気柱共鳴現象発生時の管群内および最後列の管からの渦放出特性

抄録

In the present paper the attention is focused on vortex shedding synchronization in in-line tube banks on acoustic resonance. We measured the surface pressures related to the lift force on a tube and acoustic pressure on a side wall related to the acoustic particle velocity when acoustic resonance occurred in in-line tube banks. The gap velocity was changed from 0 to 30.0 m/s during 95 seconds gradually. The tube pitch ratios of tube banks in the flow direction were 2.0, 2.8, 3.5, 4.0 and the transverse direction was 2.0. The measured tube was installed at the second and last rows in the tube banks. As the tube pitch ratio of tube banks in the flow direction decreased, the g growth of acoustic resonance became rapidly. We estimated the phase relation between the time data which were related to the lift force on a tube and acoustic particle velocity near the tube. In addition, we discussed the verification of the synchronization feedback for a coupling condition between a sound field and wake oscillator.