Turbine Engines Flashcards
(31 cards)
What determines the amount of airflow through a turbine engine
forward speed , compressor speed,and air density
Name the two types of compressors
Axial and centrifugal
What are the different types of combustion chambers used in turbine engines
Can can-annular, annular, multiple can and reverse flow
What is shaft horsepower
torque developed by a turboprop or turbo shaft engine
Name the main components of a typical APU
A small power turbine and electrical generator
What prevents the combustion chamber from burning
Cooled air inside of the liner
How is an APU generally started
With its own electrical starter and battery power
Where does the APU get it’s fuel supply
From one of the aircrafts main fuel tanks
When is the greatest demand placed on an APU
When supplying bleed air
Name the major components in a gas turbine engine
inlet, compressor, diffuser, combustion chamber, turbines, exhaust, gearbox and accessory
Name two different methods for attaching turbine engine rotor blades to the rotor disks
Dovetail, and Fir tree
What function do axial flow turbine nozzles perform
Directs mass airflow to drive the turbine rotor at a specific angle
How are thermal stress relieved on a turbine disc
By directing bleed air into the face of the disk, or by grooves being cut in the disk
What are carbon seals used for in turbine engines
Used as oil seals for the rotor shaft bearings
What is used to prevent a heavily loaded APU from exceeding its maximum EGT
Load control valve
What powers the variable inlet guide vanes used on some APUs to regulate compressor intake airflow
Fuel pressure
When a tubofan or turbojet engine is shut down, what should a mechanic listen for during coast down
Any rubbing sound or other unusual noises
How can you tell if the turbofan or turbojet engine is out of trim
High EGT
Name the different types of compressor blade damage that may be found during inspection
Dents, cracks, galling, pitting, scratching,and burns
What kind of markers can be used to mark the parts in hot and cold sections during repair
Layout dye, felt tip marker, and chalk
How does relative humidity affect turbine engines
Negligible effect
What criteria determines replacement of life limited turbine engine components
Cycles, hours, and calendar time
If turbine blades are removed from a turbine disc, why should they be re-installed in the same location
To maintain balance of the turbine wheel
How are gas turbine engine tachometers calibrated
By percent R.P.M
