15.12

Question 1

What is the temperature at the nozzle inlet guid vanes

Answer 1

800 to 1150C

Question 2

What is secondary air flow used for

Answer 2

Used for cooling

Question 3

What is zone cooling and venting for

Answer 3

To remove harmful vapours

Question 4

Zone 1

Answer 4

Area around fan case

Ram air directed though pipes and tubes

Vented on right fan cowling

Asts as cooling for computer

Question 5

Zone 2

Answer 5

Cooled by fan air from the upper part of the fan ducts and exhausted at the lower end back into the air stream

Internal area by hp compressor

Question 6

Zone 3

Answer 6

The area around hp compressor to the turbine case

Question 7

What is the temperature at the rear of the hp compressor and were is the cooling are form

Answer 7

350 - 400 c

Air form earlier compressor stages cooled engine

Question 8

How is air ducted for turbine cooling

Answer 8

Air comes from centre shaft and out holes

Question 9

Which are is most impressive for cooling

Answer 9

Compressor discharge air (HP) where exit guide vanes is

Question 10

Sealing

Answer 10

LP compressor air used to seal bearing chambers

Air acts on sawtooth edges to prevent oil loss

Question 11

Where does all N1 air vent form

Answer 11

Drain mast or back of engine

Question 12

When does a bowed rotor occur

Answer 12

When the engine is shut down the engine can bend due to expansion between the upper and lower engine Zones