Compressors, Gas Turbines and Jet Engines
In jet propulsion power unit, the inlet duct of diverging shape is used in order to

Convert kinetic energy of air into pressure energy
Collect more air
Provide robust structure
Beautify the shape

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Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle with clearance on P-V diagram can be represented by following processes

Two adiabatic and two isobaric
One adiabatic, one isobaric and two constant volumes
Two adiabatic, one isobaric and one constant volume
One adiabatic, two isobaric, and one constant volume

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