Aerodynamic noise radiated from a rotating cylinder

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  • 回転円柱から放射される空力音(J13-1 空力音I,J13 流体関連の騒音と振動)

Description

In order to control the aerodynamic noise radiated form bluff bodies, vorticity structures and flow field around a rotating circular cylinder at Reynolds numbers between 10^2 and 10^4 were numerically simulated. Aerodynamic force and resultant aerodynamic noise is drastically changed with the ratio of the uniform velocity and the rotational velocity of the cylinder. At low velocity ratio, anti-symmetric vorticity structures are generated behind the cylinder and lift-drag ratio is rapidly increasing. On the other hand, an absolute value of lift-drag ratio is reducing over the velocity ratio of 2. As a result, aerodynamic forces turn weakness and the resulting aerodynamic sound becomes small. The noise level of the rotational cylinder is 10 dB lower than that of the conventional circular cylinder.

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