Session GA: Turbulent Boundary Layers: Experiments II
8:00 AM–9:57 AM, Monday, November 23, 2009
Room: 101A
Chair: Beverley McKeon, California Institute of Technology
Abstract ID: BAPS.2009.DFD.GA.9
Abstract: GA.00009 : A turbulent boundary layer on a rough wall at hypersonic speeds
9:44 AM–9:57 AM
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Abstract
Authors:
Dipankar Sahoo
(Princeton University)
Parthav Desai
(Princeton University)
Alexander Smits
(Princeton University)
Previous experiments on hypersonic turbulent boundary layers have documented the general features of the mean flow behavior on a smooth plate, but virtually no data exist describing the boundary layer behavior on a rough wall for Mach numbers greater than about 5. Here, we report PIV measurements of the mean flow and two components of velocity fluctuations on a flat plate with three different roughness geometries: a square bar roughness, and two diamond roughness elements of different height. The boundary layer develops at Mach 7.2 in a perfect gas, at a Reynolds number based on momentum thickness of about 3600. The results are compared with DNS under identical flow conditions. Supported under NASA Grant NNX08AB46A, Program Manager Catherine McGinley.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.DFD.GA.9