流動解析手法を用いた管群による気柱振動励振力の予測

概要

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The acoustic exciting forces in a duct where a bundle of tubes are in staggered arrangement at a pitch-to-diameter ratio of 2.0 were analyzed using a finite-volume technique which the authors developed on the basis of the GSMAC (Generalized Simplified Marker and Cell) method. Forced oscillating flows with a constant frequency which are perpendicular to a main flow were employed for the analysis of the acoustic vibration field. The fluctuating lift forces on individual tubes in the flow field where the main flow and oscillating flows exist were calculated two-dimensionally. The calculated lift amplitude and the calculated phase difference between the fluctuating lift and the acceleration of forced oscillation, which affects the stability of the acoustic vibration were in good agreement with the values measured in experiment. The finite-volume technique can now be applied to the analysis of acoustic vibrations in the sound field of a duct installed with a bundle of tubes arranged differently.
社団法人日本機械学会の論文
1995-05-25