Abstract-
Two aspects of fires make it unique from turbulent reacting flow in engineered
systems. One is radiation from soot, the other is buoyant turbulence. This
talk will focus on the latter. Fires are mixing-limited combustion phenomena
and large coherent structures play a significant role in fires. This talk will
discuss the nature of buoyant turbulence with respect to a simple helium plume,
a methane fire, and finally a large hydrocarbon fire. Fire interactions with
cross-winds have similarities to, and differences from, jets in cross flow.
Examples of upwind rollers and downwind columnar vortices will be shown for a
large fire. Time and length scales in fires and implications on numerical
simulations will be discussed.
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