A Numerical Study on Multi-Chamber Oscillating Water Columns

Koirala, Pallav; Nagata, Shinji; Imai, Yasutaka; Murakami, Tengen; Setoguchi, Toshiaki

doi:10.2208/journalofjsce.3.1_93

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…The electric resistor is 3,040  constant. The basis thickness of the curtain wall is tc = 0.005 m and the curtain wall depth is 0.1 m. The length L of air chamber is 0.7 m. The outline design of air chamber was carried out in the simulations [13].…”

Section: Methodsmentioning

confidence: 99%

Effects of air chamber and curtain wall geometries on energy conversion performance in a fixed oscillating water column-type wave energy converter

Murakami

Imai

Nagata

et al. 2022

J. Phys.: Conf. Ser.

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An oscillating water column-type wave energy extractor is composed of an air chamber, an air turbine and a generator. The energy conversion process is compounded of the primary conversion in an air chamber and the secondary conversion of an air turbine. The oscillating water column-type wave energy extractor is considered to be safe even under dirty weather conditions. For societal implementation, there is a need to make a design method which can consider the water surface motion, the pressure fluctuation in an air chamber, the rotations of an air turbine and a generator. At here, the authors carried out the 2-dimensional wave tank tests using the model oscillating water column equipped with the impulse turbine and a generator to obtain the experimental data needed to make this design method. In the experiments, the effects of the air chamber and curtain wall geometries on energy conversion performance in regular wave conditions were investigated. As the results, it is noticed that the geometry of the curtain wall and the vortex shedding from the corners of curtain wall affect the primary conversion efficiency.

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Section: Methodsmentioning

confidence: 99%

Effects of air chamber and curtain wall geometries on energy conversion performance in a fixed oscillating water column-type wave energy converter

Murakami

Imai

Nagata

et al. 2022

J. Phys.: Conf. Ser.

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“…The torque transducer (SS-005) and the electromagnetic rotation detector (MP-981) produced by ONO SOKKI Co. Ltd. (Yokohama, Japan) were located at the end of the turbine shaft. The basic chamber length is 0.7 m, the curtain wall depth is 0.1 m and the thickness of the curtain wall is 0.005 m. The schematic design of the air chamber was conducted in a series of numerical studies [20]. Figure 3 indicates the locations of the pressure gauge (AP-10S) and the wave height gauges (FW-H07 and UD320) made by the KEYENCE CORPORATION (Osaka, Japan) at the top of the air chamber.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Experimental Research on Primary and Secondary Conversion Efficiencies in an Oscillating Water Column-Type Wave Energy Converter

et al. 2016

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Abstract:For the practical application of a fixed oscillating water column (OWC)-type wave energy converter, it is necessary to develop a design method which can consider the characteristics of incident wave motion, the motion of the internal free surface affected in the structure such as a partly submerged wall, the fluctuation of air pressure in an air chamber, and the rotation of the air turbine. On the other hand, the impulse turbine as the secondary conversion device in the OWC unit is expected to achieve high efficiency. In this paper, firstly, the steady air flow tests for a single-impulse turbine were conducted to grasp the characteristics of the turbine without the effect of water waves. Secondly, the 2-dimensional wave tank tests in regular waves for the performance evaluation of the fixed OWC-type wave energy converter with the same impulse turbine were conducted to obtain the data needed to make this design method. As the results, the effects of the air chamber length and the guide vane's setting angle on the primary and secondary conversion efficiencies are clarified experimentally.

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“…The torque transducer (SS-005) and the electromagnetic rotation detector (MP-981) produced by ONO SOKKI Co., Ltd. were located at the end of the turbine shaft. The air chamber length is 0.7 m, the curtain wall depth is 0.1 m and the thickness of the curtain wall is 0.005 m. The schematic design of the air chamber was conducted in a series of numerical studies [14]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Performances of Air Turbines for a Fixed Oscillating Water Column-Type Wave Energy Converter

Murakami¹,

Imai²,

Nagata³

et al. 2017

IJAERS

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A Numerical Study on Multi-Chamber Oscillating Water Columns

Cited by 5 publications

References 5 publications

Effects of air chamber and curtain wall geometries on energy conversion performance in a fixed oscillating water column-type wave energy converter

Effects of air chamber and curtain wall geometries on energy conversion performance in a fixed oscillating water column-type wave energy converter

Experimental Research on Primary and Secondary Conversion Efficiencies in an Oscillating Water Column-Type Wave Energy Converter

Experimental Research on Performances of Air Turbines for a Fixed Oscillating Water Column-Type Wave Energy Converter

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