5 kHz thermometry in a swirl-stabilized gas turbine model combustor using chirped probe pulse femtosecond CARS. Part 1: Temporally resolved swirl-flame thermometry
| Autor: | Isaac Boxx, Robert P. Lucht, Carson D. Slabaugh, Wolfgang Meier, Claresta N. Dennis |
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| Jazyk: | němčina |
| Rok vydání: | 2016 |
| Předmět: |
gas turbine
fs CARS General Chemical Engineering Flame structure General Physics and Astronomy Energy Engineering and Power Technology 01 natural sciences Temperature measurement 010305 fluids & plasmas law.invention 010309 optics swirl flame symbols.namesake high repetition rate Optics law 0103 physical sciences Verbrennungsdiagnostik Chemistry business.industry Turbulence Dynamic range General Chemistry Laser Fuel Technology Femtosecond symbols Combustor business Raman scattering |
| Popis: | 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. 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. |
| Databáze: | OpenAIRE |
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