Abstract
A premixed laminar acetylene/oxygen/argon flame with an equivalence ratio of 2.25 was investigated at low pressure (3.3kPa). The flame structure was measured using molecular-beam mass spectrometry (MBMS) and tunable synchrotron vacuum ultraviolet (VUV) photoionization. Combustion intermediates from m/z=15–146, including many radicals and isomeric species, were identified from the ionization threshold measurements of photoionization efficiency spectra; and their mole fraction profiles were evaluated from the measurements of burner scan at the photon energies near ionization thresholds. Besides, the flame temperature profile was recorded by a Pt/Pt–13%Rh thermocouple. In particular, polyynes (C2nH2, n⩾2) up to C12H2 were observed in this flame and attracted special concerns. Due to the analogous structural features of polyynes and exponential concentration decay with the increasing molecular weight, these intermediates are concluded to be formed from smaller ones via similar formation channels, which can verify the suggestion of previous investigations. Furthermore, another polyynic family with formula of CnH4 (4⩽n⩽10) was detected in this flame. Possible formation channels are discussed for the newly observed polyynic CnH4 intermediates in acetylene flames.
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