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Simply put, jet engines have a core which is split into three main sections: [Image Source: Wikimedia] Compressor â at the front of the engine are fan blades, some rotating (rotors) and some static (stators), which draw air into the engine. There are many rows of blades and as the air passes by each row it becomes more pressurised and the temperature increases.
A rocket engine uses a nozzle to accelerate hot exhaust to produce thrust as described by Newton's third law of motion. The amount of thrust produced by the engine depends on the mass flow rate through the engine, the exit velocity of the flow, and the pressure at the exit of the engine. The value of these three flow variables are all determined by the rocket nozzle design.