Abstract
Laser filamentation produced by the propagation of intense laser pulses in flames is opening up new possibility in application to combustion diagnostics that can provide useful information on understanding combustion processes, enhancing combustion efficiency and reducing pollutant products. Here we present simultaneous identification of multiple combustion intermediates by femtosecond filament excitation for five alkanol-air flames fueled by methanol, ethanol, n-propanol, n-butanol, and n-pentanol. We experimentally demonstrate that the intensities of filament-induced photoemission signals from the combustion intermediates C, C2, CH, CN increase with the increasing number of carbons in the fuel molecules, and the signal ratios between the intermediates (CH/C, CH/C2, CN/C, CH/C2, CN/CH) are different for different alkanol combustion flames. Our observation provides a way for sensing multiple combustion components by femtosecond filament excitation in various combustion conditions that strongly depend on the fuel species.
Highlights
We experimentally demonstrate that the intensities of filament-induced photoemission signals from the combustion intermediates C, C2, CH, CN increase with the increasing number of carbons in the fuel molecules, and the signal ratios between the intermediates (CH/C, CH/C2, CN/C, CH/C2, CN/CH) are different for different alkanol combustion flames
By comparing filament-induced nonlinear spectroscopy (FINS) spectrum with those obtained from ns-LIBS and the combustion emission itself in the ethanol-air flame, it was demonstrated that the fingerprint fluorescence produced in a flame filament mainly come from the excitation of intermediate species existing in the combustion flame, but not from the fragments generated by the dissociation of parent molecules by the intense femtosecond laser field[15]
Our results demonstrate that the FINS technique can be used for sensing combustion intermediates of different combustion conditions, which is of significance for rationalizing the combustion reaction dynamics, and shed more light on the understanding of the multi-component combustion diagnostics
Summary
We present simultaneous identification of multiple combustion intermediates by femtosecond filament excitation for five alkanol-air flames fueled by methanol, ethanol, n-propanol, n-butanol, and n-pentanol.
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