AM05-23-006 柔毛による翼から放射される空力騒音の低減効果(騒音2,一般講演)

概要

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In this paper we attempted to clarify effect of pile fabrics or surface lining on aerodynamic noise reduction. Aerodynamic noise and velocity fields of a two-dimensional NACA0012 airfoil were measured in a low noise wind tunnel. The effects of pile fabrics were evaluated with parametric survey, mounting positions and thickness of pile fabrics. The experimental results showed that the pile fabrics reduced aerodynamic noise, but aerodynamic force were also reduced. Then, the noise reduction effect was restricted. The noise reduction effects depend on the mounting position of pile fabrics. Aerodynamic noise can be effective reduced when the pile fabrics placed near the trailing edge. Reynolds stresses around the airfoil were measured by LDV. As a result, Reynolds stress of the airfoil with pile fabrics was reduced about 70% than that of the solid airfoil. It revealed that noise reduction effects of pile fabrics come from the reduction of Reynolds stress.
日本流体力学会の論文
2005-09-05