有限長直管内に凹凸棒を挿入した場合の気流による共鳴現象

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タイトル別名
  • ユウゲンチョウ チョクカンナイ ニ オウトツボウ オ ソウニュウシタ バアイ
  • Resonance of the pipe flow in the case of inserting rugged rod in the circular pipe of finite length

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An experiment has been carried out on a sympathetic sound of the pipe flow in the case of inserting rugged rod in the circular pipe of 500mm length. One of the experimental condition was constant of the cross section area in the pipe; the rugged pitch of 8, 10, 14 or 20mm were used. The other condition was constant of the pitch (8mm); the cross section area was varied. The oscillation frequency of the air column in the pipe depended on rugged pitch. And the resonance sound of the pipe flow was generated in 8 or 10mm pitch of rugged rod but in 20mm pitch it was not generated. There was not case of generation of sympathetic sound for differing from cross section area. And it was found that dominant frequency was changed into like a stair in comparison with the velocity in the pipe according to the frequency analysis of the sound pressure fluctuation.

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