Deflagration combustion

TABLE 4.2. Overview of Test Results on Deflagrative Combustion of Fuel-Air Clouds under Uncontrolled Conditions... 

Conclusions from experiments on deflagrative combustion of fuel-air clouds under uncontrolled conditions follow ... 

Deflagrative combustion of an extended, flat vapor cloud is very ineffective in producing damaging blast waves because combustion products have a high rate of side relief accompanied by vortex formation. 

A much more pronounced vortex formation in expanding combustion products was found by Rosenblatt and Hassig (1986), who employed the DICE code to simulate deflagrative combustion of a large, cylindrical, natural gas-air cloud. DICE is a Eulerian code which solves the dynamic equations of motion using an implicit difference scheme. Its principles are analogous to the ICE code described by Harlow and Amsden (1971). 

Experimental research during the last decade (Section 4.1) has shown clearly that deflagrative combustion generates blast only in those portions of a quiescent vapor cloud which are sufficiently obstructured and/or partially confined (Zeeuwen et al. 1983 Harrison and Eyre 1987 Harris and Wickens 1989 Van Wingerden 1989a). 

Assume that blast modeling on the basis of deflagrative combustion is a sufficiently safe and conservative approach. (The basis for this assumption is that an unconiined vapor cloud detonation is extremely unlikely only a single event has been observed.)... 

Gorev, V. A., and Bystrov S. A. 1985. Explosion waves generated by deflagration combustion. Comb., Explosion and Shock Waves. 20 (6) 614-620. 

HMX and RDX are heated, deflagration combustion occurs with a burning rate of about 1 mm s" at 1 MPa. However, when these nitramines are ignited by primers giving rise to shock waves, detonation combustion occurs with a burning rate of more than 7000 m s . The characteristics of combustion wave propagation are determined by the Chapman-Jouguet relationship described in Refs. [1-5]. 

DETONATION (EXPLOSION, DEFLAGRATION, COMBUSTION AND FORMATION), HEATS OF... 

The heat of explosion can be calculated or determined experimentally in special thick-walled bombs, as described under DETONATION (EXPLOSION, DEFLAGRATION, COMBUSTION AND FORMATION), HEATS OF... 

MORRISON, ADAMSON, AND WEIR—DETONATIVE AND DEFLAGRATIVE COMBUSTION... 

Chippett S (1984) Modeling of vented deflagrations. Combust Flame 55 127-140 Bjerketvedt D, Bakke JR, van Wingerden K (1992) Gas explosion handbook, GexCon... 

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