This paper investigates the phase characteristics of vortex shedding from tube banks on 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. The phase delay between the lift force and acoustic pressure on the side wall was calculated by using a proposed modeling method. In addition, we discuss the verification of the synchronization feedback for a coupling condition between a sound field and wake oscillator.

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