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Article

An Experimental Study of a Bottom-Hinged Wave Energy Converter with a Reflection Wall in Regular Waves—Focusing on Behavioral Characteristics

1
Department of Civil and Environmental Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
2
Department of Civil Engineering, Catholic Kwandong University, Gangneung 25601, Korea
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(19), 6734; https://doi.org/10.3390/app10196734
Received: 5 September 2020 / Revised: 22 September 2020 / Accepted: 23 September 2020 / Published: 26 September 2020
(This article belongs to the Special Issue Maritime Hydraulics: Analysis and Modeling)
The hybrid system of wave energy converters (WECs) using coastal structures is an attractive issue in terms of a decrease in construction costs and an improvement of the ability to capture wave energy. Most studies on the utilization of reflected waves from structures, which is one of the hybrid systems, are limited to mathematical analysis based on linear theories. Therefore, this paper presents fundamental experimental results in the presence of a reflection wall simplified as a coastal structure behind a bottom-hinged flap-type WEC under unidirectional regular waves. The behavioral characteristics and the power generation efficiency ke of the flap were investigated, focusing on wave steepness, initial water depth, and distance from the reflection wall. The results show that the condition of the initial water depth being smaller than the flap height is more effective in terms of avoiding unstable rotating of the flap. The maximum ke appeared slightly far from the node position of the standing waves because the flap shape and the power take-off (PTO) damping induce the phase difference between the reciprocating behavior of the flap and the period of the standing wave. The results imply that the optimum position of a WEC is dependent on WEC shape, PTO damping, and installation water depth. View Full-Text
Keywords: wave energy converter; power generation efficiency; bottom-hinged flap-type WEC; standing wave; reflection wall wave energy converter; power generation efficiency; bottom-hinged flap-type WEC; standing wave; reflection wall
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MDPI and ACS Style

Cho, Y.-H.; Nakamura, T.; Mizutani, N.; Lee, K.-H. An Experimental Study of a Bottom-Hinged Wave Energy Converter with a Reflection Wall in Regular Waves—Focusing on Behavioral Characteristics. Appl. Sci. 2020, 10, 6734. https://doi.org/10.3390/app10196734

AMA Style

Cho Y-H, Nakamura T, Mizutani N, Lee K-H. An Experimental Study of a Bottom-Hinged Wave Energy Converter with a Reflection Wall in Regular Waves—Focusing on Behavioral Characteristics. Applied Sciences. 2020; 10(19):6734. https://doi.org/10.3390/app10196734

Chicago/Turabian Style

Cho, Yong-Hwan, Tomoaki Nakamura, Norimi Mizutani, and Kwang-Ho Lee. 2020. "An Experimental Study of a Bottom-Hinged Wave Energy Converter with a Reflection Wall in Regular Waves—Focusing on Behavioral Characteristics" Applied Sciences 10, no. 19: 6734. https://doi.org/10.3390/app10196734

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