TM 5-685/NAVFAC MO-912
3-15. Principles of operation.
the combustor provide a spark to ignite the fuel/air
mixture for engine start-up. The igniters are deac-
a. Components. A typical gas turbine engine con-
tivated after start-up has been accomplished. Hot
sists of a compressor, combustor and turbine (see fig
combustion gases are expelled through the turbine.
(3) The turbine extracts energy from the hot
(1) The compressor is driven by the turbine
gases, converting it to rotary power which drives
through a common shaft. Air enters the compressor
the compressor and any load, such as a generator.
via an inlet duct. The compressor increases the air
Exhaust gases are vented via ductwork to the atmo-
pressure and reduces the air volume as it pumps air
to the combustor and through the engine.
(2) Fuel (liquid and/or natural gas) is delivered
(4) The air intake for a gas turbine engine usu-
to the combustor by a fuel system consisting of a
ally consists of a plenum chamber with a screened
manifold, tubes, and nozzles. Electrical igniters in
inlet duct opening. The plenum chamber and duct
Figure 3-19. Typical gas turbine engine for driving electric power generator.
Figure 3-20. Gas turbine engine, turboshaft.