Propellants. Flashcards
What is the definition of propellants Edeop 101
An explosive, which by controlled burning, provides the gas pressure required to give motion to a projectile or missile
Two types of “states” of propellants?
Solid and liquid
Liquid has 2 types what are they?
Mono propellant
Bi propellant
Solid is dived into two types what are they?
Collodial
-Single
-Double
-Triple
Composite
Colloidal s is a system of manufacturing propellants. What are the three types of colloidal propellants
Single
Double
Triple
Advantages of double based propellants?
Easily ignited
Higher energy rating
Higher flame temperature
High burn rate
Types of additives in propellants?
8
Stabilisers
Plasticisers
Coolants
Surface moderate
Surface lubricants
Flash inhibitors
Anti wear additives
What type of additives use carbamite?
Surface moderants
Also in
Coolant, plasticisers, and stabilisers.
Present on the outer layer act similar to coolants
Two decopering agents
Lead Tin
Three ways we control propellants burn rates?
Propellant composition
Shape of propellants
Size of propellants
Three types of burn rates.
Degressive burning
Neutral burning
Progressive burning
Explain degresive burning?
The total surface area decreases as the propellants burn.
Evolution of gases is greated at first and then falls during burning.
What is neutral burning?
External surface decreases at the same rate that internal surface increases during burning
Evolution of gases constant throughout burning
Explain Progressive Burning
Total surface area increases during burning
evolution of gases increases throughout
Degressive burning shapes
Cord
flake
Strip/ribbon
Neutral burning shapes
Tubular
Cogged
Star centre
Progressive burning shapes
Rosette
Multi tubular
Propellant shapes
Cord
Tube
Multi tube
Cogged
Slotted tube
Cruciform
Drilled tube
Slotted groove tube
Strip/ribbon
4 types of moderm smokless propellants
Single Double Triple
Composite
Composition example of gun cotton
Nitrocellulose nitric acid and cotton fibre
