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In recent years, the application of biomass alternative kerosene in aero engines has aroused great public interest due to environmental concerns. On the other hand, the laminar diffusion flame is suitable to study the evolution of soot since it is convenient to collect soot particles at different development stages. In this study, the evolution of soot morphology and nanostructure in a free jet laminar diffusion flame of algae-based biofuel was compared with that of Chinese traditional RP-3 aviation kerosene. The burner was designed and manufactured in the laboratory. The differences of height, temperature, profile and other characteristics between the two flames are also concerned. A new direct sampling method was developed to collect soot samples in the flames. Compared to the traditional thermophoresis probe sampling method, it has the advantages of longer sampling time and lower-disturbing to the flame. Transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD)and elemental analyzer were applied to this investigation. Compared with the biomass soot, the RP-3 soot at the tip of the flame has longer fringe length and smaller layer spacing, which indicates a higher degree of graphitization. The information of this study will be benefit to the further application of biomass aviation alternative fuels in the aero engines.

Soot Morphological Differences between Laminar Diffusion Flames of Traditional Aviation Kerosene and Bio-kerosene