Impellers in Gas Turbine (turboprop) Engines
Some turboprop engines use an impeller instead of an axial compressor. For example the Pratt & Whitney Canada PW100 uses a two-stage compressor with a low power impeller discharging air pressure on the high power impeller which compresses the air again into the combustion chamber. The fuel is mixed in at over 200 psi (1,400 kPa) and the mixture burns in the combustion chamber. The reason for using an impeller instead of an axial compressor is that the engine's length can be reduced.
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