Compressors are machines used to increase the pressure of the working fluid. There are several types of compressors. The most important types of rotating compressors are radial-flow, axial-flow and positive displacement.

The compression process (1-2) is irreversible but approximately adiabatic. The work input to the compressor is:

Win = m (h2 - h1)

m= mass flow of air
h2=Enthalpy at outlet
h1=Enthalpy at inlet

The pressure ratio of a compressor is defined as:


Po=Absolute pressure at outlet
Pi=Absolute pressure at inlet

The isentropic efficiency of the compressor is:

= (h2s-h1)/(h2-h1)

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