Bad Inlet Conditions to Fans and the Effect Upon Centrifugal Fan Performance

摘要

For a fan impeller to operate efficiently and deliver the required airflow, it needs to have the eye of the impeller filled completely with air. The air needs to be uniform and it needs to have a full flow profile. Contrary to common belief, air is not always uniform in a duct system. This is caused by turbulence at fittings, swirl or vorticity in the system, and flow restrictions or blockages. All of these result in nonuniform flow profiles and reduced fan performance.