3. Blast wave following deflagration in free space
3.1 Piston model
In the ideal case, a flame propagating in a combustible gas mixture towards the fresh gases is characterized by a smooth front and a velocity known as the fundamental laminar flame velocity, S L (m.s -1 ).
In the case of a spherically propagating flame in the absence of confinement, the fundamental velocity S L is different from the space velocity due to the change in thermodynamic conditions on either side of the flame front. The release of heat due to the chemical reaction implies an increase in temperature, and therefore in molar volume. As a result, the observed flame front propagation velocity V...
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Blast wave following deflagration in free space
Blast wave following deflagration in an obstructed space
Bibliography
Standards and norms
- Recommended practice for the classification of flammable liquids, gases, or vapors and of hazardous (classified) locations for electrical installations in chemical process areas. - NFPA 497 - 2008
- Site classification – Explosive gas atmospheres. - NF EN 60079-10-1 - Mai 2016
Regulations
Order of September 29 relating to the assessment and consideration of the probability of occurrence, kinetics, intensity of effects and severity of consequences of potential accidents in hazard studies for classified facilities subject to authorization.
Decree no. 2014-284 of March 3, 2014 amending Title I er of Book V of the Environmental Code....
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