Experimental study of polycyclic aromatic hydrocarbons (PAHs) in n-Heptane laminar diffusion flames from1.0 to 3.0 bar

Lei Zhou, G. Xiong, M. Zhang, L. Chen, D. Shirun, L.P.H. de Goey

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Abstract

As PAHs (Polycyclic Aromatic Hydrocarbons) are the main precursor of soot formation during the combustion, the investigation of PAHs formation is essential for the understanding of the soot formation and soot reduction in combustion. In this study, a specially designed burner and the corresponding fueling system was used to stabilize a laminar diffusion flame of n-heptane up to 3.0 bar before it becomes unstable. Using the combination of LII (Laser Induced Incandescence) and LIF (Laser Induced Fluorescence) techniques, the PAHs and soot formation and their distributions in the studied flames were obtained and explained. The results showed that PAHs were almost surrounded by soot and were present in the lower part of the flame. Moreover, the integral soot and PAH intensities exhibited a power law dependence on the pressure, being proportional to pn with n of 1.38 ± 0.32 and 1.49 ± 0.25 respectively under the pressure range of 1.0–3.0 bar.
Original languageEnglish
Pages (from-to)265-273
Number of pages9
JournalFuel
Volume209
DOIs
Publication statusPublished - 1 Dec 2017

Keywords

  • Elevated pressure
  • LIF
  • LII
  • Laminar diffusion flames
  • PAHs
  • Soot
  • n-heptane

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