Engines Ch5

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Author:
beardpapa
ID:
149725
Filename:
Engines Ch5
Updated:
2012-04-23 23:42:20
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API 12 25
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Book Questions Chapter 5
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  1. Describe the basic construction of a turboprop engine.
    Gas generator with a reduction gearbox, torquemeter assembly, and a properller assembly.
  2. What component produces the majority of thrust in a turboprop?
    Prop (90% of total thrust)
  3. Why are reduction gears required in a turboprop?
    To keep the blade tips subsonic. COnverts high RPM / low torque to low RPM/high torque.
  4. How much trust is produced from the exhaust gases of a turboprop?
    10%
  5. What are the advantages and disadvantages of a turboprop incomparison with a turbojet?
    • +: low TSFC, high thrust at low airspeed, able to carry more load requireing short runways.
    • -: heavier and more complicated, limited to 450 knots
  6. How is a turboshaft constructed?
    Gas turbine with a free air/power turbine.
  7. What is a free turbine?
    A turbine that is not mechanically connected to the compressor and aft of the gas generator turbines.
  8. Describe the sections of a turboshaft and its function.
    • Gas gen: provides exhaust gas to drive the free/power turbine.
    • Free/power turbine: connceted to the main transmission, it converts the heat energy to mechanical energy to drive the rotors.
  9. What percentage of a turboshaft's thrust comes from the exhaust?
    negligible

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