parameter is shown to be capable of characterizing the inertial effects on the performance of a BH-OWSC, and the minimization of it will maximize the power capturing performance of a BH-OWSC. Consequently, the parameter can be used for design guidelines of the flap body in its inertial aspect, such as locating the centre of mass, and determining the geometric dimensions of a flap body.

Copyright (c) 2018 by ASME
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