Page 43 - The Jet Engine
P. 43
Compressors
the blade from skins of titanium incorporating a BALANCING
honeycomb core.
37. The balancing of a compressor rotor or impeller
36. Centrifugal impeller material requirements are is an extremely important operation in its
similar to those for the axial compressor rotors. manufacture. In view of the high rotational speeds
Titanium is thus normally specified though aluminium and the mass of materials any unbalance would
may still be employed on the largest low pressure affect the rotating assembly bearings and engine
ratio designs where robust sections give adequate operation. Balancing on these parts is effected on a
ingestion capability and temperatures are acceptably special balancing machine, the principles of which
low. are briefly described in Part 25.
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