衝突噴流によって発生する空力音と渦構造 : 物体からはく離する渦の影響

概要

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A two-dimensional jet impinging on a body generates an aerodynamic sound. Although frequency of the sound is predicted on the basis of the feedback mechanism, the sound level cannot the-oretically be obtained, partly because the effect of vortices separated from the surface on the feedback mechanismis not understood yet. In this paper, the sound and structure of the jet vortices impinging on the surface were experimentally studied by changing the shape of the body to realize different flow separation from the surface. The body was a circular cylinder and an aerofoil whose leading edge was a semicircle with the same radius as the cylinder. Phase-averaged vorticity and surface-pressure distibutions were presented. The sound level was generally higher, the jet vortices impinging on the surface were more compact, and the rms surface pressure was much higher for the circular cylinder than for the aerofoil.
一般社団法人日本機械学会の論文
1993-09-25