Figure 1-4.
TM 55-2840-231-23
1-11. Compressor. The compressor assembly (fig. 1-4) consists of a compressor front support, case
assembly with stator vanes, rotor assembly with blades, centrifugal impeller, front diffuser assembly, rear
diffuser assembly, and diffuser scroll. Air enters the compressor through the front support. Struts in the
support guide the air and direct it in the proper direction into the first stage of the compressor rotor. The
air is then compressed by the six axial compressor stages and one centrifugal stage. As the air passes
through the axial stages, it is alternately accelerated by the rotor blade and decelerated by the stator
vanes. At the same time, it is compressed into an ever decreasing space. This results in an increase
of both air pressure and temperature. The sixth-stage compressor vanes direct the compressed air into the
impeller. The impeller vanes centrifugally accelerate the air through an ever decreasing space to further
increase the air pressure and temperature. It is then discharged across the diffuser vanes and directed
into the diffuser scroll. The diffuser scroll collects the compressor discharge flow at a constant velocity
and directs it rearward through two ports to the combustion section.
1-12. Turbine. The turbine (fig. 1-5) consists of a gas producer turbine, a power turbine support, a tur-
bine and exhaust collector support, a two-stage gas producer turbine, and a two-stage power turbine. The
turbine is mounted between the combustion section and the power and accessory gearbox. The two-stage
gas producer turbine drives the compressor and accessory gear train. The two-stage power turbine
furnishes the output power of the engine.
1-10
