Confined Blast Wave propagation

In summary, it is unlikely that the blast wave would ever outrun the detonation velocity of HMX, which is 9100 m/s. Even with different gas mixtures and pipe sizes, it is difficult to reach the high speeds of high-explosive detonation.
  • #1
Neon Cracklin
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0
I'm a little rusty on my physics, so here's the hypothetical: Put HMX prima cord in a long pipeline , say 1000m. If you detonate the prima cord and the pipe has a 3" ID, would the blast wave outrun the HMX detonation velocity of 9100 m/s. If you reduced the ID of the pipe, is there a certain point (ID) where the blast wave would move faster than the cord?
 
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  • #2
Blast wave through... natural-gas/air, or hydrogen/oxygen, or some other mixture in the pipe?

I think it's unlikely that the conflagration within the pipe would ever propagate faster than the 9.1km/s high-explosive detonation. A highly pressurized H2O2 mixture might burn at rather impressive speeds. But you'd have a hard time getting anywhere near HE detonation velocities, regardless of the pipe size. (Unless you cheat and use a gas mixture under conditions that cause it to be ignited by the prima cord inside the pipe).

From Wikipedia:
Typical detonation velocities in gases range from 1800 m/s to 3000 m/s. Typical velocities in solid explosives often range beyond 4000 m/s to 10300 m/s
 

What is a confined blast wave?

A confined blast wave is a type of shock wave that occurs when a high-pressure explosion is contained within a closed environment, such as a building or a structure. This results in a sudden and rapid release of energy, causing a rapid increase in pressure and temperature within the confined space.

What factors affect confined blast wave propagation?

There are several factors that can affect the propagation of a confined blast wave, including the type and amount of explosive material, the size and shape of the confined space, and the presence of any obstacles or barriers within the space.

How is the pressure of a confined blast wave measured?

The pressure of a confined blast wave is typically measured in terms of peak overpressure, which is the maximum pressure reached during the blast. It is usually measured in units of pounds per square inch (psi) or kilopascals (kPa).

What are the potential hazards of confined blast wave propagation?

Confined blast wave propagation can be highly destructive, with potential hazards including structural damage, injuries to people within the blast radius, and the release of toxic gases or chemicals. It can also lead to secondary hazards such as fires and collapse of nearby structures.

How can confined blast wave propagation be mitigated?

There are several measures that can be taken to mitigate the effects of confined blast wave propagation, such as using blast-resistant materials in construction, establishing safe distances from potential blast sources, and implementing emergency response plans in the event of a blast. Proper risk assessment and planning are key in mitigating the potential hazards of confined blast wave propagation.

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