長方形スリットからの噴流によって発生する離散周波数騒音の研究 : 第3報,スリット口の端板の影響

概要

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Pure tones are unexpectedly generated from slits such as gaps between a window and a pole or a damper when wind is strong. This type of pure tone is referred to as whistle tone in this series of papers. We already clarified the characteristics of whistle tone generated by an air jet from a rectangular slit. That is, it was found that the frequencies of whistle tone noise coincided with those of velocity fluctuation, and that its scale of turbulence, or the range of the coherent area, was comparable to the exit area of the slit used. In the present study, we used a nonsymmetrical slit which had an edge plate on one of the long sides and investigated the effect of the nonsymmetry on the generation of edge tone. The results are summarized as follows : (1) the structure of the vortex is strongly affected by the edge plate, and the sound pressure level becomes smaller, and (2) the fundamental relationship between the generated sound and the velocity fluctuation near the exit of the slit is the same as that in the case of a symmetrical slit.
社団法人日本機械学会の論文
1995-11-25