NDLI: Time-resolved rayleigh scattering measurements in hot gas flows

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Time-resolved rayleigh scattering measurements in hot gas flows

Content Provider	NASA Technical Reports Server (NTRS)
Author	Elam, Kristie A. Mielke, Amy F. Sung, Chih-Jen
Copyright Year	2008
Description	A 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.
File Size	15994411
Page Count	19
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20120004217
Archival Resource Key	ark:/13960/t9v17143p
Language	English
Publisher Date	2008-01-07
Access Restriction	Open
Subject Keyword	Optics Gas Jets Rayleigh Scattering Flow Measurement High Temperature Gases High Frequencies Gas Temperature Fiber Optics Gas Flow Spectrum Analysis Sampling Velocity Measurement Fabry-perot Interferometers Counting Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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