## Compressor

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)**

Where

** m= mass flow of air**

h2=Enthalpy at outlet

h1=Enthalpy at inlet

The pressure ratio of a compressor is defined as:

**r=Po/Pi**

where

**Po=Absolute pressure at outlet**

** Pi=Absolute pressure at inlet**

The isentropic efficiency of the compressor is:

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

Related topic:

Copyright © 1998 Taftan Data. All Rights Reserved