1508 乱流中に置かれた二次元鈍頭物体から放射される空力騒音と後流の静圧変動の関係について(J11-2 流れと音の相関計測,J11 流体関連の騒音と振動)

概要

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In order to clarify the effect of incoming flow turbulence, aerodynamic noise and static pressure fields were measured in a low-noise wind tunnel with an active turbulence generator. The experimental results showed that influence of turbulence intensity for aerodynamic noise generation was not clear. However, the noise levels depended on the eddy scale of the uniform flow. The distributions of the static pressure in the wake of the circular cylinder were also measured with and without the active turbulence generator. Since the eddies which is almost the same size have an inclination to interfere in each other, Karman vortex disappeared when the case of the scale of eddies were almost the same as the diameter of the cylinder. Therefore, the resultant noise decreased.
社団法人日本機械学会の論文
2007-09-07