Where is the hottest section of engine
Around turbines
What temperature should engine be maintained at
800-1150 C
What are engines divided into
Primary zones - isolate each other by bulkhead or seal
What are the engine zones
Fan case, core engine and intermediate compressor case
What is zone 1
Area around fan case, contains EEC, area vented by ram air
What is zone 2
Cooled by fan air from upper part of fan duct and exhausted at lower end back into fan air stream
What is zone 3
Area around HP compressor to turbine case
What is LP compressor bleed air used for
Sealing of engine bearing chambers
What is temperature of rear stages of compressor
350-400C
What are bleed ports
Small openings in compressor case adjacent to stage air is bled from. Location of port depends of pressure and temperature required. Often bled from HP stage as pressure and temperature is at maximum.
What is bowed rotor
Engine can bend due to different expansions between upper and lower engine zones. Happens after engine shutdown
