The dynamic character of the hemisphere-cylinder wake

The dynamic character of the hemisphere-cylinder wake  The dynamic character of the hemisphere-cylinder wake was studied over the entire range of angles of attack, i.e. α=0° to 90°. The work was carried out in two wind tunnel facilities, using hot-wire anemometry. Velocity auto- and cross-spectra in the wake reveal that the leeward vortices exhibit periodic motions, with multiple dominant frequencies for 24°<α<42°, one single dominant frequency for 15°<α<22°, while no periodic activity is detected for α<15°. In the regime 15°<α<42°, a new periodic heaving motion of the vortices is documented. Vortex heaving transitions to the more classical vortex shedding periodicity in the neighborhood of α=45°. Above α=55°, vortex shedding occurred at a single Strouhal number of 0.15. The limiting case α=90° was investigated in detail for semi-infinite and finite hemisphere-cylinder models and comparisons were made to axisymmetric bodies with different nose shapes. Experiments in Fluids Springer Journals

The dynamic character of the hemisphere-cylinder wake

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Copyright © 1999 by Springer-Verlag Berlin Heidelberg
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
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