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Planar Rayleigh scattering and laser-induced fluorescence for visualization of a hot, Mach 2 annular air jetPlanar Rayleigh scattering (PRS) and planar laser-induced fluorescence (PLIF) were used to investigate the vitiated air component of a coaxial hydrogen/vitiated air nonpremixed turbulent jet flame that is ejected at a Mach number of 2. All experiments were performed with a xenon chloride tunable excimer laser. Planar information for both techniques was obtained using laser sheets 6 cm high, 5 cm wide, and 300 micron thick. In this flow field, the effective Rayleigh cross section of the components in the vitiated air was assumed to be independent of composition. Therefore, the PRS technique produced signals which were proportional to total density. When the flow field was assumed to be at a known and uniform pressure, the PRS signal data for the vitiated air could be converted to temperature information. Also, PLIF images were generated by probing the OH molecule. These images contain striation patterns attributed to small localized instantaneous temperature nonuniformities. The results from the PLIF and PRS techniques were used to show that this flow field contains a nongaseous component, most likely liquid water that can be reduced by increasing the settling chamber wall temperature.
Document ID
19950006783
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Balla, R. Jeffrey (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1994
Subject Category
Astronautics (General)
Report/Patent Number
L-17374
NAS 1.15:4576
NASA-TM-4576
Accession Number
95N13196
Funding Number(s)
PROJECT: RTOP 505-70-91-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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