In situ characterisation of absorbing species in stationary premixed flat flames using UV-Vis absorption spectroscopy

被引：8
作者：
Bauer, Florian J. [1 ,2 ,3 ]
Degenkolb, Michael U. J. [1 ]
Huber, Franz J. T. [1 ,2 ,3 ]
Will, Stefan [1 ,2 ,3 ]
机构：
[1] Friedrich Alexander Univ Erlangen Nurnberg FAU, Lehrstuhl Tech Thermodynam LTT, Weichselgarten 8, D-91058 Erlangen, Germany
[2] Friedrich Alexander Univ Erlangen Nurnberg FAU, Erlangen Grad Sch Adv Opt Technol SAOT, Paul Gordan Str 6, D-91052 Erlangen, Germany
[3] Friedrich Alexander Univ Erlangen Nurnberg FAU, Cluster Excellence Engn Adv Mat EAM, Nagelsbachstr 49b, D-91052 Erlangen, Germany
来源：
APPLIED PHYSICS B-LASERS AND OPTICS | 2021年 / 127卷 / 08期
关键词：
POLYCYCLIC AROMATIC-HYDROCARBONS; SOOT PARTICLES; LIGHT-SCATTERING; CROSS-SECTIONS; ORGANIC-CARBON; SPECTRA; NANOPARTICLES; EXTINCTION; SIZE; PRECURSORS;
D O I：
10.1007/s00340-021-07664-z
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A one-dimensional premixed ethylene-air flame is investigated regarding the presence of various combustion intermediates and products relevant for the formation of carbonaceous particles for various equivalence ratios and spatial positions using in situ UV-Vis absorption spectroscopy. A laser driven light source in combination with a fast spectrometer allow to record absorption spectra at a high rate required for practical combustion devices. The approach is coupled with a least squares regression procedure using a database of several absorbing species in the flame. To account for the high temperature flame conditions, the absorption spectra are convoluted by a simplified Maxwell-Boltzmann distribution model. While the approach is based on several assumptions and a verification requires future detailed intercomparison with other techniques, a first semi-quantitative evaluation can be obtained. This novel approach opens a potential route to the in situ measurement of the evolution of polycyclic aromatic hydrocarbons (PAHs) in flames.
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页数：15
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