FLUID MECHANICS

 Inlet Guide Vane Valve (IGV) Mechanism

- Mr. E. Bravin Daniel, M.E., [Ph.d]



The IGV has multiple triangular-shaped vanes that allow the air to flow into the compressor in a swirl direction. The “pre-swirled” air reduces the amount of work needed from the main driver to spin the air entering the impeller. The directional flow increases as the vanes close, putting less stress on the impeller in comparison to an IBV, because of this inlet guide vanes are more efficient during turndown than inlet butterfly valves. 

working

Inlet guide vanes impart a whirling motion to the inlet airflow in the same rotational direction as the impeller. This decreases the power required to deliver the rated airflow and pressure. There are opportunities for energy savings when the compressor inlet is throttled.

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