Abstract
Recently, it has been a problem of aerodynamic noise radiated from wind turbine blades, and noise prediction of the wind turbine is important. Many airfoil noise studies by using the wind tunnel tests are carried out under the inflow condition with low turbulence, however usual airflow has a certain degree of turbulence. Then, airfoil noise under the various inflow conditions is measured by using the active turbulence generators (ATGs) in this study. The ATGs have 3 size of rotating plates with changing various swing angles in order to be varied independently turbulence intensity and eddy scale. In this paper, it is reported that the turbulence intensity and the eddy scale of inflow can be changed at 7 % to 20 % and at 18 % to 30 %, respectively. Also, it is cleared that sound pressure level of airfoil noise are increased by 5 to 15 dB in broadband frequency range of 100 to 5000 Hz in case of increase of turbulence intensity, and that the sound pressure level are increased by 5 to 15 dB in the range of 100 to 300 Hz in case of increase of eddy scale.
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