Numerical description of axisymmetric blue whirls over liquid-fuel pools

This numerical investigation is focused on determining the structures of blue whirls, recently found to occur in laboratory investigations fire whirls when circulation becomes sufficiently large produce a vortex breakdown that drastically shortens whirl and correspondingly reduces residence times, so yellow flames turn blue. The computations address axisymmetric configurations for round pools liquid fuels flush with at center larger solid horizontal disc, outer edge which vanes adjustable angles cause entrained air enter controllable azimuthal component velocity. nondimensionlized conservation equations employed include realistic Lewis numbers temperature-dependent transport coefficients one-step chemical-kinetic approximation correctly reproduces laminar burning velocities. Buoyancy radiant energy from surface are both taken into account, latter being be essential whirl. Along vaporization-equilibrium energy-conservation boundary conditions fuel surface, inflow provided by developed solution boundary-layer flow over while zero-gradient outflow applied above Controlling nondimensional parameters, besides Reynolds, Damköhler, Froude numbers, ratio convective flux inward radial velocity layer disc. computed onset whirl, as well structure itself, bear close resemblance what was experimentally.