Structures and Safety Reliability

Numerical Investigation of 2D Optimal Profile of Backward-Bent Duct Type Wave Energy Converter

[+] Author and Article Information
Masami Suzuki

Department of Mechanical Engineering, Graduate School of Engineering, University of Tokyo, Bunkyo-ku, Tokyo, Japan

Toshiari Kuboki

 The Pacific Society, Minato-ku, Tokyo, Japan

Shuichi Nagata, Toshiaki Setoguchi

Institute of Ocean Energy, Saga University, Saga-shi, Saga, Japan

J. Offshore Mech. Arct. Eng 133(4), 041602 (Apr 12, 2011) (8 pages) doi:10.1115/1.4003519 History: Received December 10, 2009; Revised December 09, 2010; Published April 12, 2011; Online April 12, 2011

A floating type backward-bent duct buoy (BBDB) is a wave energy conversion device with an oscillating water column (OWC) at the front side. The device captures the wave energy using the heaving, the pitching, the surging motion of BBDB, and the heaving motion of OWC. Investigations are carried out to find more reasonable devices than the traditional OWC type floating device. An eigenfunction expansion method is introduced for analyzing the BBDB with OWC. It is confirmed that these solutions give good agreement with several experimental results in this paper. It is shown in a design method how to make BBDB match the turbine characteristics. This feature is being able to select the optimum profile of the turbine and the BBDB individually from each characteristic before comprehensive evaluation of the BBDB and the turbine in the design. After grasping the element characteristics, which are appropriate for the wave energy conversion system, the synthetic design method is built. The BBDB size and the turbine diameter are determined by considering the cost corresponding to the smallest size under the same output. In this way, we can obtain the optimal profiles considering the construction cost including the turbines.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Schematic view of BBDB

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Figure 2

Areas analyzed by basic formulas i and ii

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Figure 3

Area analyzed by basic formula iii

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Figure 4

Area analyzed by basic formula iv

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Figure 5

Experimental model and 2D calculation model

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Figure 6

Amplitude of surging, heaving, pitching of BBDB, displacement of OWC, and efficiency of energy absorption

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Figure 7

Profile of Wells turbine with guide vanes: (a) rotor and (b) guide vane

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Figure 8

Irregular wave characteristics of Wells turbine for torque, input power, and efficiency

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Figure 9

Effect of draft, d1, of BBDB for efficiency, load damping, and wavelength

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Figure 10

Effect of draft, d2, of float for efficiency of energy absorption

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Figure 11

Effect of turbine diameter for efficiency of energy absorbed by OWC, rotational speed of turbine, and turbine power



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