Card Set Information
API 12 25
Ch4 book questions
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.