Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 19, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/19/1/015406
Keywords
combustion diagnostics; laser diagnostics; Raman spectroscopy; thermometry; multiscalar measurements; fuel-air mixing
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An alternative optical thermometry technique that utilizes the low-resolution (order 10(1) cm(-1)) pure-rotational spontaneous Raman scattering of air is developed to aid single-shot multiscalar measurements in turbulent combustion studies. Temperature measurements are realized by correlating the measured envelope bandwidth of the pure-rotational manifold of the N-2/O-2 spectrum with a theoretical prediction of a species-weighted bandwidth. By coupling this thermometry technique with conventional vibrational Raman scattering for species determination, we demonstrate quantitative spatially resolved, single-shot measurements of the temperature and fuel/oxidizer concentrations in a high-pressure turbulent CH4-air flame. Our technique provides not only an effective means of validating other temperature measurement methods, but also serves as a secondary thermometry technique in cases where the anti-Stokes vibrational N-2 Raman signals are too low for a conventional vibrational temperature analysis.
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