Experimental study on aluminum particles combustion in a turbulent jet

In this study, experimental investigation on the aluminum particles turbulent jet flame is carried out. The fluidized aluminum particles ignite and burn in the post-flame environment supported by a premixed flat flame burner. High-speed camera and Mie scattering technique are employed to photograph the flame structure. The jet flame is divided into a preheating zone, a flame zone and a burnout zone based on the self-luminous intensity. In the upstream region of the flame, aluminum particles spread into the hot coflow and need to be heated within a certain distance to be ignited. In the flame region, typical characteristics of a single aluminum particle combustion, including condensation trail and particle rotation are observed using a high magnification zoom lens. The average image of the jet flame indicates that the condensed combustion products are mainly distributed in a thin region at the periphery of the particle clouds. Moreover, the temperature of condensed phase emitters in the flame is derived by fitting Planck's law, and the results show that increasing the oxidizing ability of the environments can significantly improve the flame temperature and reduce the lift-off height and visible length of the jet flame, but has little influence on the flame structure. (C) 2020 Elsevier Ltd. All rights reserved.

Automated summary

Experimental investigation was conducted on the aluminum particles turbulent jet flame in this study. The results showed that aluminum particles need to be heated within a certain distance to ignite, and the flame structure can be divided into preheating zone, flame zone, and burnout zone. Increasing the oxidizing ability can significantly improve the flame temperature and reduce the lift-off height and visible length of the flame.