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Experiments on a separation bubble over an Eppler 387 airfoil at low Reynolds numbers using thin-film arraysExperiments carried out at the NASA Langley Low-Turbulence Pressure Tunnel on an Eppler 387 airfoil at several angles of attack for Reynolds numbers of 100,000 to 300,000 are discussed. Cross-correlations and phase diagrams are used in calculating velocities, while spectra are used in checking for amplified frequencies, and coherence plots for causality. Hot-film measurements, oil-flow visualization, pressure measurements, and Drela code are compared for finding the leading and trailing edges of the bubble. It is observed that all methods agree in showing the beginning and end of the separation bubble, the velocity measurements agree in magnitude for the lower velocities, and wave packets appear in the cross-correlation.
Document ID
19910046709
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mousseux, Marc C.
(Arizona State University Tempe, United States)
Chokani, Ndaona
(North Carolina State University Raleigh, United States)
Stack, John P.
(Arizona State Univ. Tempe, AZ, United States)
Mcghee, Robert J.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Subject Category
Aerodynamics
Meeting Information
Meeting: Instability and Transition
Location: Hampton, VA
Country: United States
Start Date: May 15, 1989
End Date: June 9, 1989
Sponsors: ICAS, NASA
Accession Number
91A31332
Funding Number(s)
CONTRACT_GRANT: NAS1-18605
CONTRACT_GRANT: NAS1-18599
Distribution Limits
Public
Copyright
Other

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