COMPRESSOR SECTION (Cont)

TM 55-2840-254-23

CENTRIFUGAL IMPELLER. Physically part of compressor rotor assembly. Designed to further

compress and direct air through air diffuser assembly.

AlR DIFFUSER. Provides path for compressed air between centrifugal impeller and combustion

chamber. Contains straightening vanes inside that remove air swirl created by the

centrifugal impeller.

INTERSTAGE AIR-BLEED ACTUATOR. Pneumatic device that controls compressor air-bleed by

tightening and loosening metal band over vent holes in compressor housing. Re-

ceives input signal from fuel control.

COMPRESSOR BLEED BAND. Metal band located around vent holes toward rear of compressor

housing. By tightening and loosening bleed band, a regulated amount of air can be

bled from compressor. This allows more rapid acceleration without surge. Con-

trol led by interstage air-bleed actuator.

AIR GALLERY COVER. Fits around aft end of compressor housing. Holes in compressor housing

allow heated air to flow into air gallery cover. Port is provided in cover for custo-

mer use of this air.

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