Using a microphone array, a wind tunnel experiment for a straight-bladed vertical-axis wind turbine (VAWT) was carried out to investigate the effects of the arm's cross-sectional shape on the power performance and aeroacoustic noise. As a result, the amount of power reduced by the ellipse arms was significantly smaller than the rectangle arms and slightly larger than the airfoil arms. In addition, the values of the overall A-weighted sound pressure level (OASPL) in the case of using the ellipse

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... arms were significantly lower than those of using the airfoil arms and almost the same as the rectangle arms. Also, at the high frequency range, A-weighted SPL of the ellipse arm case was significantly lower than that of the airfoil arm case.