Generation of free concentrated fire vortices under laboratory conditions

The possibility of the principle of physical simulation of free concentrated fire vortices without using a forced twist is demonstrated. Vortex structures were generated during combustion of urotropine (hexamethylenetetramine) pellets placed on the underlying surface (aluminum sheet). The first data on the features of the occurrence of fire vortices were obtained by photographs. Estimates of some integral parameters of the generated fire vortex structures (lifetime, height, and diameter) are carried out.