Compressors, Gas Turbines and Jet Engines
In axial flow compressor, exit flow angle deviation from the blade angle is a function of

Blade camber and space-chord ratio
Space-chord ratio
Blade camber
Blade camber and incidence angle

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Compressors, Gas Turbines and Jet Engines
Clearance volume in actual reciprocating compressors is essential

To attain high volumetric efficiency
To accommodate Valves in the cylinder head
To provide cushioning effect
To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

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