Fundamental Aspects of the Structure of Supersonic Turbulent Boundary
Fundamental Aspects of the Structure of Supersonic Turbulent Boundary

Author: Jonathan H. Watmuff

Publisher:

Published: 1987

Total Pages: 41

ISBN-13:

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Measurements of structure angle in a supersonic turbulent boundary layer with zero and adverse pressure gradients are presented. Conditionally sampled measurements of u, v, and uv are presented along with quadrant analysis of the turbulent fluctuations. The latter suggests ambiguities associated with the interpretation of VITA measurements. Preliminary results of experiments on artificially generated hairpin vortices are also discussed. Measurements indicate a high degree of similarity between the signatures of these hairpin structures and ensemble averaged events in the turbulent boundary layer. Keywords: Turbulence, Boundary layer, Supersonic Flow.

Fundamental Aspects of the Structure of Supersonic Turbulent Boundary Layers
Fundamental Aspects of the Structure of Supersonic Turbulent Boundary Layers

Author:

Publisher:

Published: 1988

Total Pages: 0

ISBN-13:

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This three-year contract originally had two tasks: to investigate the structure of flat plate supersonic turbulent boundary layers (Task A), and to investigate longitudinal curvature effects in turbulent boundary layers (Task B). As a result of the work performed under these task headings, we identified a need to study the structure of simple, wall-bounded vortex loops. This investigation (Task C) commenced in the third year, and we feel that it has made a major contribution to our understanding of the ensemble-averaged structure of low and high speed turbulent boundary layers. The progress reported here is that achieved in completing these three tasks. Keywords: Turbulent flow; Eddies(Fluid mechanics); Flow visualization.