849 気柱共鳴現象による管群から放出される渦の同期化とそのモデリング

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  • 849 Modeling Method of Vortex Shedding Synchronization in Heat Exchanger Tube Banks on Acoustic Resonance

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In the present paper the attention is focused on verification of modeling method of vortex shedding synchronization on acoustic resonance which occurred in the tube banks of two-dimensional model of boiler. We have proposed the modeling method of the resonance level dependence of vortex shedding synchronization because this is the most essential part of critical flow velocity prediction. In this method, the relationship of vortex shedding and the sound field in an arbitrary tube is expressed by a statistical model where the effect of resonance on the wake-oscillator is expressed by the width of the fluctuation range of phase between wake-oscillator and acoustic particle velocity. To verify this model, we measured the pressure fluctuation on the surface of tubes at the nodes of acoustic pressure and the acoustic pressure on the side wall of the duct when the acoustic resonance occurred in in-line tube banks with tube pitch ratio from 1.44 to 4.0 in the flow direction. As the peak level of spectrum of surface pressure fluctuation increased, the coherence between vortex shedding and wall acoustic pressure in the tube banks also increased. The features of experimental results agree well with those obtained by using the proposed modeling method.

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