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
2006 年 72 巻 720 号 p. 1960-1968
詳細
2006 年 72 巻 720 号 p. 1960-1968
An experimental investigation has been carried out for the flow-induced sound in a grooved circular pipe. The length of the pipe is 500 mm, the inner diameter is 23 mm and the groove pitch is changed from 4 mm to 20 mm. The velocity in the pipe varied from 6 m/s to 66 m/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 6 mm to 10 mm, the resonance of the sound generated for the pipe length occurs by the lock-in phenomenon when the velocity is smaller than 30 m/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 30 m/s. The output power of the sound is proportional to the 4 th power of the velocity regardless of the groove pitch.
