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Research Papers: Ocean Renewable Energy

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 20224, Taiwan
e-mail: ycchow@email.ntou.edu.tw

Shiaw-Yih Tzang

Department of Harbor and River Engineering,
National Taiwan Ocean University,
Keelung 20224, Taiwan
e-mail: sytzang@ntou.edu.tw

Jiahn-Horng Chen

Department of Systems Engineering
and Naval Architecture,
National Taiwan Ocean University,
Keelung 20224, Taiwan
e-mail: b0105@mail.ntou.edu.tw

Chen-Chou Lin

Department of Mechanical
and Mechatronic Engineering,
National Taiwan Ocean University,
Keelung 20224, Taiwan
e-mail: cclin@ntou.edu.tw

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received February 13, 2018; final manuscript received August 9, 2018; published online October 12, 2018. Assoc. Editor: Zhen Gao.

J. Offshore Mech. Arct. Eng 141(2), 021902 (Oct 12, 2018) (8 pages) Paper No: OMAE-18-1015; doi: 10.1115/1.4041203 History: Received February 13, 2018; Revised August 09, 2018

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 two-dimensional (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 characterize 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” has been validated experimentally by altering the inertial parameters of the flap. Thus, the aforementioned 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 center of mass and determining the geometric dimensions of a flap body.

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Topics: Waves , Surges , Water
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References

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Figures

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Fig. 1

Schematic of the experimental setup for a BH-OWSC

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Fig. 2

Error associated with the approximation made in Eq. (42), calculated using Eq. (47).

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Fig. 3

W2 and SGopt of a uniform flap (h/d=10) versus hω2/g

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Fig. 4

Schematic views of wave basin

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Fig. 5

Schematic of BH-OWSC model

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Fig. 6

Flap body design: five hollow acrylic tubes stacked up (each tube is designated to a number listed on the right)

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Fig. 7

Variations of F1 and F2 with the mean discharge from the PTO of the BH-OWSC (the case numbers are marked for the data points aligned vertically with them): (a) all 11 cases and (b) close-up for cases 1–5

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Fig. 8

Variations of (W2+F1+F2)2 with the mean discharge from the PTO of the BH-OWSC (the case numbers are marked for the data points aligned vertically with them): (a) all 11 cases and (b) close-up for cases 1–5

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