5-4 Turbojet and Turbofan Engines SQ

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  1. What does the term “gas generator” mean?
    An engine which is operated by converting the energy of expanding gases into propulsive force.
  2. How is a turbojet constructed?
    • Inlet
    • compressor
    • burner
    • turbine
    • exhaust nozzle.
  3. How does a turbojet produce thrust?
    By greatly accelerating a small mass of air and expanding the gases leaving the exhaust nozzle.
  4. What are the advantages and disadvantages of the turbojet?
    • Advantage
    • Best high speed and high altitude performance.

    • Disadvantages
    • Highest TSFC. Longest takeoff rolls.
  5. How is a turbofan constructed?
    • Fan
    • compressor
    • burner
    • turbine
    • exhaust nozzle.
  6. How does a turbofan produce thrust?
    • Fan pushes a large mass of air and provides 30-60% of the total thrust.
    • Exhaust produces 70-40% of the total thrust.
  7. How much thrust is produced by the fan on a turbofan? Gas Generator?
    • 30-60% from the fan.
    • 40-70% from the gas generator exhaust gases.
  8. What is meant by "bypass air?"
    Airflow from the fan "bypassed around the gas generator."
  9. What are the advantages and disadvantages of the turbofan?
    • Advantage
    • Better TSFC than a turbojet, shorter take off distance, can lift larger weights.

    • Disadvantage
    • Large frontal area, slower, and can not fly as high as turbojet.

Card Set Information

Author:
dundane
ID:
320974
Filename:
5-4 Turbojet and Turbofan Engines SQ
Updated:
2016-06-16 14:45:18
Tags:
Engines
Folders:
API,Engines,Study Questions
Description:
Study Questions
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