抄録
Noise reduction is a major issue because small propeller-type wind turbines are placed near the lives of people in urban areas. However, the elucidation of the generation mechanism of aerodynamic noise of a small propeller-type wind turbine is not enough. In this study, we conducted noise experiments by changing the tip speed ratio of a small propellertype wind turbine, and conducted RANS analysis and acoustic analysis using FW-H, and compared the results of the two. As a result, SPL increased in the high frequency band as the tip speed ratio increased. The APL around the wing increased with the increase of the tip speed ratio as the blade tip was approached. However, in the vicinity of the blade tip, APL increased on the pressure surface side, but did not increase on the suction surface side due to the effect of tip vortices, and the high APL region decreased.
