this post was submitted on 11 Dec 2023
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The hub mostly reduces turbulence in the flow as well. Depending on if it’s on then intake o exhaust , it also has a number of effects.
As an intake, it compresses the incoming flow, as it comes to the blades with less drag- which makes the fan much more effecient.
As an exhaust, does the same, but would also expand the cross section (which slows the airflow,) it looks like the duct also constricts, though, so rather than changing the speed of the airflow, it’s removing the center void created by then fan’s own hub.
Which again smooths out the flow and makes it more effecient for whatever it’s hitting