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In axial flow compressors, the primary purpose of IGVs (fixed or variable) is to guide the airflow onto the first stage rotor blades at an appropriate or required angle of attack.

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Variable inlet guide vanes are typically found in axial compressors and turbines. They operate by adjusting the angle of the guide vanes to control the flow of air or gas entering the compressor or turbine. By changing the angle of the guide vanes, the system can optimize performance by altering the velocity and direction of the incoming fluid flow.


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