Cobustion Chambers Flashcards
Components of combustion section
Casing
Flame tube
How is the flame tube protected from the extreme temperatures of combustion?
The secondary cooling and guiding air
Ceramic layer
What will hots spots indicate?
Blocked airflow or fuel nozzle problem
What percentage of air from the compressor is used for combustion?
20-30%
What percentage of air is used for cooling?
70-80%
How are the zones of the combustion chamber Identified?
Primary
Secondary
What cooling methods are employed on the combustion liners?
Active
Passive
Optimum combustion fuel/air ratio
1:15
Advantages of annular chambers?
More efficient Smaller and lighter Complete combustion achieved Flame propagation Thermal loading
Why is the flame tube only secured at one end?
To allow for thermal expansion
What is the purpose of the diffuser?
Air channels for cooling
Conditions for efficient combustion
Right fuel/air ratio
Slow enough air speed
What is the purpose of the combustion case?
Carry structural loads
