Explosion Impact of Liquid Explosives in Free Space

1 Explosion Impact of Liquid Explosives in Free Space 

When the explosion of liquid explosives occurs in free space, the detonation reactions release large amount of energy in the form of pressure, and the gas products expand rapidly to the surrounding. This results in the pressure of gas products and temperature increase of local areas, which impacts the surrounding media by high temperature and high pressure in the explosion direction, presses the air and forms air shock waves. Following the further expansion of detonation products, the air shock waves increase in their layer thickness. The pressure distributions of detonation products and air shock waves are shown in Fig. 2.27. 

Pq is the air pressure without disturbance Pi is the pressure of air shock wave fronts Px is the interface pressure of detonation products and air. 

The pressure of detonation products drops rapidly in the expansion process. When P Pit 2,000 kg/cm, the detonation products of general explosives in their initial expansion follow the rule of P = Ap. The pressure changes following the cubic density. The density of detonation products reduces rapidly following the radius increase. If the packing geometry of explosives is spherical, p cx hence, 

When the radius of detonation products increases up 1 time, the pressure drops 

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