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5-5 Turboprop and Turboshaft Engines SQ
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Describe the basic construction of a turboprop engine.
Gas generator with a reduction gearbox, torquemeter assembly, and a propeller assembly.
What component produces the majority of thrust in a turboprop?
Prop (90% of total thrust)
Why are reduction gears required in a turboprop?
To keep the blade tips subsonic.
Converts high RPM/low torque to low RPM/high torque.
How much thrust is produced from the exhaust gases of a turboprop?
10%
What are the advantages and disadvantages of a turboprop in comparison with a turbojet?
Advantages:
Low TSFC
high thrust at low airspeed
able to carry more load requiring short runways.
Disadvantages:
Heavier and more complicated
limited to 450 knots.
How is a turboshaft constructed?
Gas generator with a free air/power turbine.
What is a free turbine?
A turbine that is not mechanically connected to the compressor and aft of the gas generator turbines.
Describe the sections of a turboshaft and its function.
Gas generator:
Provides exhaust gas to drive the free/power turbine.
Free/power turbine
:
Connected to the main transmission, it converts the heat energy to mechanical energy to drive the rotors.
What percentage of a turboshaft's thrust comes from the exhaust?
Negligible
Author
dundane
ID
320972
Card Set
5-5 Turboprop and Turboshaft Engines SQ
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Updated
2016-06-16T14:45:31Z
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