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Laser holographic interferometric measurements of the flow behind a rearward facing stepA holographic interferometer has been designed, constructed, and evaluated in an experimental study of the supersonic flow over a rearward facing step. The nominal Mach number at the corner was 2.05 +/- 0.04 and the Reynolds number per inch was 11.9 x 10 exp 6. The holographic interferometric measurements were supplemented by classical measurements of surface pressure, oil flow, and schlieren visualization. The effects of step height and step width were examined. A method to determine the reattachment point from the interferograms was examined and found to be in good agreement with the other measurement techniques. The reattachment point moved closer to the step as the step height was decreased, but its location did not change with varying step width. In addition to providing surface data for the flow over a rearward facing step, this study provides quantitative off-surface density data and Mach number data throughout the flow, obtained from the holographic interferometry measurements, which are suited for code validation.
Document ID
19930063282
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Leonard, Rachel
(NASA Headquarters Washington, DC United States)
Chokani, Ndaona
(North Carolina State Univ. Raleigh, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: In: AIAA Applied Aerodynamics Conference, 11th, Monterey, CA, Aug. 9-11, 1993, Technical Papers. Pt. 2 (A93-47201 19-02)
Publisher: American Institute of Aeronautics and Astronautics
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 93-3515
Accession Number
93A47279
Funding Number(s)
CONTRACT_GRANT: NAGW-1331
Distribution Limits
Public
Copyright
Other

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