Fluid Dynamics of Fire Whirls: An Inviscid Model

摘要

Whirling fire plumes are known to increase the danger of naturally occurring orpost-disaster fires. In order for a fire whirl to exist, there must be an organized source of angular momentum to produce the large swirl velocities as air is entrained into the fire plume. These vorticity-driven fires occur over a large range of length and velocity scales, and significantly alter the entrainment and combustion dynamics. A new model that incorporates angular rotation and neglects dissipation is derived for a buoyant plume; the result is a form of the steady state Euler equations. Included is a general solution for large desnity and temperature variations. Results that identify the mechanisms and their effects on the creation of a fire whirl are presented.