(1) Turbine engine systems. The turbine engine system consists of air
and fuel control components, combustion chamber, turbines, and an exhaust
system (Figure 116).
(a) Air Supply. The air supply for compression is drawn from
outside the engine by the action of two compressors. It is cleaned and
directed to the engine air inlet. From the inlet, the air flows through a low
pressure compressor section and then through a highpressure section. The
compressed air then passes into a recuperator and flows into the combustion
chamber where it mixes with fuel vapor and burns.
(b) Fuel. Fuel is supplied by two control units which
automatically supply the correct amount for varying engine operating
conditions.
(c) Combustion. Electric ignition in the combustion chamber is
used only during the starting cycle. After the start, a continuous flow of air
and fuel vapor maintains a continuous burning in the combustion chamber until
the fuel or the air is shut off.
(d) Turbines. Exhaust gas leaves the combustion chamber through
discharge nozzles and forces a twostage turbine to turn. The highpressure
turbine drives the highpressure compressor rotor. The lowpressure turbines
drive the lowpressure compressor rotor. After leaving the lowpressure
turbine, the exhaust gas drives a twostage power turbine. The power turbine
supplies the force to turn the engine power output drive shaft.
(e) Exhaust. The exhaust gas leaving the power turbine is routed
through the recuperator to heat compressed air.
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