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M15 > M15.06 > Flashcards

M15.06 Flashcards

1
Q

What does the turbine do?

A

Extracts energy from hot gases which come from the combustion chamber

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2
Q

What are the two different types of turbine?

A

Radial and axial flow turbine

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3
Q

Where are axial flow turbines used?

A

Modern gas turbine engines

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4
Q

What’s an advantage of axial flow turbines?

A

Allow very high airflow

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5
Q

What does the turbine convert?

A

Gas energy from combustion chamber into turbine torque energy

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6
Q

What must turbine blades withstand at takeoff?

A

High centrifugal forces of several tons

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7
Q

What is material deformation known as?

A

Creep

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8
Q

What will be the result of high engine temperatures and speeds?

A

Increased creep

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9
Q

Why are turbines cooled?

A

Increase service life, better turbine efficiency

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10
Q

What is the easiest cooling method in HP turbines?

A

Convection cooling

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11
Q

What’s the best cooling method for the nozzle guide vanes and rotor blades?

A

Impingement cooling

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12
Q

Where is the film cooling method used?

A

Nozzle guide vanes at rotor blades

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13
Q

What is the disadvantage of film cooling?

A

The drill holes are hard to make so very expensive

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14
Q

Active clearance control systems have one or more?

A

Clearance control valve

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15
Q

What are clearance control valves on modern engines compared to old ones?

A

Shut off bales on older but modulating on newer

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16
Q

What does tip clearance control save?

A

Fuel

17
Q

The turbine section of a twin spool engine typically has?

A

HPT, LPT, turbine frame

18
Q

Are HPT cases made in one peice?

A

Yes

19
Q

What are the nozzle guide vanes in the HPT held in by?

A

Nozzle guide vane support

20
Q

How do you inspect the turbine?

A

Boroscope

21
Q

What does the interstage seal act as?

A

Spacer between tho two discs

22
Q

What are the blade retainers designed to do?

A

Hold turbine blades in place

23
Q

In HPT what is the name for the root of the blade?

A

Fir tree

24
Q

What are the two types of blade in modern engine?

A

Open end blades and shrouded blades

25
Q

What do shrouded blades reduce?

A

Vibrations

26
Q

What seal do shrouded blades have?

A

Knife edge seal

27
Q

Where does the air come from to cool the HPT blades?

A

High pressure compressor

28
Q

The turbine frame is the …. Major structural component of the engine

A

Aft

29
Q

What are the two arrangements for frame struts?

A

Tangential struts, radial struts

M15 (17 decks)

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