Abstract: Experiments were carried out by using a self developed liquid fire spreading test stand. The whole process of surface flow movement was recorded by a schlieren system. Temperature distributions at different points of fuel and on the central line of fuel surface were measured by micro thermocouples and infrared photography. The results show that in the circumstance of synchronous ignition at both ends of aviation kerosene, the fusion process of surface flows approaching each other includes three stages: fusion, stagnation and separation, that on the liquid surface far from the flame fusion interface, the temperature rise characteristic is almost the same as that of the single-end fire, it has the characteristic of a step temperature rise, that on the liquid surface around the large eddy current, there is a second step temperature rise, and that the secondary vortex flow and premixed combustible gas can cause the fuel to burst in the later stage of fusion.

Key words: flame spread, fusion, oppositely travelling flame, surface flow, temperature profile