Turbine Engines Flashcards
Explain the main difference and advantage of turbo fan over turbo jet engines?
A Turbofan engine uses a fan to bypass some air around the edge and core and to provide thrust. The advantage is that it provides additional thrust without increasing fuel flow.
Name the major components in a gas turbine engine.
Air inlet, compression section, combustion section, turbine section, exhaust section, gearbox, and accessory section
What determines the amount of air flow through a turbine engine?
The forward speed of the aircraft, compressor speed, and air density
Name two types of compressors commonly used in turbine engines.
Axial and centrifugal
Name two different methods for attaching turbine engine rotor blades to the rotor disc
Dovetail, bulb, and fir tree type root
What is a split compressor system?
Also called dual or twin spool compressors. These are connected to the turbine section one inside the other.
What prevents the combustion chambers from burning?
Cooling air along the inside of the liner
What is the purpose of interconnect tubes between the can-type combustion chambers?
Flame propagation during start
What are carbon seals used for in turbine engines?
They are used as oil seals for the rotor shaft bearings
What are the different types of combustion chambers used in turbine engines?
Can, Annular, Can-Annular and reverse flow annular.
What functions do axial flow turbine nozzles perform?
They direct the mass airflow to drive the turbine rotor at a specific angle
How is thermal stress relieved on a turbine disc?
By directing bleed air onto the face of the disc, or by grooves being cut at the disc
What is the purpose of turbine engine compressor field cleaning?
Remove contaminant deposits and improve performance
What methods are commonly used to accomplish turbine engine compressor field cleaning?
Fluid flush and abrasive grit blast
How can you tell if a turbo fan or turbojet is out of trim?
There will be a high EGT, idle and maximum power will be off
