Experimental Studies In Three Dimensional Turbulent Boundary Layers
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Author | : J. P. Johnston |
Publisher | : |
Total Pages | : 62 |
Release | : 1976 |
Genre | : Boundary layer |
ISBN | : |
The various methods for measurement of the six components of the turbulence stress tensor are reviewed, and some of the data on the turbulent shear stress vector are presented to demonstrate the validity of current ideas for.
Author | : Allen Edward Winkelmann |
Publisher | : |
Total Pages | : 700 |
Release | : 1976 |
Genre | : Turbulent boundary layer |
ISBN | : |
Author | : O. Sendstad |
Publisher | : |
Total Pages | : 130 |
Release | : 1992 |
Genre | : Simulation methods |
ISBN | : |
Author | : Milton George Wille |
Publisher | : |
Total Pages | : 218 |
Release | : 1964 |
Genre | : Aerodynamics |
ISBN | : |
Author | : Stanford University. Thermosciences Division |
Publisher | : |
Total Pages | : 390 |
Release | : 1987 |
Genre | : Turbulent boundary layer |
ISBN | : |
Author | : David Michael Driver |
Publisher | : |
Total Pages | : 268 |
Release | : 1989 |
Genre | : Boundary layer |
ISBN | : |
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 266 |
Release | : 2018-07-24 |
Genre | : |
ISBN | : 9781723575372 |
The effects of a strong adverse pressure gradient on a three-dimensional turbulent boundary layer are studied in an axisymmetric spinning cylinder geometry. Velocity measurements made with a three-component laser Doppler velocimeter include all three mean flow components, all six Reynolds stress components, and all ten triple-product correlations. Reynolds stress diminishes as the flow becomes three-dimensional. Lower levels of shear stress were seen to persist under adverse pressure gradient conditions. This low level of stress was seen to roughly correlate with the magnitude of cross-flow (relative to free stream flow) for this experiment as well as most of the other experiments in the literature. Variations in pressure gradient do not appear to alter this correlation. For this reason, it is hypothesized that a three-dimensional boundary layer is more prone to separate than a two-dimensional boundary layer, although it could not be directly shown here. None of the computations performed with either a Prandtl mixing length, k-epsilon, or a Launder-Reece-Rodi full Reynolds-stress model were able to predict the reduction in Reynolds stress. Driver, David M. and Johnston, James P. Ames Research Center NASA-TM-102211, A-89104, NAS 1.15:102211, NONP-NASA-SUPPL-CD-ROM-93-159790 RTOP 505-60-11...
Author | : Donald Ralph Zimmerman |
Publisher | : |
Total Pages | : 348 |
Release | : 1975 |
Genre | : Turbulent boundary layer |
ISBN | : |
Author | : A. E. Winkelmann |
Publisher | : |
Total Pages | : 191 |
Release | : 1976 |
Genre | : |
ISBN | : |
Experimental studies of a two and a three-dimensional low speed turbulent boundary layer were conducted on the side wall of the University of Maryland Boundary Layer Wind Tunnel. Preliminary studies in the two-dimensional boundary layer indicated that the flow was nonuniform on the 46 in. wide test wall. The nonuniform boundary layer is characterized by transverse variations in the wall shear stress and is primarily caused by nonuniformities in the inlet damping screens. Over the 15 in. span of a special transverse device, the local skin friction coefficient varied (at discrete locations) + or - 9% about a mean. Transverse variations in the flow velocity, yaw, pitch and turbulence intensity were also measured in the boundary layer at set distances above the wall. Measurements with a pitch probe revealed the presence of a vortex-like flow to exist above the edge of the boundary layer at two locations along the 15 in. traverse line.
Author | : A. K. Anand |
Publisher | : |
Total Pages | : 228 |
Release | : 1977 |
Genre | : Axial flow compressors |
ISBN | : |