What is the main role of the Air Intake in GT power plants ?

To supply the required amount of clean air at the inlet of compressor for combustion process and other uses of Gas turbines.

It's obvious for Combustion Process , Although air compressor of GT Decrease the GT efficiency but it's necessary for firing.

Air is required for Combustion in COmbustion system where is mixed with Natural Gas for burning. Inlet filters are installed upstream of Gas Turbines to remove any impurities. Compressors are installed to compressor the air before mixing with Natural Gas.

Air aids the combustion process.

To supply the required amount of clean air (Oxygen) for combustion process

Air intake for fuel mixture, which is compressed in Axial flow compressor directed towards combustion chamber for the ignition activity

without air, combustion is not possible and to complete fire triangle Air (Oxygen) is mendetory.

Air intake comes from the athmosphere thru Air intake housing via air compressor for the firing of combustion chamber to create hot gasses to deflect in turbine blades to rotate.  Air is one component of the fire triangle.

For every combustion engines it requires clean air to create the conbustion. Because without oxigen we cannot create a flame.

Clean and dry air combustion

ais is required in generating station for combustion.