ENGINE CROSS SECTION – HOT SECTION
COMBUSTION CHAMBER
The combustion chamber includes holes of various sizes that allow entry of
compressor delivery air. The flow of air changes direction 180° as it enters
and mixes with fuel.
Metered fuel is sprained into a reverse flow annular combustion chamber
through fourteen (14) fuel nozzles mounted around the gas generator case.
The nozzles are supplied with fuel by a fuel manifold and each has a built-in
flow separator.
TURBINES
Leaving the combustion chamber, hot expanding gases are reversed in flow
direction and are directed towards the compressor turbine blades by the
compressor turbine stator which accelerates them with a minimum loss of
energy.
Nearly two thirds of all the energy available from the combustion is needed
to drive the compressor (gas generator) and the engine accessories.
Gases leaving the single-stage compressor turbine are accelerated through
the power turbine stator vanes and drive the 2-stage power turbine.
The power turbine under the action of the hot gases, turns the output shaft,
located at the front of the engine.
The gases leaving the power turbine are expelled to the atmosphere through
the exhaust duct.
IGNITION
Two spark igniters, powered by a high-voltage ignition unit, are used to ignite
the fuel/air mixture during engine starting phase.