L.p. Compressors Parts

(Page 4) End item NSN parts page 4 of 64
Part Number
NSN
NIIN
002-0001 Tapered Roller Bearing Cup
001000376
002-003990-013 Hexagon Plain Nut
009349757
002-19-20-0001-0002 Valve Seal
002009057
002-99874 O-ring
001661081
002017 O-ring
001660967
002121T Injector Rack
001269712
00213-0205 Tapered Roller Cone And Rollers
006061841
0022-074 Turnlock Fastener Eyelet
002822045
0022074 Turnlock Fastener Eyelet
002822045
002222 O-ring
005956327
002389 O-ring
005992934
002657-00 O-ring
005797545
00276-96 O-ring
005822855
003-007868-001 Socket Head Cap Screw
000685409
003202 Pipe Nipple
002221839
003216 O-ring
006410231
003216EB O-ring
006410231
003222EE O-ring
010062129
003223EB O-ring
001716649
003223EE O-ring
006410231
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L.p. Compressors

Picture of L.p. Compressors

Jet engines and other gas turbine engines are often uprated by adding a zero-stage, sometimes written '0' stage,

At a given core size, adding a stage to the front of the compressor not only increases the cycle overall pressure ratio, but increases the core mass flow. A further uprating may be done by adding another stage in front of the previously-added zero stage, in which case the new one may be known as a zero-zero stage.

A comparison with other ways of uprating an existing engine without drastically redesigning the engine shows for a particular case, eg the Rolls-Royce/SNECMA M45H, the thrust could have been increased by 25% with a zero-staged l-p compressor or 10% with either an improved HP turbine or with water injection.

Zero-staging is also combined with other modifications to provide increased thrust or lower turbine temperature. It may be required for an existing aircraft weight increase, or for a new application, as shown by the following examples.

A 15-stage Rolls-Royce Avon powered the Lightning F.1. A zero-stage, together with a new turbine, was added (total 16 stages) for the Caravelle III. A zero-zero stage was added (total 17 stages) for the Caravelle VI.

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