15.5 Combustion Section Flashcards
What is the purpose of the combustion section
Raises temperature of air passing through the engine
What must a combustion chamber be able to do
-Safe ignition and stable combustion
-Perform complete combustion
-Be dependable and reliable
What are the main two components of a combustion chamber
-Combustion chamber casing
-Flame tube found in casing
What does the combustion chamber act as
Outer shield of combustion section, takes air pressure loads and protects components from engine heat
What does the flame tube do
Controls and guides flame
What burns in the combustion chamber
Fuel air mix made of compressed air and fuel (vapour)
What starts combustion
Engine igniter
What should the air-kerosene mix be?
15:1
How is airflow split in combustion stage split
-Primary airflow (has fuel added and ignited)
-Secondary airflow (goes around combustion stage)
What are the three types of combustion chamber
-Can type chamber
-Can annular chamber
-Annular chamber
What are the features of the can type combustion chambers
-Has an air supply duct
-Has a fuel nozzle
-Has a flame tube
-Has a casing
What is a can-annular combustion chamber
It has flame tubes around the combustor section, all flame tubes have a common outer casing and inner casing
What are annular combustion chambers
-Used on modern GTEs
-Has one annular flame tube
-Consist of dome, inner liner, outer liner
What is a special feature of annular combustion chambers
Reverse airflow direction in the flame tube
What parts make up the combustion case
-An outer wall
-An inner wall
-A diffuser
