Experiments on Vortex Shedding Behind Linearly Tapered Cylinders
Experiments were performed to study the flow behind a linearly tapered cylinder, in order to gain more information about laminar vortex shedding behind the cylinder, the evolution of the velocity field in the far wake of the cylinder, and also chaotic vortex shedding behind the cylinder. For laminar vortex shedding, scalings were found for the shedding frequency, difference frequency, and shedding cell size. The behavior of the cylinders was found be less orderly as the amount of taper increased. In the far wake, the velocity fluctuations evolve in two phases to chaos, partially by transferring energy from high to low frequency. In the chaotic case, the rigid positioning of the cell boundaries breaks down, so that the number of vortices shed by cylinder becomes a monotonic function of spanwise position.
KeywordsModulation Frequency Flow Visualization Strouhal Number Vortex Line Bluff Body
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