Application of Stereoscopic PIV to Measure the Flow of Air Into An Enclosure Containing a Fire.
Application of Stereoscopic PIV to Measure the Flow of
Air Into An Enclosure Containing a Fire.
(2429 K)
Bryant, R. A.
Experiments in Fluids, Vol. 47, No. 2, 295-308, August
2009.
Keywords:
enclosures; air; flow fields; velocity fields; doorways;
flow rate; lasers; heat release rate; statistics;
natural gas; mass flow; experiments; equations; fire
spread
Abstract:
Flow fields encountered in full-scale enclosure fires
are highly three-dimensional and span a large spatial
extent. Stereoscopic particle image velocimetry (SPIV)
was applied to provide a large-scale planar
interrogation of the flow of air available to a series
of fires burning inside an enclosure. Time-averaged
velocity fields across the doorway of the enclosure are
presented. These flows are bi-directional and SPIV
reveals that the time-averaged height of the region of
flow reversal depends on location within the doorway.
The volume flow rate of available air computed from the
classical one-dimensional flow approach agrees well with
the numerical integration using the velocity field
provided by SPIV. Good agreement between the measured
velocities for SPIV configurations optimized for seed
particle displacements along the laser sheet axis and
optimized for displacements perpendicular to the laser
sheet demonstrate that large-scale SPIV measurements can
be conducted with very good precision.
