Effect of Arrangement of Tube Banks on Vortex Shedding Synchronization

Abstract

This paper investigated the effect of arrangement of tube banks on vortex shedding synchronization due to acoustic resonance. We measured the time variation of a phase between 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 measured tube was installed at the second rows in the tube banks. As the peak level of spectrum of surface pressure fluctuations increased, the coherence between vortex shedding and wall acoustic pressure in the tube banks also increased. 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. Comparing this result with the analytical results, we reached to the conclusion that the acceleration feedback was most reasonable type of feedback. We discussed also the effect of arrangement of tube banks on vortex shedding synchronization.