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CAA Module 15 > Module 15.5 Combustion Section > Flashcards

Module 15.5 Combustion Section Flashcards

1
Q

What are the two combustion chamber cooling methods?

A
  • Transpiration
  • Film
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2
Q

What are the 3 types of combustion chamber?

A
  • Can-type
  • Can-annular
  • Annular
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3
Q

What are the requirements for a combustion chamber?

A
  • Safe ignition
  • Stable combustion
  • Complete combustion
  • Equal temperature distribution
  • Min pressure loss
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4
Q

The combustion chamber should be?

A
  • Small and light
  • Dependable cooling
  • High operating lifetime
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5
Q

What is the optimum air fuel ratio?

A

15:1

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6
Q

What is the percentage of secondary airflow?

A

70-80%

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7
Q

What is inside the casing?

A

Flame tube

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8
Q

What is the function of the flame tube?

A

Control and guide the flame

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9
Q

What cools the flame tube?

A

Secondary airflow

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10
Q

what sprays the fuel into the centre of the airflow?

A

Fuel nozzle/injectors

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11
Q

Air is slowed before entering the combustion chamber to ensure what?

A

Complete combustion

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12
Q

What is the percentage of primary flow?

A

20-30%

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13
Q

What is the primary airflow used for?

A

The combustion process

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14
Q

What causes the vaporised fuel that is mixed with the air to combust?

A

Igniter plug

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15
Q

Where does secondary air flow into the flame tube?

A

Dilution/mixer zone

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16
Q

What are the advantages of can-type chambers?

A
  • Simple design
  • Good structural strength
  • Removed and replaced individually
17
Q

What is the difference between can-type and can-annular?

A

Can-annular, all of flame tubes share the same case

18
Q

What are the 3 major parts of an annular combustion chamber?

A
  • Dome
  • Inner liner
  • Outer liner
19
Q

How many flame tubes are in an annular combustion chamber?

A

One

20
Q

What does the dome house?

A

Fuel nozzle and swirl vanes

21
Q

What is the special design for APU and Small GTE called?

A

Reverse flow

22
Q

What are the 3 sections of an annular combustion chamber?

A
  • Case
  • Flame tube
  • External components fitted to outer wall
23
Q

What are the 3 parts of a combustion case?

A
  • Outer wall
  • Inner wall
  • Diffuser
24
Q

What prevents air leaks in front of the inner wall flange?

A

Compressor Discharge Pressure (CDP) Seal

25
Q

What are the vanes known as at the end of the HP compressor?

A

Exit guide vanes

26
Q

How many igniters are found in an annular chamber?

A

Two

27
Q

What does the flame tube dome section connect?

A

The inner and outer liner

28
Q

What method of cooling is between the inner surface of the liners?

A

Film cooling

29
Q

Where does the air go in transpiration cooling?

A

Enters the flame tube by radial holes in the liner

30
Q

What is a method of reducing emissions?

A

Dual dome

CAA Module 15 (18 decks)

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