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M15 GTE > Combustion > Flashcards

Combustion Flashcards

1
Q

What’s the purpose of a combustion chamber

A

Produce stream of hot gas by the continuous combustion of a fuel air mixture

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2
Q

What are requirements of the combustion chamber

A

Small and light to save weight
a dependable cooling system
a high operating lifetime

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3
Q

Combustion needs to occur with a minimum of what

A

Minimum of pressure loss

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4
Q

Main component of combustion chamber

A

Casing and flame tube which is inside casing

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5
Q

What is the chamber casing

A

Outer shield of combustion section which takes pressure loads

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6
Q

What does the casing housing support

A

Supports flame tube and other combustion components

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7
Q

Conditions for combustion

A

Correct air to fuel ratio

air velocity slow enough to make sure combustion is complete

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8
Q

How is fuel and air mix ignited

A

Electrically by igniter plug

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9
Q

When does the ignition turn off

A

Once combustion has started

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10
Q

Kerosene air ratio

A

15:1 air to fuel

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11
Q

2 different airflows in compressor

A

Primary and secondary

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12
Q

How much primary air is used for combustion

A

20-30% of airflow

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13
Q

What zone does the flame stabalise

A

Primary zone

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14
Q

Centre flame temperature

A

2000 degrees C

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15
Q

What’s the secondary airflow used for

A

Cooling as combustion chamber components can melt

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16
Q

How does secondary air enter dilution zone

A

By dilution air holes

17
Q

3 types of combustion chamber

A

Can

Can-annular

Annular

18
Q

Most popular chamber used

A

Annular

19
Q

Disadvantage of annular

A

Maintenance and manufacturing costs

20
Q

Advantage of annular

A

Good efficiency and high service life

21
Q

What does the flame tube do

A

Stabilisers , controls and guides flame during combustion

22
Q

What does the combustion case do

A

Carries structural loads between compressor case and turbine case and houses flame tube

23
Q

What is external components of combustion section

A

Fuel nozzle & igniter plug

24
Q

Combustion case assembly parts

A

Outer wall

Inner wall

A diffuser

25
Q

What does a diffuser do

A

Slows air with a divergent duct

26
Q

What are exit guide vanes

A

Stator vanes at the last stage of the HPC

27
Q

What’s the parts of the flame tube assembly

A

Outer & inner liner

Outer & inner cowl

Dome

28
Q

What does the dome connect

A

Connects inner and outer liner

29
Q

How is the flame tube and fuel nozzle connected

A

Bolted to combustion case structure

30
Q

What is two piece flame tube

A

Outer liner and dome flame tube made is one piece

31
Q

Where is the dome in a two piece flame tube

A

Centred in combustion case by mounting pins

32
Q

How is the inner liner different in a two piece flame tube

A

Bolted to inner flange of HPT nozzle guide vanes

33
Q

What vanes does primary airflow enter flame tube through

A

Swirl vanes

34
Q

How does secondary airflow enters flame tube

A

Passes cowl and enters through liners

35
Q

How does secondary airflow cool the flame tube

A

Forms cooling film on inner surface which protects liner from intense heat

36
Q

What is the use of a cooling film process called

A

Film cooling

37
Q

What are the 3 methods of film cooling

A

Machine

Splash

Corrugated strips

38
Q

I’m transportation cooling method what are flame tube liners covered with

A

detachable tiles called liner segments

39
Q

What’s a benefit of transpiration cooling method

A

Requires less air for cooling the flame tube

M15 GTE (19 decks)

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