Demolition Parameters of Blast Loads

Pressure and impulse in the pressure wave determine the danger level resulting from an explosion of hydrogenous combustible mixtures. The main measurable blast wave parameters are presented in the diagram (Fig. 10.1). The blast wave pressure in a gas explosion is a function of the energy release rate and it reaches a maximum at the detonation mode of combustion [1 ]. 

Certain conditions must be met to trigger a deflagration-to-detonation transition in gaseous and heterogeneous systems containing fuel within the required concentration limits [5, 6]  

Dangerous blast waves are generated by a gas cloud combustion with a visible front velocity, at least 150-200 m/s. Unfortunately it is impossible to predict a blast velocity value in a gaseous or heterogeneous cloud (initial conditions of a particular case are known), because it is necessary to take into consideration many factors that influence cloud generation, its shape and fuel composition [2, 3, 5-7]. 

we have to define a level of anticipated danger and use maximum values assessed. Besides, assessment of potential mechanical damage relates to a space outside the cloud where thermal factors are not that significant as they are for targets inside the combustion products volume [6]. 

Fuel-air gas explosive effects (blast wave pressure and impulse) depend on the resultant energy release [7-28]. The blast wave pressure amplitude mainly relates to the energy release rate [10, 13, 24, 25]. The pressure impulse weakly depends on the 

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