Wave-power absorption by an oscillating water column in a reflecting wall

Malmo, O.; Reitan, Arne

doi:10.1016/s0141-1187(86)80030-x

Cited by 17 publications

(2 citation statements)

References 2 publications

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“…Count and Evans (1984) numerically studied the effect of projecting wall on device performance using boundary integral method. Malmo and Reitan (1986) numerically studied the wave power absorption by an OWC with a reflecting wall and established that the performance is dependent on geometry of the device, wave frequency and the direction of the wave. McIver and Evans (1988) developed a theory for the performance of wave energy devices within harbours set into a reflecting wall.…”

Section: Introductionmentioning

confidence: 99%

Wave Interaction with a Double Chamber Oscillating Water Column Device

Wilbert

Sundar

Sannasiraj

2013

The International Journal of Ocean and Climate Systems

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The principle of oscillating water column within a chamber due to the propagating oscillatory ocean waves being converted into clean energy through wave energy convertor referred to as Oscillating water column (OWC) device is a well proven concept that still remains as one of the most promising alternate sources of energy from the Ocean. The OWC has single column of water oscillation, whereas, Double Chamber Oscillating Water Column (DCOWC) has two chambers of water oscillation. DCOWC is relatively a new concept. In this paper, the performance characteristics of a DCOWC is evaluated through a well-controlled experimental investigation in a wave flume. The conceptual design aspect of DCOWC and its uniqueness compared with the present state of art in wave energy converters (WECs) are explained. The efficiency of the system is assessed by considering the variations in the geometrical dimensions of the system along with the different characteristics of incident waves. The methodology adopted for evaluating the hydrodynamic performance in terms of energy conversion efficiency, the development of additional structural stability and the wave amplification at the mouth are discussed and its significances are highlighted by presenting the results in a dimensionless form. The analysis of the results indicates the feasibility of the DCOWC concept in harnessing energy from the waves.International Journal of Ocean and Climate Systems (DCOWC) device. A detailed literature review has revealed that a number of researchers have carried out studies on the performance characteristics of OWC, while, the literature on DCOWC is rather limited. This prompted to carry out well controlled physical model tests on the hydrodynamic performance characteristics of DCOWC exposed to the action of regular waves in the present study. EXPERIMENTAL SET-UPThe experiments were carried out in the wave flume of 72.5m long, 2m wide and 2.7m deep at the Department of Ocean Engineering, IIT Madras, India. Three smaller units of DCOWC each of 0.30m x 0.60m x 1.45m and one bigger unit, 1.0m x 0.60m x 1.45m were fabricated for simultaneous testing since the number of parameters dictating the model and the measuring parameters were more. In order to test the above stated four models simultaneously without the interference effect between the adjacent units, plywood partitioning was provided for a length of 11m in between the units. The plan and cross section of the DCOWC model adopted for the present study are shown in Fig. 1. The model parameters of interest are the bottom opening depth (O) of the oscillation chamber and the mouth clearance (h) at the entrance. The width of the front duct (b) was kept at 0.30m. The water depth (d) was maintained at 1m throughout the study. Herein, the depth of water inside the DCOWC model, d i is same as d. To simulate the damping being exerted by the turbine in prototype structure, a circular air hole having a cross sectional area equal to 0.65% of plan area of the air chamber is provided. Wang et al. (2002) have reported OW...

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Section: Introductionmentioning

confidence: 99%

Wave Interaction with a Double Chamber Oscillating Water Column Device

Wilbert

Sundar

Sannasiraj

2013

The International Journal of Ocean and Climate Systems

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“…It has been explored for nearly 200 years [1][2][3][4]. For wave energy utilization, the basic principle is to use the wave energy converters (WECs) of various mechanisms to extract the mechanical energy of the wave including the potential energy and the kinetic energy to generate electricity [5][6][7]. At present, varieties of wave energy conversion devices have been developed all over the world, whose principle and structure are simple and convenient for large-scale production, and the energy conversion efficiency of wave energy generation devices is higher than that of other renewable energy sources.…”

Section: Introductionmentioning

confidence: 99%

Flume Experiments on Energy Conversion Behavior for Oscillating Buoy Devices Interacting with Different Wave Types

Qin

Fan

Zhang

et al. 2021

JMSE

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Oscillating buoy device, also known as point absorber, is an important wave energy converter (WEC) for wave energy development and utilization. The previous work primarily focused on the optimization of mechanical design, buoy’s array configuration and the site selection with larger wave energy density in order to improve the wave energy generation performance. In this work, enlightened by the potential availability of Bragg reflection induced by multiple submerged breakwaters in nearshore areas, we investigate the energy conversion behavior of oscillating buoy devices under different wave types (traveling waves, partial and fully standing waves) by flume experiments. The localized partial standing wave field is generated by the Bragg resonance at the incident side of rippled bottoms. Furthermore, the fully standing wave field is generated by the wave reflection of vertical baffle installed in flume. Then the wave power generation performance is discussed under the conditions with the same wave height but different wave types. The experimental measurements show that the energy conversion performance of the oscillating buoy WEC could be improved under the condition of standing waves when compared with traveling waves. This work provides the experimental comparison evidence of wave energy conversion response of oscillating buoy devices between travelling waves and standing (fully or partial) wave conditions.

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