Abstract
Soot characterization using multiple techniques has been performed in a series of nitrogen-diluted ethylene coflow laminar diffusion flames. Soot aggregate sizes have been measured in two dimensions, as opposed to traditional point measurements, by a newly developed two-dimensional multi-angle light scattering technique where image processing was applied to align images for Guinier analysis. Extinction measurements have also been performed using spectrally resolved line-of-sight attenuation with an imaging spectrometer. Spectrally and spatially resolved extinction measurements have been obtained as well. Combined with previously obtained time-resolved laser-induced incandescence measurements of primary particle diameters, the scattering and absorption components of extinction can be estimated. The so-called dispersion exponent that describes the wavelength dependence of spectral emissivity was determined in two dimensions and found to improve the accuracy of soot color-ratio pyrometry measurements.
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Acknowledgments
The research was supported by the DOE Office of Basic Energy Sciences (Dr. Wade Sisk, contract monitor) and NASA (Dr. Dennis Stocker, contract monitor) under contracts DE-FG02-88ER13966 and NNC04AA03A, respectively.
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Ma, B., Long, M.B. Combined soot optical characterization using 2-D multi-angle light scattering and spectrally resolved line-of-sight attenuation and its implication on soot color-ratio pyrometry. Appl. Phys. B 117, 287–303 (2014). https://doi.org/10.1007/s00340-014-5834-x
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DOI: https://doi.org/10.1007/s00340-014-5834-x