多孔板の流体励起振動 : 渦の発生メカニズムと周波数に関する実験研究

概要

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A flow past a perforated plate produces a whistle or vibration. So to elucidate such phenomena, an experimental study was conducted on the production of ring vortices from plates containing a single or some holes. The mechanism and frequency of vortex shedding was determined as a function of the Reyolds of the jet. At Reynolds numbers below 3000, vortex rings are formed in the circular jets with a Strouhal of 0.6. This phenomena is not influenced by the hole length. At Reynolds numbers above 3000, vertex rings with a Strouhal number of 1.6 are formed at the entrance of a hole after their fovmation some vortex rings combine with other in the hole of at the downstream of the hole. Hence in this way the 1/2, 1/3 and 2/3 components of original frequency St=1.6 are measured.
社団法人日本機械学会の論文
1988-07-25