2c – Thrust

Thrust is the force produced by the engine. It is directed forward along the axis of the engine. This is the explanation for a jet engine (not a propeller).

Thrust increases with:

  • increasing velocity of the exhaust gasses: it means the more gasses that goes out for the engine the faster
  • increasing mass flow: the more air goes throught the engine the faster

A large mass of air is sucked in the engine at the front, squeezed in, compressed to a very high temperature and expelled at a much higher speed.

THRUST = (MASS FLOW RATE) x (CHANGE IN VELOCITY)

Question: Why the released air is faster? Because its temperature is faster at the exit.

Exemple of this: a pressure cooker.

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