OWC wave energy devices with air flow control

Current status of self rectifying air turbines for wave energy conversion

A review of impulse turbines for wave energy conversion

Ocean waves are a promising source of renewable energy In this paper, we briefly introduce the characteristics of ocean wave energy and summarize the principles of harvesting ocean energy by wave 

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Review of control strategies for wave energy conversion systems and their validation: the wave-to-wire approach

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.

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Air Turbines for Wave Energy Conversion

An impulse turbine with self-pitch-controlled guide vanes was proposed by the authors in a previous paper. The unsteady characteristics of this turbine have been investigated experimentally by the use of turbine test equipment in which the sinusoidally reciprocating flow conditions are simulated. The results have been compared with those of a Wells turbine. Furthermore, in order to clarify the usefulness of quasi-steady analysis of this turbine, they have been also compared with the analytical results calculated on the basis of the experimental data obtained by the model testing of a turbine rotor with fixed guide vanes under steady unidirectional flow conditions. As a result, it has been clarified that the impulse turbine presented here is superior to the Wells turbine in overall characteristics, and the quasi-steady analysis is available for this turbine.

Impulse Turbine With Self-Pitch-Controlled Guide Vanes For Wave Power Conversion: Performance Of Mono- Vane Type

Experimental investigations directed towards improving the performance of the impulse turbine with self-pitch-controlled guide vanes are reported. Two types of tandem guide vanes are presented and tested: those with variable-pitch flat-plate and those with variable-pitch splitter. The results show that an impulse turbine of higher efficiency can be developed through the use of the splitter. It is found that, in this case, the upstream guide vanes act as a slotted nozzle blade row and the downstream vanes as a tandem diffuser blade row by changing the pitch angle of the splitter automatically in a reciprocating flow. It is also found that the running and starting characteristics of this turbine in the reciprocating flow can be evaluated from the performance of the turbine with fixed nozzle and diffuser vanes in a unidirectional steady flow.

H. Maeda

Papers

Impulse Turbine With Self-Pitch-Controlled Guide Vanes For Wave Power Conversion: Performance Of Mono- Vane Type

Impulse Turbine With Self-Pitch-Controlled Tandem Guide Vanes For Wave Power Conversion