5 - Combustion Section Flashcards
1
Q
What are the requirements of the combustion chamber
A
- Must permit safe ignition in both flight and on ground
- Stable combustion in all conditions
- No unburnt fuel
2
Q
What are the two main components of combustion chamber
A
- Combustion chamber casing
- Flame tube inside casing
3
Q
What conditions are necessary for safe combustion
A
Correct ratio of air and fuel
Air velocity must be slow enough to so that combustion is completed inside the chamber
4
Q
What is the ratio of air to fuel
A
1:15 (air:fuel)
5
Q
What are the two types of airflow from the compressor, their uses and %
A
Primary (combustion 20% / 30%)
Secondary (bypass 80% / 70%)
6
Q
What are the three types of combustion chamber design
A
Can-type
Can-annular
Annular
7
Q
Where are can-type chambers found
A
Old gas turbine engines
8
Q
What is the chamber made up of
A
- Air supply duct
- Fuel nozzle
- Flame tube
- Casing
9
Q
What makes can-annular chambers better than can-type
A
- Simple design
- Smaller and lighter
10
Q
What are the disadvantages of annular chambers
A
- Expensive to make
- Difficult to remove
11
Q
A
