5 kHz thermometry in a swirl-stabilized gas turbine model combustor using chirped probe pulse femtosecond CARS. Part 1: Temporally resolved swirl-flame thermometry
KAUST Grant Number1975-01
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AbstractSingle-laser-shot temperature measurements at 5 kHz were performed in a gas turbine model combustor using femtosecond (fs) coherent anti-Stokes Raman scattering (CARS). The combustor was operated at two conditions; one exhibiting a low level of thermoacoustic instability and the other a high level of instability. Measurements were performed at 73 locations within each flame in order to resolve the spatial flame structure and compare to previously published studies. The measurement procedures, including the procedure for calibrating the laser system parameters, are discussed in detail. Despite the high turbulence levels in the combustor, signals were obtained on virtually every laser shot, and these signals were strong enough for spectral fitting analysis for determination of flames temperatures. The spatial resolution of the single-laser shot temperature measurements was approximately 600 µm, the precision was approximately ±2%, and the estimated accuracy was approximately ±3%. The dynamic range was sufficient for temperature measurements ranging from 300 K to 2200 K, although some detector saturation was observed for low temperature spectra. These results demonstrate the usefulness of fs-CARS for the investigation of highly turbulent combustion phenomena. In a companion paper, the time-resolved fs CARS data are analyzed to provide insight into the temporal dynamics of the gas turbine model combustor flow field.
CitationDennis CN, Slabaugh CD, Boxx IG, Meier W, Lucht RP (2016) 5 kHz thermometry in a swirl-stabilized gas turbine model combustor using chirped probe pulse femtosecond CARS. Part 1: Temporally resolved swirl-flame thermometry. Combustion and Flame 173: 441–453. Available: http://dx.doi.org/10.1016/j.combustflame.2016.02.033.
SponsorsFunding for this work was provided by the U.S. Department of Energy, Division of Chemical Sciences, Geosciences and Biosciences under Grant No. DE-FG02-03ER15391 and by the King Abdullah University of Science and Technology under CCF sub-award No. 1975-01. The ultrafast laser system was purchased with funding from AFOSR DURIP Grant No. FA9550-09-1-0387. Support for manuscript preparation was provided by Office of Naval Research NSTAR under ID No. ILIR-4767.
JournalCombustion and Flame