Effect of Cylinder Location inside a Rectangular Duct on the Excitation Mechanism of Acoustic Resonance
Keywords:Aeroacoustics, Flow-excited Acoustic Resonance,
AbstractThe flow-sound interaction mechanism of a single cylinder in cross-flow is investigated experimentally. The cylinder is located at different vertical locations inside a rectangular duct in order to investigate the effect of the cylinder location on the excitation mechanism of acoustic resonance. During the tests, the acoustic cross-modes of the duct housing the cylinder are self-excited. It is found that the cylinder location affects the process of the flow-excited acoustic resonance and the levels of the generated acoustic pressure. The resonance of a specific acoustic cross-mode is excited when the cylinder is located at the acoustic pressure node, or the acoustic particle velocity anti-node, of that acoustic cross-mode. However, when the cylinder is shifted away from the pressure node of a certain acoustic cross-mode, a combination of cross-modes is excited and their intensity seems to be proportional to the ratio of the acoustic particle velocities of these modes at the cylinder’s location. Moreover, as the cylinder moves closer to the top wall of the rectangular duct, the Strouhal number value decreases due to the interference between the wake of the cylinder and the duct wall. Therefore, the onset of acoustic resonance for this case occurs at a higher value of reduced flow velocity.
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