241 気柱共鳴現象による管群から放出される渦の同期化に関する研究

概要

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In the present paper the attention is focused on synchronization characteristics of vortex shedding from tube banks on acoustic resonance which occurred in the two-dimensional model of boiler. We measured the pressure fluctuation on the surface of tubes at the nodes of acoustic pressure and the acoustic pressure on the side wall of the duct when the acoustic resonance occurred in in-line tube banks with tube pitch ratio of 2.8 and 4.0 in the flow direction. When the acoustic resonance was generated in the duct, the correlation of vortices and the resonance acoustic pressure became intense along the transverse direction of duct. The vortices shedding from the tubes have synchronized with particle velocity fluctuation in the duct. The pressure fluctuation on the surface of tubes increased because the periodicity of vortices shedding became intense on acoustic resonance. As the gap velocity increased, the resonance acoustic pressure on the duct wall was delayed from the pressure fluctuation on the surface of test tubes due to vortex shedding.
一般社団法人日本機械学会の論文
2011-09-05