Turbine engines Flashcards
Explain the main difference and advantage of turbo fan over turbo jet engines
Turbo jet- air passes through a turbo jet engine to produce thrust
Turbo fan - uses a fan to bypass some air around the engine core to provide thrust
Advantage - this provides additional thrust without increasing fluid 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?
Forward Speed of the aircraft
Compressor speed
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
Fir-tree
What is a split compressor system?
A dual or twin spool compressor. Compressors are connected to the turbine sections, 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 the carbon seals used for in turbine engines?
Oil seals for the rotor shaft bearings
What are the different types of combustion chambers used in turbine engines?
Can
Annular
Can-annular
Reverse flow annular
What functions do axial flow turbine nozzles perform?
Direct 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 cut into the disc
What is the purpose of turbine engine compressor field cleaning?
To remove contaminated 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 a turbo jet is out of trim?
EGT will high and idle and maximum power will be off
What is the possible cause for a turbo jet or turbo fan engine that has high exhaust gas temperature, low RPM, and high fuel flow at all engine pressure ratio settings?
Possible turbine damage, or loss of turbine efficiency
Name types of compressor blade damage
Dents
Galling
Pitting
Cracks
Scratches
Burns
Burrs
Gouges
What is used to mark hot and cold section parts?
Dye
Felt tip marker
Chalk
What is the effect of relative humidity on turbine power?
Negligible effect
