Turbine Engines Flashcards
Explain the main difference and advantage of turbofan over turbojet engines
A turbofan engine uses a fan to bypass some air around the engine core and to provide thrust. The advantage is that
this 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 airflow through a turbine engine
The forward speed of the 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 disk
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 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 disk, or by grooves being cut in the disk
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 turbofan or turbojet is out of trim
High EGT at target EPR
