Abstract
Aerodynamic noise emitted from bluff bodies is considerably reduced when they are covered with porous material. In this study, to investigate a mechanism of aerodynamic noise reduction, wind tunnel tests were conducted using a cylinder with holes that are able to blow air from the inside to the outside. As a result, it has been found out that peak noise level generated from the cylinders with holes is reduced compared to that from a bare cylinder, and that the flow similar to that behind a cylinder with porous material is generated behind the cylinders with holes. The reason why porous material can reduce aerodynamic noise is probably that a flow in the direction vertical to the circumferential surface of a cylinder caused by the porous material moves shear layer outside and vortex development near the cylinder is suppressed.
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