0125 管群を有するダクト内の音速評価に関する研究(J18-2 機械と環境の騒音評価,低減技術(2),J18 機械と環境の振動・騒音評価,低減技術の新展開)

概要

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As tube banks are set in a duct in a boiler and a heat exchanger, the resonance phenomenon or the self sustained tone are generated due to the interference between a vortex shedding and an acoustic characteristic of duct. It is necessary to know the resonance frequency of the duct, namely sound speed, for avoiding any trouble that may arises. In general, it is said that the sound speed decreases in the duct with tube banks and an evaluation formula is given. However this formula is obtained to apply to the perpendicular direction to the flow. We want to know that this formula is able to apply to the flow direction and to various array patterns or not. Then in this paper, applicability limit of this expression is discussed by using FEM analysis and experiments.
2007-09-07