Abstract: Research on the influence of microgravity environment on the morphological characteristics of laminar jet diffusion flames, can provide theoretical support for fire detection in aerospace research. Firstly, the controllable laminar jet diffusion flames were selected to analyze the characteristics of flame soot and the influence of flame soot on the flame temperature and thermal radiation. Secondly, the microgravity experiment was conducted in the drop tower facility of the National Microgravity Laboratory of China to obtain microgravity level of 10-2 ~10-3 g. The experimental results showed that flame brightness increased with coflow velocity increasing, the flame radiation fraction decreased with coflow velocity increasing, and as the flame temperature increased, the high temperature zone in the flame was located on the two wings of the flame.

Key words: microgravity, jet flame, laminar diffusion flame, flame morphology