Power performance of BBDB OWC wave energy converters

Fully nonlinear time-domain simulation of a backward bent duct buoy floating wave energy converter using an acceleration potential method

An improved understanding of the natural resonances of moonpools contained within floating rigid-bodies: Theory and application to oscillating water column devices

Optimal Resistive Control Strategy for a Floating OWC.

/pdf/reference-model-6-rm6-oscillating-wave-energy-converter-54eb9kefl6.pdf

Reference Model 6 (RM6): Oscillating Wave Energy Converter.

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.

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

A floating-type wave power generating system has an Oscillating Water Column (OWC). The device captures the wave energy using the heaving, pitching and surging motion of the device and the heaving motion of the OWC. The investigations are motivated by the experiments and the numerical analyses undertaken to find a possibility different from an OWC-type floating device, e.g. the Mighty Whale of the Japan Marine Science and Technology Center. The 2-dimensional numerical method for analyzing a floating body with an OWC-type wave energy conversion device is introduced where the eigenfunction expansion method is described under the condition that the linear water wave theory is applicable. It is confirmed that these solutions give good agreement with several experimental results in our previous paper. The 2-D optimal profiles are eliminated according to conditions different from high efficiency, i.e. the minimum size per one power unit and so on. The investigations are established by many calculations, and the optimal load damping coefficient is solved. In this way we can obtain the optimal profiles considered for the construction cost.

Toshiari Kuboki

Papers

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

Numerical Analysis On 2-D Optimal Profile of Floating Device With OWC-type Wave Energy Converter