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M15 GTE > Turbines > Flashcards

Turbines Flashcards

1
Q

Function of turbine

A

Drive compressor and accessory gear box

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2
Q

2 types of turbine

A

Radial and axial

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3
Q

What type of turbine is most common on modern aircraft

A

Axial

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4
Q

Advantages of axial turbine

A

Allows high airflow and creates high thrust , you can use as many stages as necessary

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5
Q

What does the turbine convert

A

Convert has energy from combustion chamber into torque

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6
Q

Two types of turbines

A

Impulse and reaction

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7
Q

What turbine does modern aircraft use

A

Reaction turbine

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8
Q

How can you prevent corrosion of turbine blades

A

Use correct jet fuel

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9
Q

What is creep

A

Blades become elongated

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10
Q

What factors effect creep

A

Material

Temperature

Time

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11
Q

What does the rate of creep depend on

A

Speed and temperature, if the increase there is more creep

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12
Q

How are HP nozzle guide vanes and rotor blades cooled

A

Air from engine HPC

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13
Q

What’s the most effect type of cooling

A

Film Cooling

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14
Q

How is plastic deformation limited

A

Efficient cooling of turbine materials

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15
Q

What’s a negative of film cooling

A

Small holes are difficult to make and expensive

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16
Q

Why is film cooling most effective

A

Maximum cooling effect with minimum cooling air which allows more air used to drive turbine

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17
Q

How are nozzle guide vanes cooled in the second sage

A

Convection and impignet

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18
Q

How are second stage rotor blades cooled

A

Convection only

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19
Q

Two types of clearance control

A

Passive and active

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20
Q

Where is passive used

A

HP & LP Turbines

21
Q

What’s the LP turbine cooling source

A

Fan air

22
Q

What’s an advantage of tip clearance control

A

Saves a lot of fuel

23
Q

How is clearance control valves controlled

A

Controlled by ECU and actuated by fuel pressure from hydro-mechanical unit

24
Q

When does active clearance control work

A

During climb and cruise

25
Q

When is active tip clearance most effective

A

When engine operates at high power for a long time

26
Q

At cruise how much of n2 is used

A

80-95%

27
Q

clearance control valve controlled with what motor

A

Torque motor

28
Q

What’s the parts of a Turbine construction

A

HPT , LPT , Turbine Frame

29
Q

Where is the turbine frame located

A

Behind low pressure turbine

30
Q

What loads do the turbine frame carry

A

Bearing loads of the aft end of LPT

Transmits loads to rear engine mount on turbine frame

31
Q

How is the HPT case made

A

In one piece

32
Q

How are nozzle guide vanes in the HPT made

A

Vane segments with each segment having usually 2 nozzle guide vanes

33
Q

Where is the inner seal located

A

Inner surface of nozzle guide vane segments

34
Q

Components of a HPT Rotor

A

Turbine disc

Rotor blade

rotating interstate seal

Fwd and rear blade retainers

35
Q

What’s an interstate seal

A

Acts as a spacer between 2 discs

36
Q

How are turbine blades held in place

A

Blade retainers

37
Q

What are the retainers in LP turbines

A

Strip type which fit into dovetail slots and are bent up at each end

38
Q

Rotor blade in HPT shape

A

Fir tree root

39
Q

Benefit of fir tree root design

A

Many contact surfaces

40
Q

What are the turbine blades used in rotor assembly

A

Open end and shrouded

41
Q

When are open end turbine blades used

A

Turbines with high rotational speeds

42
Q

How is the added weight in an shrouded blade in a LPT offset

A

Thinner blades which make it more efficient

43
Q

How are turbine discs installed

A

Directly splined or bolted

44
Q

How are HPT Blades cooled

A

Internal cooled by air form HPC

45
Q

What’s an aft major structural component

A

Turbine Frame

46
Q

What does the turbine frame support

A

1 or 2 turbine rotors & provides attachment points for the rear engine mount

47
Q

How big should a radial strut be

A

As short as possible to minimise expansion which keeps stress on frame hub low

48
Q

Tangengal struts minimise what

A

stress caused by thermal expansion

M15 GTE (19 decks)

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