J052011 風洞流入の乱れ強度と渦スケールを変化させた場合の翼騒音の計測(〔J052-01〕流体関連の騒音と振動(1))

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  • J052011 Measurement of airfoil noise under the inflow condition of various turbulence intensity and eddy scale

抄録

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.

収録刊行物

  • 年次大会

    年次大会 2013 (0), _J052011-1-_J052011-5, 2013

    一般社団法人 日本機械学会

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