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Mixture-Fraction Measurements with Femtosecond-Laser Electronic-Excitation TaggingTracer-free mixture-fraction measurements were demonstrated in a jet using femtosecond-laser electronic-excitation tagging. Measurements were conducted across a turbulent jet at several downstream locations both in a pure-nitrogen jet exiting into an air-nitrogen mixture and in a jet containing an air-nitrogen mixture exiting into pure nitrogen. The signal was calibrated with known concentrations of oxygen in nitrogen. The spatial resolution of the measurement was approx.180 microns. The measurement uncertainty ranged from 5% to 15%, depending on the mixture fraction and location within the beam, under constant temperature and pressure conditions. The measurements agree with a mixture fraction of unity within the potential core of the jet and transition to the self-similar region.
Document ID
20170007729
Acquisition Source
Langley Research Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Halls, Benjamin R.
(Air Force Research Lab. Wright-Patterson AFB, OH, United States)
Jiang, Naibo
(Spectral Energies, LLC Dayton, OH, United States)
Gord, James R.
(Air Force Research Lab. Wright-Patterson AFB, OH, United States)
Danehy, Paul M.
(NASA Langley Research Center Hampton, VA, United States)
Roy, Sukesh
(Spectral Energies, LLC Dayton, OH, United States)
Date Acquired
August 15, 2017
Publication Date
March 17, 2017
Publication Information
Publication: Applied Optics
Volume: 56
Issue: 11
ISSN: 1559-128X
e-ISSN: 2155-3165
Subject Category
Instrumentation And Photography
Optics
Report/Patent Number
NF1676L-24271
Funding Number(s)
WBS: WBS 295670.01.07
Distribution Limits
Public
Copyright
Other

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