Turbine Engines Flashcards
(20 cards)
Explain the main difference and advantage of the 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 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 aircraft, compressor speed, and air density.
Name two types of compressors commonly used in turbine Engines.Fir
Axial and Centrifugal
Name two different methods for attaching turbine engine rotor blades to the rotor disk.
Dovetail, Bulb, and the 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 curt in the disk.
What is the purpose of turbine 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?
There will be a high EGT, idle, and maximum power will be off.
Name types of compressors blade damage?
Dents, galling, pitting, cracks, scratches, burrs, burns, and gouges.
What would the possible cause be for a turbojet or turbo fan engine having high exhaust gas temperature, low RPM, and high fuel flow at ALL engine pressure ration settings?
Possible turbine damage or loss of turbine efficiency.
Used to mark hot and cold section parts?
Dye, felt tip marker, or chalk 4-26
What is the effect or relative humidity on turbine power?
Negligible effect
