Abstract
Low-temperature flames established on a flat-flame burner are investigated using rich diethyl ether/air mixtures to acquire a new knowledge of self-ignition processes. Temperature, chemical species and emission spectra are measured along with the burner axis. A series of cool flame, blue flame and a bright yellow column appears in a case of equivalence ratio 2.0. A dark zone demarcates between the blue flame and yellow column. Fuel enrichment causes a yellow column disappearance. Onset temperatures of cool and blue flame are 400 and 850 K respectively, which are independent to the equivalence ratios. Blue flame emission spectra contain an emission ranging from 720 to 810 nm in wave length, which can be estimated to be the H2O spectrum. Yellow column spectra are similar to that of black bodies; the emission probably from solid carbon particles therewith. The dark zone has similar near-infrared emission spectra and intensity to the blue flame though the visible emission is quite weak. The appearance of blue flame is closely related to an intensive decomposition of fuel, i.e., only when the decomposition reactions complete in the blue flame, the low-temperature oxidation process is raised to the final hot-flame stage.
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