気柱共鳴現象発生時の管群から放出される渦の同期化に関する研究

抄録

In the present paper the attention is focused on vortex shedding synchronization in in-line tube banks on acoustic resonance which occurred in the two-dimensional model of boiler. We measured the characteristics of acoustic resonance, the pressure fluctuation on the surface of tubes at the nodes of acoustic pressure and the acoustic pressure fluctuation on the side wall. If the acoustic resonance occurred, the peak level of spectrum of surface pressure difference and the coherence between vortex shedding and wall acoustic pressure in the tube banks also increased. The vortex shedding from the tubes have synchronized with particle velocity fluctuation due to acoustic resonance. We discussed the phase relation between the wall acoustic pressure and measured surface pressures which are related to the lift force on a tube and acoustic particle velocity near the tube.