3720 フィン付き管群からの渦放出に及ぼすフィンピッチの影響(J13-3 流動励起振動3(直交流れによる振動等),J13 流体関連の騒音と振動)

概要

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In the present paper the attention is focused on effect of the fin pitch on vortex shedding from the tube banks with serrated fin. The tube banks were installed rigidly in the test section of the wind tunnel. We measured the spectrum of velocity fluctuation and the freestream velocity in the simulated tube banks which has same pitch ratio as that of a boiler heat exchanger. The vortex of high frequency component mainly formed within the fin-tube banks and the other vortex of low frequency component was in the wake of the fin-tube banks. As the fin pitch became small, the Strouhal number of vortex in the wake of fin-tube banks decreased. The applicability of the equivalent diameter obtained by a single fin-tube to the fin-tube banks was examined. The measured Strouhal number of vortex within the fin-tube banks agreed well with Strouhal number obtained from Fitz-hugh's map for bare-tube banks.
社団法人日本機械学会の論文
2006-09-15