Behavior Of The Reverse Flow In Front Of The Leading Flame Edge Spreading Over Fuel-soaked Sand In An Air Stream

Abstract

The behavior of the reverse flow in f r o nt. of t.h e leading flame edge spreading over kerosene-soaked sand in an a i r s t.r e a:n has been examined using a few flow visualization techniques, and r.h e role of t.h e reverse flow in the flame spread is discussed.In a wide range of the free stream velocities U from 30 t.o 210 cm/s, a stable reverse flow region in f r o nt. of the leading flame edge was observed clearly, and its horizontal dimension was found to be almost independent of U.As U increases, the velocity of the reverse flow increases. The reverse flow takes an important role in the stable flame spread in an opposed air stream, although it has no apprec iable e f f e ct. on the f lame spread rate.The reverse f low provides a slow gas stream region, through which gasified fuel as well as heat from the reacteion zone would be transferred in the upstream direction.

Flame Spread in Opposed Flow along the Ground Soaked with High-volatile Liquid Fuel

“…Suzuki and Hirano have revealed some interesting and important aspects of flame spread in the surrounding airflow on liquid pool [10] and on the ground soaked with low-volatile liquid fuel [16,17]. The present study aims to clarify experimentally the effect of opposed flow velocity on the flame spread aspect along the high-temperature ground soaked with high-volatile (low flash point) liquid fuel.…”

“…On the ground of which the temperature is under the stoichiometric temperature of the spilled liquid fuel, however, the flame spread is relatively slow [13][14][15][16][17][18][19].…”

Experimental Study of Temperature Distribution and Flame Spread Over an Inert Porous Bed Wetted with Liquid Fuel

“…Figures 8 to 10 evidently show that apart from the effects of airflow on the rate of flame spread when a finite quantity of liquid fuel is available the rate of flame spread along the surface of an inert porous bed decreases as either the particle sizes or the bed depth are increased. This is an obvious distinction with flame spread over beds which have completely saturated with fuel [12][13][14].…”

Modeling Subsurface Multiphase Transport of JP8 During a Fuel Spill Fire

“…Some of the work that has been done, (Takeno & Hirano, 1986, 1998) is for bead packs; these porous materials exhibit a different scale for capillary potential than would typical soils. Suzuki et al (1991) performed an experiment in sand, but the emphasis was on the effect on the flame over the porous surface and no information about the nature of the interaction with the subsurface was provided.…”