Blast Effects Flashcards
Definition of an explosion?
There are 4. I’ve picked 1,remember keywords
A nuclear chemical or physical process leading to a sudden release of energy
Three types of explosions are?
Physical (mechanical) explosion
Chemical Explosion
Nuclear explosion
Two types of physical (mechanical) explosion.
Natural
-Volcano’s
Structural
- Failure of pressurised gas Containers
Explain/define Chemical explosion
The sudden expansion of gasses into a volume much greater than the initial one, accompanied by noise and violent movement, extremely rapid reaction of a chemical system to produce heat and gas
Rapid expansion
Evolution of heat
Rapidity of reaction
Initiation of reaction
Are what category of explosion?
Chemical
Nuclear explosion definition.
Sudden release of enormous quantities of heat by fission or fusion processes.
Primary effects of an explosion.
Blast
Heat
Fragmentation
Define Blast.
Violent disruptive effect caused by an explosion, From the explosion, there is an evolution of heat and gases and a shock front that emanates from the centre of the explosion.
Phases of a blast
Shock front.
Positive pressure phase.
Negative pressure phase.
4 types of blast pressure
Dynamic Pressure
Incident Pressure
Quasi-Static
Reflected Pressure
What is blast wave reflection.
The blast wave is thrown back at an angle to the original path.
The bouncing back of a wave after it strikes a boundary
-Incident wave - the incoming wave
- reflected wave - the wave that bounces back
What is blast wave diffraction?
Breaking up or scattering of a wave by an obstacle
The basic principle of a FAE
Creating an areosole cloud of fuel air mixture.
Which is then initiated to achieve an explosive effect.
Not an incendiary effect of napalm.
Types of fuel in FAE
Aluminium
Acetylene
Butane
Kerosene
Ethylene oxide
Propylene oxide
FAE has a _____ charge to form a cloud in the air
Bursting
What secondary fuzing is used in FAEs?
Delay fusing is used to allow the cloud to expand to its optimum size prior to ignition.
How much hotter does FAE burn compared to HE
3 to 5 times hotter than HE
FAE is dependent on?
Weather conditions
Which prevents the development of optimal shape from initial burst.
FAE types of targets
Structures
Concentrations of AFV and SP guns.
Parked aircraft
Minefield clearance
Ships
Bunkers/trenches
Concentration of troops in open.
A positive phase is followed by a negative phase.
Also know as
Rarefaction
