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Module 15 > M15.5 Combustion Section > Flashcards

M15.5 Combustion Section Flashcards

1
Q

Combustion chamber main components

A
  • combustion chamber casing
  • Flame tube
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2
Q

Functions of combustion for safe flight

A
  • Safe ignition (Ground and air)
  • Stable ops
  • Complete combustion
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3
Q

When are the igniter plugs switched off

A

After ignition

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4
Q

Kerosine-air mixture ratio

A

1:15 (K to A)

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5
Q

How much of the compressor air is used for primary combustion

A

20-30%

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6
Q

What is secondary air used for

A
  • Cooling
  • Flame control
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7
Q

How does secondary air enter the dilution zone

A

Dilution air holes

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8
Q

Low or high velocity for combustion

A

Low

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9
Q

What should the air velocity be for combustion or kerosine-air mixtures

A

2-15 m/s

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10
Q

Types of combustion chamber

A
  • Can
  • Can-annular
  • Annular
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11
Q

What combustion chamber is used on engines with centrifugal compressors

A

Can type

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12
Q

How is ignition transferred in can type combustion chambers

A

Interconnector tubes

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13
Q

What do the interconnector tubes do

A
  • Transfer ignition
  • Equalise pressurisation
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14
Q

Advantages of can type

A
  • Simple
  • Good strength
  • Replaced individually
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15
Q

Disadvantage of can type combustion

A

Heavy and need space

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16
Q

What is the common part in a can annular combustion chamber

A

Common outer ring and inner casing

17
Q

Advantage of can-annular combustion

A
  • Smaller than multiple can type
  • Good strength
18
Q

Disadvantage of can-annular combustion

A
  • High aerodynamic losses
  • Ignition can be hard to pass
19
Q

Advantages of annular chambers

A
  • Small but light
  • Better efficiency
  • Better thermal distribution
  • Smokeless
20
Q

Disadvantage of annular chambers

A

Expensive and difficult to remove

21
Q

An increase in combustion temp will do what to carbon monoxide and nitrogen oxide emissions

A
  • Decrease carbon monoxide
  • Increase Nitrogen Oxide
22
Q

Apart from fuel mixture how can emissions be lowered

A

Dual zone combustion chambers

23
Q

What is in front of the inner wall flange

A

Seal surface of the CDP (Compressor Discharge Seal)

24
Q

What is film cooling

A

Secondary airflow is used to cool the inner surface of the liners

25
Q

What type of flame tube cooling is used on modern engines

A

Machined cooling rings

26
Q

What type of flame tube cooling is used on older engines

A
  • Corrugated Strip Cooling
  • Splash cooling strip
27
Q

What is the most sophisticated type of flame tube cooling

A

Transpiration cooling method

Module 15 (20 decks)

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