CAPTURING THE PULSATION FREQUENCY OF A BUOYANT POOL FIRE USING THE LARGE EDDY SIMULATION APPROACH

摘要

Pool fires are typically characterised by a very low initial momentum and are strongly affected by buoyancy effects. The fire is sustained through the supply of sufficient oxidants for combustion by the stagnant air entraining into the flame. Meanwhile, large toroidal vortex structures, which re-circulate at the vicinity of the flame, are also generated. The occurrence of this oscillating phenomenon also known as the puffing effect stems from the presence of coherent structures above a fire plume, which in turn leads to vortex shedding especially through the formation of large flaming vortices that rise up until they burn out at the top of the flame.