1509 流れの可視化を用いたキャビティ音発生機構に関する研究(J11-2 流れと音の相関計測,J11 流体関連の騒音と振動)

概要

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In order to clarify the generation mechanism of aerodynamic sound from a cavity, aerodynamic sound and flow fields around a cavity were measured with a high speed flow visualization system. In this experiment, deep cavities were used; however, acoustic resonance was removed with acoustic insulator. The flow visualization results showed that the two large scale vortices were observed in the cavity. When the first vortex attached the downstream edge of the cavity, sound level was low. The sound level was increasing with the vortex impinging the edge of the cavity. When the center of the vortex core reached the edge of the cavity, the sound level reached maximum level. And sound level gradually reduced because vortex core through the edge. The dynamic PIV can be captured vortex deformation. We also visualized vortex structures around a round edge cavity. In the case of the round edge cavity, vortex deformation was alleviated. As a result, the resultant sound was reduced. These results indicated that the deformation of eddies play an important role with the aerodynamic sound generation.
一般社団法人日本機械学会の論文
2007-09-07