衝突噴流による空力的自励音の発生条件

概要

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Experiments were performed on the aerodynamic sound generated by the two-dimensional jet impinging on a rectangular prism to understand the effects of the cross-sectional aspect ratio of the prism on the sound. The aspect ratio b/h, where b is the width and h is the height of the cross section, was varied in the range 1.0-30.0. The sound pressure level increased with increasing width to attain a constant value beyond a critical width b_c, which was approximately given by b_c=5h for different heights h. The critical width was interpreted as the distance between the leading edge of the prism and a position where the time-mean surface pressure recovered to the surrounding pressure from a lower pressure. Profiles of the time-mean and r.m.s. fluctuating surface pressures and velocities near the leading edge of the prism revealed the relationship between the sound and the flow field.
社団法人日本機械学会の論文
1994-10-25