千鳥配列の管群からの渦放出特性と気柱共鳴現象 : 流体工学,流体機械

概要

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The relation between flow induced acoustic resonance and vortex shedding from the tube banks was experimentally investigated. We measured sound pressure level near the duct exit and the vortex shedding frequency, the intensity of velocity fluctuation and the spectrums of velocity fluctuation in the tube banks by using a tube banks model which has same pitch ratio as that of a boiler heat exchanger. We found three types of vortex shedding with different Strouhal number, 0.29, 0.22 and 0.19. The vortex shedding of St =0.29 and 0.22 are generated inside of the tube banks, other one of 0.19 is in the wake of the last row of the tube banks. The velocity fluctuation and the periodicity of the vortex shedding from the second row of the tube banks are the most intense in the tube banks. The amplitude of velocity fluctuation due to the vortex shedding became large in accordance with the generation of the acoustic resonance which has the fundamental natural frequency of the acoustic resonance in the transverse direction of the duct.
一般社団法人日本機械学会の論文
2001-08-25