The progress in wave energy conversion in Europe during the past ten years is reviewed and current activities and initiatives in the wave energy sector at National and Union level are described. Other important activities worldwide are summarized. The technical and econ

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Wave energy in Europe: current status and perspectives

Oscillating-water-column wave energy converters and air turbines: A review

Current status of self rectifying air turbines for wave energy conversion

A twin unidirectional impulse turbine topology for OWC based wave energy plants

This paper describes the present status of the art on air turbines, which could be used for wave energy conversion. The air turbines included in the paper are as follows: Wells type turbines, impulse turbines, radial turbines, cross-flow turbine, and Savonius turbine. The overall performances of the turbines under irregular wave conditions, which typically occur in the sea, have been compared by numerical simulation and sea trial. As a result, under irregular wave conditions it is found that the running and starting characteristics of the impulse type turbines could be superior to those of the Wells turbine. Moreover, as the current challenge on turbine technology, the authors explain a twin-impulse turbine topology for wave energy conversion.

/pdf/air-turbines-for-wave-energy-conversion-1byeolr017.pdf

Air Turbines for Wave Energy Conversion

Performance of an Impulse Turbine Based Wave Energy Plant

A device and process for measuring tide levels comprising a guide tube having its lower open end immersed below the lowest tide level, a transducer positioned substantially at the upper end of the guide tube for generation and reception of electrical and acoustical signals, a switching circuit for isolating the transmitting and receiving signals, and at least one branch tube provided near the upper portion of the guide tube. The length of the branch tube is determined by a formula that takes into account the wavelength and velocity of the sound signals, and the diameter of the guide tube is determined by a formula that takes into account the wavelength of the sound signals.

Device for measuring liquid level preferably measuring tide level in sea

Backward Bent Duct Buoy (BBDB) was developed by corporation of Japan, India, China. It is characterized by how air chamber duct, which is bent to backward below float, to open to the stern. BBDB has a high conversion efficiency and low mooring force and easy to construct, Power can be generated by BBDB than any kind wave power device including floating type and shore fixed type. Wells turbine test in India experienced very low efficiency by stall characteristic, and so Setoguchi turbine, or impulse turbine with four valves is adopted, it recovers turbine efficiency. Wound type Induction generator with capacitor control (Hellers Generator) is used to connect to Grid Line.

Development of Backward Bent Duct Buoy (BBDB)

The National Institute of Ocean Technology (NIOT), in cooperation with IIT-Madras is actively engaged in research and development of ocean energy resources. As a part of the continuing research on wave energy converters and power systems, NIOT initiated a joint research project on floating Backward Bent Ducted Buoy converters, in collaboration with the Pacific Society, Japan. Using the model test results conducted elsewhere, a smaller model suitable for testing in the wave tank facility at IIT-Madras was designed. A number of parameters such as the pressure developed inside the device, the elevation inside the chamber, the pneumatic power that can be extracted and the average wave to pneumatic power conversion efficiency in real seas have been measured. This paper discusses the performance of a BBDB device under regular and random wave conditions.

A.G. Pathak

Papers

Performance of an Impulse Turbine Based Wave Energy Plant

Device for measuring liquid level preferably measuring tide level in sea

Development of Backward Bent Duct Buoy (BBDB)

Performance Studies On a Scaled Model of Backward Bent Ducted Buoy (BBDB) Type Wave Energy Converter In Regular And Random Waves

The Indian wave energy programme- an overview