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5 kHz thermometry in a swirl-stabilized gas turbine model combustor using chirped probe pulse femtosecond CARS. Part 1: Temporally resolved swirl-flame thermometry

Journal Article · · Combustion and Flame
 [1];  [2];  [3];  [3];  [2]
  1. Purdue University, West Lafayette, IN (United States); DOE/OSTI
  2. Purdue University, West Lafayette, IN (United States)
  3. German Aerospace Center (DLR), Stuttgart (Germany)
Single-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. Here 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.
Research Organization:
Purdue University, West Lafayette, IN (United States)
Sponsoring Organization:
Air Force Office of Scientific Research (AFOSR); King Abdullah University of Science and Technology; Office of Naval Research (ONR); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
Grant/Contract Number:
FG02-03ER15391
OSTI ID:
1533658
Alternate ID(s):
OSTI ID: 1396651
Journal Information:
Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: C Vol. 173; ISSN 0010-2180
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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