Accession Number : ADA292113

Title :   The Effects of Three-Dimensional Imposed Disturbances on Bluff Body Near Wake Flows: Effects of Taper and Splitter Plates on the Near Wake Characteristics of a Circular Cylinder in Uniform and Shear Flow.

Descriptive Note : Final rept.,

Corporate Author : NOTRE DAME UNIV IN DEPT OF AEROSPACE AND MECHANICAL ENGINEERING

Personal Author(s) : Anderson, Elgin A. ; Szewczyk, Albin A.

PDF Url : ADA292113

Report Date : APR 1994

Pagination or Media Count : 320

Abstract : The near wake characteristics of a circular cylinder were modified by use of splitter plates, cylinder taper, and shear flow to investigate the relationship between the various near wake parameters. The results are based on hot wire and mean pressure measurements, flow visualization of the near wake, and linear stability analysis of the shear layer. The straight cylinder variation in Strouhal number with respect to splitter plate length was divided into four regions identified by the flow phenomenon that dominates the shedding frequency selection namely, stabilizing, shear layer elongation, reduced entrainment, and splitter plate-vortex interaction. A sinuous plate increased the 2-dimensionality of the shear layer compared to the straight plate and affected the spanwise coherence of the Karman vortices. However, within the formation region the sinuous splitter plate produced results similar to those produced by a straight plate of equal average length. (AN)

Descriptors :   *WAKE, *SHEAR FLOW, STABILITY, EXPERIMENTAL DATA, PARAMETERS, POWER SPECTRA, FLOW VISUALIZATION, VORTEX SHEDDING, VARIATIONS, CYLINDRICAL BODIES, PLATES, BUBBLES, WIND TUNNEL TESTS, PRESSURE DISTRIBUTION, NEAR FIELD, REYNOLDS NUMBER, ELONGATION, ENTRAINMENT, HOT WIRE ANEMOMETERS, CROSS CORRELATION, BOUNDARY LAYER FLOW, FREQUENCY ALLOCATION, TRAILING EDGES, THREE DIMENSIONAL FLOW, DRAG REDUCTION, STROUHAL NUMBER.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE