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✈️ How a jet engine makes thrust

Follow air through the fan, compressor, combustor, turbine, and nozzle to see how a jet engine turns fuel energy into forward thrust.

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. Thrust begins with moving airExplain thrust as the reaction to changing air momentum and distinguish acceleration from steady cruise.An engine creates forward force by changing the motion of a mass of air; the aircraft accelerates only when thrust exceeds drag.
  2. The core is a repeating power loopTrace air through compression, combustion, turbine work, and exhaust in a continuous-flow gas turbine.The core converts fuel heat into gas expansion while a turbine recovers enough shaft power to keep the compressor and fan turning.
  3. The fan and nozzle turn energy into thrustDescribe how bypass flow, exhaust velocity, pressure, and nozzle geometry determine the final thrust-producing stream.A turbofan moves air through core and bypass paths, then the nozzle organizes the remaining energy into rearward momentum.
  4. Design choices change the answerConnect engine type and operating conditions to different compromises among mass flow, speed, efficiency, and thrust.Turbojets, turbofans, altitude, flight speed, controls, and nozzle settings change how the same energy-conversion idea performs.

Questions this course answers

What is the most direct physical origin of jet-engine thrust?

Thrust is the reaction to changing the momentum of the working fluid, mainly by accelerating air rearward.

What is the turbine's essential internal job?

The turbine takes some energy from the hot gas and sends it through shafts to the compressor and, in turbofans, the fan.

Why can a high-bypass turbofan be efficient for an airliner?

Moving more air with a smaller velocity change can reduce wasted kinetic energy in the exhaust during subsonic cruise.

Which change can alter the thrust an engine produces?

Mass flow, flight speed, pressure, temperature, throttle setting, and nozzle conditions all affect thrust.

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