Accession Number : ADA192997

Title :   Experimental Study of Unsteady Separating Turbulent Boundary Layers.

Descriptive Note : Final technical rept.,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF AEROSPACE AND OCE AN ENGINEERING

Personal Author(s) : Agarwal, N K ; Simpson, R L

PDF Url : ADA192997

Report Date : Feb 1988

Pagination or Media Count : 189

Abstract : A detailed experimental study of two large amplitude unsteady freestream flows and a third unsteady flow produced by an oscillating roof damper is reported. Detailed ensemble-averaged velocity and turbulence measurements were made using hot-wire and laser anemometers. While the primary function of this report is to present and document these data, some discussion of the results and a number of data plots are presented. The reduced data are available on computer diskettes. Upstream of detachment at the phases with no flow reversal, the flows are quasi-steady. For the large amplitude flows, at low velocity phases some flow reversal occurs upstream of detachment, which was not observed in the moderate amplitude flow studied by Simpson et al. (1983). After the beginning of detachment, large amplitude and phase variations develop through each flow. Huge backflow velocities, as large as free-stream, were measured. Keywords: Unsteady flows, Laser anemometry, Turbulence, Separation.

Descriptors :   *TURBULENT BOUNDARY LAYER, *UNSTEADY FLOW, *FLOW SEPARATION, AMPLITUDE, BACKFLOW, DAMPING, DATA MANAGEMENT, DATA REDUCTION, LASER ANEMOMETERS, LOW VELOCITY, MEASUREMENT, OSCILLATION, PHASE, PLOTTING, REVERSIBLE, TURBULENCE, VARIATIONS, VELOCITY, FREE STREAM, HOT WIRE ANEMOMETERS, COMPUTER APPLICATIONS

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE