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Assignment 5-5-3

Turboprop and Turboshaft Engines Review

QuestionAnswer
1. Describe the basic construction of a turboprop engine. Gas generator with a reduction gearbox, torque meter assembly, and a propeller assembly
2. What component produces the majority of thrust in a turboprop. Prop(90% of total thrust).
3. Why are reduced gears required in a turboprop? To keep the blade tips subsonic. Converts high RPM at low torque to low RPM at high torque.
4. How much thrust is produced from the exhaust gasses of a turboprop? 10%
5. 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 knot
6. How is a turboshaft constructed? Gas generator with 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 section of a turboshaft and its function? 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.
9. What percentage of a turboshaft's thrust comes from the exhaust? Negligible
Created by: Rudyrm
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