11. Primary Air=
approximately 25% of total air
Remaining 75%=
used to form an air blanket
around the burning gases and to
lower the temperature
Intro
Process
Fuel Supply
Types
COMBUSTIONMaterials
CHAMBER
AE 424
12. The air used for burning fuel is
“primary” air.
• Cooling Air drops the temperature to a
value that the turbine inlet
guide vanes can withstand
• Cooling air is “secondary” air
(controlled and directed by holes and
louvers) Supply
Intro
Process
Fuel
Types
COMBUSTIONMaterials
CHAMBER
AE 424
13. • Continuous airflow helps prevent
CARBON from forming on
the inside of the liner
• Carbon deposits can cause HOT
SPOTS, block cooling air passages,
which then shortens burner life
Intro
Process
Fuel Supply
Types
COMBUSTIONMaterials
CHAMBER
AE 424
15. • Blends air and fuel proficiently
• Controls the burning of large
amounts of fuel and air efficiently
• Dampens the hot combustion
gases
• Ensures that the air is expanded
and accelerated
** must be accomplished with minimum
Intro pressure loss and Fuel Supply
Process
maximum heat
Types release
COMBUSTIONMaterials
CHAMBER
AE 424
16. Combustors play a crucial role in
determining many of an
engines operating characteristics, such as
•fuel efficiency,
•levels of emissions and
•transient response (the response to
changing conditions such a fuel flow and
air speed)
Intro
Process
Fuel Supply
Types
COMBUSTIONMaterials
CHAMBER
AE 424
