Abstract
In the present paper the attention is focused on reduction of noise generated from rectangular cylinders in cross flow. The width-to-height ratios of was 3.0. The tube pitch ratio in the transverse direction was 8.0. We measured the aerodynamic sound radiated from the rectangular cylinders in the range of Reynolds numbers from about 10^3 to 10^4. The several high peaks were formed at the spectrum of SPL. The sound power of vortex shedding noise was proportional to the freestream velocity to the power of six. On the other hand, the strange noise occurred at five times the vortex shedding frequency. We have discussed how to counteract the noise generated by rectangular cylinders.
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