Centrifugal Compressors

The operational principle of a centrifugal compressor (aka a radial turbofan) accords with that of a centrifugal pump, but the fluid is different. Now it’s a gas. It is built up out of an impeller with vanes that rotates fast in an abutting volute (Figures). The rotating movement of the impeller produces a pressure rise on the locked-in gas; the gas is propelled out of the impeller and caught in the volute. An under-pressure arises in the inlet, and this causes the gas to be sucked into the suction line.

Screw Compressors

A screw compressor is a type of rotary compressor that consists of two screw-shaped rotors with different profiles that can grip one another. They rotate in opposite directions. They can have different numbers of lobes. The main rotor (male rotor) has four lobes, while the female rotor or side rotor has six. When the rotors do not have the same number of lobes, they must be driven differently. The flow through the compressor is axial. Its compresses air due to screw action. The main advantage of using this compressor is that it can supply compressed air continuously with minimum fluctuation in delivery pressure.

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