Low Pressure Spool (N
1
)
The LP (N
1
) spool consists of a four stage, low
pressure, axial flow compressor and a three
stage, low pressure turbine. Both the com-
pressor and the turbines are mounted on a
common shaft.
NOTE
A stage is a paired rotor and stator.
Each stage of the axial flow compressor uti-
lizes rotating compressor blades to accelerate
the air, followed by static stator blades which
decelerate the air, converting kinetic energy
into pressure. This provides a steady rise in
pressure through the compressor stages, with-
out significant change to overall velocity.
High Pressure Spool (N
2
)
The high pressure spool (N
2
) consists of a
single stage centrifugal compressor driven by
a single stage turbine through an outer con-
centric shaft.
The centrifugal compressor consists of an im-
pellar (rotor), a diffuser and a compressor
manifold. As in axial flow compressors, air is
picked up and accelerated outwards towards
the diffuser. When the accelerating air reaches
the diffuser its velocity is reduced, converting
kinetic energy into pressure.
The high pressure spool also drives the ac-
cessory gearbox through a tower shaft and
transfer gear reduction system.
Combustion Chamber
The compressed air flows into a single reverse
flow annular combustion chamber in the turbine
section where it is mixed with atomized fuel
supplied by twelve duplex fuel nozzles. The
twelve duplex fuel nozzles consists of primary
nozzles used for starting and secondary nozzles
used in conjunction with the primary nozzles
for all other phases of engine operations.
The fuel-air mixture is ignited by the two ig-
niter plugs located at the six and seven o’clock
positions within the combustion chamber.
After the ignition cuts-out, combustion is self
sustaining. The resultant combustion gases
are then directed to the turbine by the transi-
tion liner.
Revision 1
7-4
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
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