1222 音響ホログラフィ法を用いた空力騒音計測に関する研究第 2 報 : 離散周波数騒音への応用

概要

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A system and a procedure shown in a previous report, which can identify location of sound source by near-field acoustic holography method using sound fields apart from the source measured with a small pressure transducer in a uniform flow, was applied to detection of a discrete frequency noise, DFN. It has been verified that three-dimensional distributions of sound fields can be estimated fairy well with this system from the tests for pressure fluctuations on a circular cylinder. Moreover, sound pressure distributions over the entire surface of a flat plate aerofoil with various boundary layer manipulations were estimated. As a consequence of additional consideration with an aid of experimental data of pressure fluctuations on aerofoil as well as coherent flow structures near it, four different types of DFN generating mechanisms have been proposed.
社団法人日本機械学会の論文
2002-09-20