The axial compressor is mounted on turbine shaft and consists of many stages as per it's capacity. It supplies all the air needed for combustion, cooling the turbine, blades, atomizing fuel oil and pneumatic instruments.
The air advances stage by stage later normally. Some air is passed to an air to air radiator, gets cooled and in turn is used for cooling the turbine rotor and stator blades.
Outlets are provided to supply atomizing air and instruments air from compressor outlet chamber. The instrument air tubing is given a long loop travel to allow it to cool through fins on the instrument air tubing is giving a long loop travel to allow it to cool through fins on the tube before reaching any valve.
Outlet is provided for a pressure switch for processing of various operations in combination with electronic governor. Science air pressure is dependent on axial compressor rotary speed (turbine shaft), the pressure reflects the speed relatively. Thus many calculations and operations are based on air pressure for easy processing, which are at the corresponding speed.
The inlet guide vanes (IGV) are fixed permanently in the required position and total air flow depends only on compressor speed during start up and running of gas turbine. The air can not return due to fast moving blades constantly pushing it forward.
The air temperature increases due to compression. Hence the part of air used for cooling the turbine blades is passed through a cooler at first for removing heat from it and than used for cooling.
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