Abstract
Acoustic resonant vibration occurs in a cavity with tube bundle when gas flow reaches a certain velocity. However, it does not always occur even though the condition that vortex shedding frequency coincides with acoustic natural frequency is satisfied. Fluid forces supply energy to acoustic resonant vibration and acoustic vibration consumes this energy to maintain vibration. Acoustic vibration does not occur if energy consumption is greater than energy supply and vice versa. The mechanism of the vibration was discussed in the previous paper [1] and energy consumption was also presented in the paper [2]. In this paper, judgment of vibration is made in terms of energy supply and consumption. Unsteady fluid dynamic force exerted on vibrating cylinders is measured instead of that produced in the flow with acoustic vibration. Energy supplies due to the fluid dynamic force are calculated and compared to the damping force. It was clarified that energy supply and consumption markedly depending upon the shape of cavity and portion of tube bundle.
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