Turbulence Induced Changes in Vortex Shedding from a Circular Cylinder.
COLORADO STATE UNIV FORT COLLINS FLUID MECHANICS PROGRAM
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Turbulence effects on vortex shedding from a circular cylinder were investigated in a wind tunnel. Turbulence intensity, near the center of a wind tunnel, was increased by plates of similar geometry with many small holes with blockage ratios from .50 to .97. The Re of all flows was kept near 40,000. Vortex shedding frequency was observed simultaneously by a pressure transducer and a hot wire anemometer. Flow visualization, spectra and transducer output voltages with different wake anples were utilized to estimate transition and separation. Six things were observed that have not been published, to the best of the authors knowledge. Modified author abstract
- Fluid Mechanics