試験風車翼の広帯域音源(流体工学,流体機械)

概要

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While researches to reduce a broadband noise from wind turbine rotor blade had been conducted successfully, a generation mechanism of the noise particularly from around the tip area is yet to be elucidated and thus a further research for the noise reduction is expected. For this purpose, we had developed microphone array systems to evaluate acoustic performances of the 15m diameter experimental wind turbine rotor blade and conducted the acoustic tests of the blade. Results of the tests revealed that the blade emits strong high frequency broadband noise from its extreme tip and the mid-frequency noise from the trailing edge. This result suggests that the generation mechanism of the high frequency noise is believed due to the stream-wise vortices shed directly from the extreme tip which is different from results of wind-tunnel tests of three dimensional airfoils.
一般社団法人日本機械学会の論文
2004-04-25