Passive optical probes and high-resolution emission spectroscopy are used to provide a general-purpose real-time temperature and chemical species sensing capability. Probes can be inserted in the combustor, at the turbine inlet, in the augmenter, or at the engine exit with application as an engine development diagnostic tool that provides spatially resolved measurements of the key combustion parameters: temperature, CO concentration, and H2O concentration. Multiple probes are arrayed to collect the emitted infrared radiation over different views of the hot gas path. Line-of-sight averaged concentrations and temperatures are determined by spectral analysis of the emitted radiation along each line of sight (LOS). Spatial profiles may also be determined by simultaneous analysis of overlapping lines of sight. The collected infrared spectra contain optically thin and optically thick features that reflect the effects of emission and absorption within the combustion region. The known spectral structure of the component spectra can be used for the automated interpretation of the observed radiance spectra in terms of concentrations and temperatures along the line of sight, and in specific volume elements of overlapping lines of sight. In this work, we present measurements of atmospheric-pressure flames and high-pressure combustors and describe the formalism for fitting the observed spectra to a basis of simulated spectra to extract estimates of concentrations and temperatures. The spectral basis is constructed using a multilayer radiation transport model, in which each line-of-sight or measurement volume is divided into segments of uniform concentration and temperature. The observed radiance emanating from each segment is calculated as a function of the local physical variables. The collection of observed data, which contains a highly structured emission spectrum over each line of sight, is fit to the spectral basis to extract line-of-sight averaged physical properties, or in the case of spatial reconstruction, volume-averaged properties for each of the overlap regions.
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ASME Turbo Expo 2006: Power for Land, Sea, and Air
May 8–11, 2006
Barcelona, Spain
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
0-7918-4237-1
PROCEEDINGS PAPER
IR Structured Emission-Based Speciation, Thermometry, and Tomography of CO and H2O in High-Pressure Combustors Available to Purchase
Neil Goldstein,
Neil Goldstein
Spectral Sciences Inc., Burlington, MI
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Brian Gregor,
Brian Gregor
Spectral Sciences Inc., Burlington, MI
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Jamine Lee,
Jamine Lee
Spectral Sciences Inc., Burlington, MI
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Stephen K. Kramer,
Stephen K. Kramer
Pratt & Whitney, East Hartford, CT
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Stuart Kozola,
Stuart Kozola
Pratt & Whitney, East Hartford, CT
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Kenneth J. Semega
Kenneth J. Semega
Air Force Research Laboratories
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Neil Goldstein
Spectral Sciences Inc., Burlington, MI
Brian Gregor
Spectral Sciences Inc., Burlington, MI
Jamine Lee
Spectral Sciences Inc., Burlington, MI
Stephen K. Kramer
Pratt & Whitney, East Hartford, CT
Stuart Kozola
Pratt & Whitney, East Hartford, CT
Kenneth J. Semega
Air Force Research Laboratories
Paper No:
GT2006-90899, pp. 767-776; 10 pages
Published Online:
September 19, 2008
Citation
Goldstein, N, Gregor, B, Lee, J, Kramer, SK, Kozola, S, & Semega, KJ. "IR Structured Emission-Based Speciation, Thermometry, and Tomography of CO and H2O in High-Pressure Combustors." Proceedings of the ASME Turbo Expo 2006: Power for Land, Sea, and Air. Volume 2: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Controls, Diagnostics and Instrumentation; Environmental and Regulatory Affairs. Barcelona, Spain. May 8–11, 2006. pp. 767-776. ASME. https://doi.org/10.1115/GT2006-90899
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