Compressors, Gas Turbines and Jet Engines
Free air is the air at

0°C and standard atmospheric conditions
15°C and 1 kg/cm²
20°C and 1 kg/cm² and relative humidity of 36%
Atmospheric conditions at any specific location

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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

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

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Compressors, Gas Turbines and Jet Engines
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is

Heated
Exhaust gases drive the compressor
Bled gas from turbine is heated and readmitted for complete expansion
Compressed air before entering the combustion chamber is heated

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