2013 Volume 79 Issue 808 Pages 2577-2581
This paper illustrates the results of a wind tunnel experiment for the measurement of aeroacoustic noise from a straight-bladed vertical-axis wind turbine (VAWT). The measurement of the sound pressure was conducted by using microphone arrays composed of 16 microphones. At the side of the VAWT where the relative wind velocity that acts on a blade becomes maximum, it was observed that the existence of the blades led to a broadband sound from 400 Hz to 6300 Hz. In addition, the possibility was confirmed that aeroacoustic noise from blade tips at 1250 Hz become more prominent with an increase in the tip speed ratio and in the blade pitch angle amplitude. Above the VAWT, it was found out that the horizontal position where the sound level was the highest varied with the tip speed ratio, blade pitch angle amplitude and eccentric angle.