NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Time-Resolved Rayleigh Scattering Measurements in Hot Gas FlowsA molecular Rayleigh scattering technique is developed to measure time-resolved gas velocity, temperature, and density in unseeded gas flows at sampling rates up to 32 kHz. A high power continuous-wave laser beam is focused at a point in an air flow field and Rayleigh scattered light is collected and fiber-optically transmitted to the spectral analysis and detection equipment. The spectrum of the light, which contains information about the temperature and velocity of the flow, is analyzed using a Fabry-Perot interferometer. Photomultipler tubes operated in the photon counting mode allow high frequency sampling of the circular interference pattern to provide time-resolved flow property measurements. Mean and rms velocity and temperature fluctuation measurements in both an electrically-heated jet facility with a 10-mm diameter nozzle and also in a hydrogen-combustor heated jet facility with a 50.8-mm diameter nozzle at NASA Glenn Research Center are presented.
Document ID
20120004217
Document Type
Conference Paper
Authors
Mielke, Amy F.
(NASA Glenn Research Center Cleveland, OH, United States)
Elam, Kristie A.
(Jacobs Sverdrup Technologies Cleveland, OH)
Sung, Chih-Jen
(Case Western Reserve Univ. Cleveland, OH, United States)
Date Acquired
August 25, 2013
Publication Date
January 7, 2008
Subject Category
Optics
Report/Patent Number
AIAA Paper 2008-262
E-18152
Meeting Information
46th AIAA Aerospace Sciences Meeting(Reno, NV)
Funding Number(s)
WBS: WBS 561581.02.08.03.18.02
Distribution Limits
Public
Copyright
Public Use Permitted.
No Preview Available