There are two types of losses in a centrifugal compressor: internal and external. The internal losses sustained in the compressor are manifested by an increase of enthalpy of air. The internal losses which occur in compressor are as follows:
- Friction between air and walls of flow passage
- Disc friction
- Leakage between impeller and casing
- Turbulence
- Shock
The compressor sustains an external loss in the form of bearing friction and windage loss. The friction losses are proportional to 
and hence proportional to 
. The incidence loss in terms of drag coefficient CD is proportional to 
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