9.3.
OPERATING CHARACTERISTICS
A cross-sectional view of the T74 showing the airflow through the engine is illustrated in
figure 9.2. Inlet air enters the engine through a circular chamber formed by the compressor inlet case
where it is directed to the compressor. The compressor consists of three axial stages combined with a
single centrifugal stage.
A row of stator vanes, located behind each rotating disk, diffuses the air, raises its static
pressure, and directs it to the next stage of compression. The compressed air passes through a diffuser,
turns ninety degrees in direction, and is then led through straightening vanes into the combustion
chamber liner.
Figure 9.2. Airflow.
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