DTIC ADA1041358: Blast Effects on Fires pdf

DTIC ADA1041358: Blast Effects on Fires

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Experiments on extinction of fires by airblast were conducted in the shocktube facility dedicated to blast/fire interaction studies. Three series of tests were conducted to gain practical understanding (quantitative and mechanistic) of blast effect on fires, using: (1) liquid-fuel fires of various sizes; (2) liquid-fuel fires, of various sizes, with flow-obstructing barriers upstream of the fuel source; and (3) wood-crib fire tests. Results affirm the concept of flame displacement as a mechanism of extinguishment for liquid-fuel fires on flat surfaces but suggest its limitation in describing blast/fire interactions when flow-perturbing obstacles are present upstream of the fuel bed. Even small barriers are seen to significantly increase the fire resistance to blowout by blast, by providing flame-retentive flow recirculation in their wake and effectively serving as flame-holders. For charring fuels such as wood cribs, after-shock flame displacement is seen to be augmented by sustained, blast-enhanced char involvement. The crib fire history before blast arrival and the extent of char-combustion enhancement (depending on blast strength) determine whether the crib fire is reestablished by rapid rekindling

• Creator/s: Defense Technical Information Center
• Date: 12/1/1980
• Year: 1980
• Book Topics/Themes: DTIC Archive, Backovsky, Jana, SRI INTERNATIONAL MENLO PARK CA, *BLAST, *EXTINCTION, *FIRES, AIR, BARRIERS, CHARRING, COMBUSTION, DISPLACEMENT, EXPLOSION EFFECTS, FLAMES, INTERACTIONS, SHOCK TUBES, TEST FACILITIES

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