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Laser Interferometer Skin-Friction measurements of crossing-shock wave/turbulent boundary-layer interactionsWall shear stress measurements beneath crossingshock wave/turbulent boundary-layer interactions have been made for three interactions of different strengths. The interactions are generated by two sharp fins at symmetric angles of attack mounted on a flat plate. The shear stress measurements were made for fin angles of 7 and 11 degrees at Mach 3 and 15 degrees at Mach 4. The measurements were made using a Laser Interferometer Skin Friction (LISF) meter; a device which determines the wail shear by optically measuring the time rate of thinning of an oil film placed on the test model surface. Results of the measurements reveal high skin friction coefficients in the vicinity of the fin/plate junction and the presence of quasi-two-dimensional flow separation on the interaction centerline. Additionally, two Navier-Stokes computations, one using a Baldwin-Lomax turbulence model and one using a k-~ model, are compared to the experimental results for the Mach 4, 15 degree interaction case. While the k-~ model did a reasonable job of predicting the overall trend in portions of the skin friction distribution, neither computation fully captured the physics of the near surface flow in this complex interaction.
Document ID
19930064250
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Garrison, T. J.
(NASA Ames Research Center Moffett Field, CA, United States)
Settles, G. S.
(Pennsylvania State Univ. University Park, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1993
Subject Category
Instrumentation And Photography
Report/Patent Number
AIAA PAPER 93-3072
Meeting Information
Meeting: AIAA, Fluid Dynamics Conference
Location: Orlando, FL
Country: United States
Start Date: July 6, 1993
End Date: July 9, 1993
Sponsors: AIAA
Accession Number
93A48247
Funding Number(s)
CONTRACT_GRANT: AF-AFOSR-89-0315
CONTRACT_GRANT: NGT-50952
Distribution Limits
Public
Copyright
Other

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