Abstract
Three normal triangle tube arrays have been tested to investigate the phenomenon of vortex shedding, its relation to the occurrence of acoustic resonance and the dynamic fluid forces exerted on the tubes. The tests include velocity, pressure and force measurements, as well as extensive visualization of the flow structure at resonant and nonresonant conditions. Three vorticity-shedding components have been observed: a high-frequency component,fv2, associated with alternating vortex shedding from the front rows; a low-frequency component,fv1, due to alternating vortex shedding from the rear rows; and a third component,fvd, resulting from the nonlinear interaction betweenfv1andfv2. For small spacing arrays, thefv1at the rear rows is hardly discernible. When the spacing is increased, it gains strength continuously until it dominates the whole array at large spacing ratios, where the high-frequency componentfv2subsides. The study focuses upon the effects of the Reynolds number and the location within the array on the vorticity-shedding components and their relative importance with respect to the excitation of acoustic resonance. Data of the dynamic lift coefficient and bound spectra of turbulent fluid forces are also provided.
Published Version
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