The types of turbine included in the paper are summarized as follows. This paper describes the present state of the art of air turbines for wave energy conversion. The energy conversion from an oscillating air column can be achieved by using a system of nonreturn valves for rectifying the airflow, together with a conventional turbine. In such wave energy devices, a water column which oscillates due to wave motion is used to drive an oscillating air column which is converted into mechanical energy. Figure 1 shows the principle of OWC-based wave energy conversion and its energy conversion chain. Several of the wave energy devices being studied under many wave energy programs in the United Kingdom, Japan, Portugal, India, and other countries make use of the principle of an oscillating water column (OWC). Moreover, as the current challenge on turbine technology, the authors explain a twin-impulse turbine topology for wave energy conversion. 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. 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. The air turbines included in the paper are as follows: Wells type turbines, impulse turbines, radial turbines, cross-flow turbine, and Savonius turbine. Send resume and salary requirements by email to MD&A is an equal opportunity employer.This paper describes the present status of the art on air turbines, which could be used for wave energy conversion. MD&A provides an excellent full range benefits package.
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