267 気柱共鳴現象と渦放出に及ぼす格子配列管群の管ピッチ比の影響(空力音響現象のメカニズムと計測制御,OS-22 流体関連振動・音響メカニズムと計測制御,総合テーマ「伝統を,未来へ!」)

概要

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In the present paper the attention is focused on effect of arrangement of in-line tube banks on vortex shedding, acoustic damping and acoustic resonance which occurred in the two-dimensional model of boiler. We have examined the characteristics of vortex shedding, acoustic damping and acoustic resonance generated from in-line tube banks with tube pitch ratio of 1.33, 1.44, 1.56, 1.67, 1.76 and 2.0 in the flow direction. As the tube pitch ratio in the flow direction decreased, the acoustic damping increased and the vortex shedding frequency became broad-band. The resonance mode of low acoustic damping was generated in the broad-band vortex shedding frequency. It was easy to generate acoustic resonance of low order transverse mode as the tube pitch ratio in the flow direction increased.
一般社団法人日本機械学会の論文
2010-09-14