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Time-Average Molecular Rayleigh Scattering Technique for Measurement of Velocity, Denisty, Temperature, and Turbulence Intensity in High Speed Nozzle FlowsA molecular Rayleigh scattering based flow diagnostic is developed to measure time average velocity, density, temperature, and turbulence intensity in a 25.4-mm diameter nozzle free jet facility. The spectrum of the Rayleigh scattered light is analyzed using a Fabry-Perot interferometer operated in the static imaging mode. The resulting fringe pattern containing spectral information of the scattered light is recorded using a low noise CCD camera. Nonlinear least squares analysis of the fringe pattern using a kinetic theory model of the Rayleigh scattered light provides estimates of density, velocity, temperature, and turbulence intensity of the gas flow. Resulting flow parameter estimates are presented for an axial scan of subsonic flow at Mach 0.95 for comparison with previously acquired pitot tube data, and axial scans of supersonic flow in an underexpanded screeching jet. The issues related to obtaining accurate turbulence intensity measurements using this technique are discussed.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Mielke, Amy F.
(NASA Glenn Research Center Cleveland, OH, United States)
Seasholtz, Richard G.
(NASA Glenn Research Center Cleveland, OH, United States)
Elam, Kristie A.
(Akima Corp. Fairview Park, OH, United States)
Panda, Jayanta
(OAI Brook Park, OH)
Date Acquired
August 25, 2013
Publication Date
January 5, 2004
Subject Category
Report/Patent Number
AIAA Paper 2004-706
Meeting Information
Meeting: 42nd AIAA Aerospace Sciences Meeting
Location: Reno, NV
Country: United States
Start Date: January 5, 2004
End Date: January 8, 2004
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS W8S: 22-781-30?27
Distribution Limits
Public Use Permitted.
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