WORKING PRINCIPLE

The axial compressor is generally driven by an internal combustion engine or a turbine. The work input to the rotor shaft is transferred by the rotor moving blades to the air, thus accelerating it. The space between the moving blades form diffuser passages so that the velocity of air relative to the blades is decreased as the air passes through them and consequently, the pressure rises. The air is further diffused in the fixed blades which also form diffuser passages. In the fixed blades, the air is turned through an angle so that its direction is such that it can pass to the next ring of moving blades without shock. Generally, 5 to 14 stages are used.