Abstract
Formaldehyde (HCHO) is an important intermediate species in the oxidation of fuel, whose concentrations contribute to the construction of the detailed chemical kinetic model of fuel oxidation. In this study, HCHO in a dimethyl ether (DME)-premixed flame under atmospheric pressure was quantified using 2f-wavelength modulation spectroscopy (2fWMS) and a mid-infrared interband cascade laser (mid-IR ICL). 2f-WMS spectrum of HCHO in the DME-premixed flame was obtained and HCHO concentration was measured in terms of the peak intensity of the 2f-WMS spectrum. The concentration distribution of HCHO in the DME-premixed flame was also obtained using the HCHO concentration measured by the mid-IR ICL and an Abel conversion.
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