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CAA Module 15 > Module 15.12 Air systems > Flashcards

Module 15.12 Air systems Flashcards

1
Q

Large volumes of air provides cooling and maintains temperature to what acceptable range?

A

800 to 1150℃

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2
Q

Where is secondary air for cooling taken from?

A

Early stages of the compressor

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3
Q

Secondary air is used to cool what?

A
  • Turbine discs, blades and vanes
  • Exhaust bearing
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4
Q

What is zone 1?

A

Area around the fan case

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5
Q

What is zone 1 cooled by?

A

Ram air

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6
Q

What is zone 2 cooled by?

A

Fan air

Enters in the upper part of the duct and is exhausted into fan air at the low end

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7
Q

What is zone 3?

A

Area around the high pressure compressor to the turbine cases

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8
Q

How can anti ice systems be operated?

A

Manual or automatically

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9
Q

What are the turbine temperatures at the rear stages of the compressor?

A

350 to 400℃

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10
Q

How is the compressor cooled?

A

Compressor air cools the compressor from the IP/LP

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11
Q

How much air in the combustion chamber is used for transpiration and film cooling?

A

70-80%

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12
Q

What is one major limiting factor of GTE’s?

A

Temperature of the turbine section

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13
Q

To limit the effect in temperature variations cooling air is directed over what?

A

Each side of the disc

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14
Q

How does cooling flow enter the turbine blade?

A

Inlet at the butt of the blade

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15
Q

What air is used to cool the NGV’s?

A

Compressor discharge air from the exit guide vanes

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16
Q

What bleed air is used for sealing of engine bearing chambers?

A

Low pressure compressor bleed

17
Q

Pressurised air acting on the air and oil seals has what additional sealing effect?

A

Prevents oil from escaping the bearing chamber

18
Q

Where is the sealing air vented overboard?

A

Through the hollow N1 rotor shaft

19
Q

What secondary function/external air services are supplied by the compressor? (What is bleed used for)

A
  • Cabin pressurisation, heating and cooling
  • De-ice and anti-ice
  • Pneumatic engine start
  • Auxiliary drive units
20
Q

The external cooling system cools and ventilates what areas?

A

Area between cowling and engine cases

21
Q

What is a bowed rotor caused by?

A

Engine bending due to differences in expansions

22
Q

What does the external cooling system ensure?

A

All components in the fan and core components are sufficiently cooled

CAA Module 15 (18 decks)

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