A variety of designs of self-rectifying air turbines for wave power conversion have been proposed over the last decade. However, the noise characteristics of the turbines have not been presented so far. In order to clarify the noise characteristics of the turbines, experimental investigations have been performed under steady flow conditions in this study. As a result, it is found that the noise characteristics of impulse-type turbines are superior to those of Wells-type turbines. Moreover, the noise characteristics have been discussed from the viewpoint of the specific noise level, a term used widely in engineering.
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