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1報,笛音の発生条件

概要

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Pure tones are unexpectedly generated from slits such as a gap between a window and a pole or a damper when wind is strong. We named this type of pure tone as a whistle tone. As the first stage of this study we made clear that the whistle tone was generated by air jet flow from a rectangular slit. The geometry of the slit and the velocity of the jet flow had important effects on the generation of discrete frequency noise (DFN). Those parameters to cause the generation of DFN were limited within certain ranges. The frequency of whistle noise was linearly related to the jet velocity, which means that the mechanism of the generation of whistle noise is different from that of screech noise and the tone caused by an interaction between the jet and a solid body in the jet stream.
1994-01-25