15.12 Flashcards
What is the acceptable range of temperatures
800 - 1150 degrees C
Where’s the hotter section of the engine
Around the turbines
How Is the engine exterior and engine nacelle cooled
By passing fan air around them
How do primary zones isolate each other
Fireproof bulkhead or seal
Where is zone 1
Fan case that contains accessory case and EEC
How is zone 2 cooled
By fan air from the upper part of the fan duct and exhausted at the lower end back into the fan air stream
Where is zone 3
Area around high pressure compressor to the turbine cases
Also contains fuel and oil lines
Where does air go once the lip is heated up
Air exits through a grill on the nose cowl
Where can the anti icing valve be viewed
Engine parameters page
What temperature does the rear stage of the compressor reach and how is it cooled
350-400 degress C
Cooled with air from intermediate compressor stage
How much secondary airflow is there
70% - 80%
How does combustion chamber cooling take place
Cooling air removes heat from combustion liner
Cooling air creates a film which acts as thermal barrier between hot gases and combustion liner Cooling
What heat do turbine blades operate at and how are they cooled
300 - 400 degrees C
Cooled with engine bleed air
How are Turbine nozzle guide vanes and turbine blades cooled
Compressor air which flows into a cavity below them
What’s used to seal engine bearing chambers
LP compressor bleed air
