622 ボイラにおける管群気柱共鳴と吸音構造による抑止法の研究(管群及び二相流による振動)(OS.17 : 流体関連振動のダイナミクスと制御)

概要

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This paper deals with the acoustic resonance in tube bundles which occurred in actual boiler plants. Using the acoustic energy absorber, practical method to suppress the resonant noise is proposed based on scale model tests. In this experiments, besides the transverse direction modes, longitudinal modes which are difficult to suppress are realized. The relation of both kinds of acoustic modes to vortex shedding frequency is clarified. In the next step acoustic energy absorbers are equipped in the duct and remarkable increase of the critical flow velocity is confirmed. Based on these results, this method was applied to the in-situ boiler plants and it was confirmed that the proposed method is effective to suppress both type of acoustic resonant modes.
一般社団法人日本機械学会の論文
2001-08-03