101 気柱共鳴騒音に及ぼす格子配列管群内のキャビティの影響(振動・騒音の実験・解析技術(1),騒音・振動改善技術)

概要

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In the present paper the attention is focused on the effect of cavities inside of in-line tube banks on vortex shedding. The relation between vortex shedding characteristics inside of in-line tube banks and that of cavity without acoustic resonance was experimentally examined. We measured the sound pressure level, the phase delay of acoustic pressures, the spectrum of velocity fluctuation and the gap velocity. As a result, the vortex shedding of S_t=0.15 were generated inside of the tube banks and the cavity without acoustic resonance. The velocity fluctuation of S_t=0.15 inside of the cavity downstream of fifth row tubes was larger compared with the results of no cavities. The existence of cavities of tube pitch ratio of 3.44 inside of in-line tube banks caused the resonance of S_t=0.15 component.
一般社団法人日本機械学会の論文
2005-07-06