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What does the term "gas generator" mean?
An engine which is operated by converting the energy of expanding gases into propulsive force
How does a turbojet produce thrust?
By greatly accelerating a small mass of air and expanding the gases leaving the exhaust nozzle.
How is a turbojet constructed?
Inlet, compressor, burner, turbine, exhaust nozzle.
What are the + - of the turbojet?
Best high speed and high altitude performance. Highest TSFC. Longest takeoff rolls.
How is a turbofan constructed?
Fan, compressor, burner, turbine, exhaust nozzle.
How does a turbofan produce thrust?
Fan pushes a large mass of air and provides 30-60% of the total thrust.
How much thrust is produced by the fan on a turbofan?
- 30-60% from the fan.
- 40-70% from the gas generator exhaust gases.
What is meant by "bypass air?"
Airflow from the fan "bypassed around the gas generator."
What are tha +- of the turbofan?
- Better TSFC than a turbojet
- shorter takeoff distance
- can lift larger weights
Large frontal area, slower, and can not fly as high as turbojet.
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