S.1 Spacecraft Propulsion Systems Chapter 1: Introduction to ...

Rocket propulsion device basic parts
A rocket propulsion device has 3 basic parts:
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Thrust (combustion) Chamber, where the propellant burns, producing hot gas
Converging section (throat), to constrict the flow of hot gases, thus controlling chamber
pressure and mass flow rate
Nozzle, to accelerate the gas flow to high velocity in the desired direction
The schematic of a rocket engine is presented below, showing the main rocket thrust chamber
performance parameters.