Development of Imaging Fourier-Transform Spectroscopy for the Characterization of Turbulent Jet Flames
AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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Recent advances in computational models to simulate turbulent, reactive flow fields have outpaced the ability to collect highly constraining data--throughout the entire flow field--for validating and improving such models. In particular, the ability to quantify in three dimensions both the mean scalar fields i.e. temperature species concentrations and their respective fluctuation statistics via hyperspectral imaging would be a game-changing advancement in combustion diagnostics, with high impact in both validation and improvement efforts for computational combustion models. This research effort establishes imaging Fourier-transform spectrometry IFTS as a valuable tool which complements laser diagnostics for the study of turbulent combustion. Specifically, this effort 1 demonstrates that IFTS can be used to quantitatively measure spatially resolved spectra from a canonical turbulent flame 2 establishes the utility of quantile spectra in first-ever quantitative comparisons between measured and modeled turbulent radiation interaction TRI 3 develops a simple onion-peeling-like spectral inversion methodology suitable for estimating radial scalar distributions in axisymmetric, optically-thick flames 4 builds understanding of quantile spectra and demonstrates proof of concept for their use in estimating scalar fluctuation statistics.
- Atomic and Molecular Physics and Spectroscopy
- Combustion and Ignition