連続溝付き管内の空気流れで生じる音の特性 : 第2報,溝ピッチを変えた場合(流体工学,流体機械)

概要

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An experimental investigation has been carried out for the flow-induced sound in a grooved circular pipe. The length of the pipe is 500mm, the inner diameter is 23mm and the groove pitch is changed from 4mm to 20mm. The velocity in the pipe varied from 6m/s to 66m/s. The characteristics of the sound generated from the pipe are classified into three patterns according to the groove pitch. In the case of the pitch changed from 6mm to 10mm, the resonance of the sound generated for the pipe length occurs by the lock-in phenomenon when the velocity is smaller than 30m/s. Strouhal number based on the groove pitch and the frequency of the sound is summarized the same smooth line when the velocity is larger than 30m/s. The output power of the sound is proportional to the 4th power of the velocity regardless of the groove pitch.
一般社団法人日本機械学会の論文
2006-08-25