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ANET A8 Octagonal Fan Duct

by selmark420 Jun 13, 2017
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Very nice approach, but if you are not adjusting the main flow passage area after each exit nozzle there will be virtually no flow (probably only at low velocity) at the backside. All these types of fan ducts seem not to play by the rules of aerodynamics.

good idea i improved the modell with new nozzels how becomes bigger at the backside and small at the frontside

Look at turbo machinery, e.g. a radial turbine, there too the main channel decreases in size when it looses flow to the impeller.

It is better to adjust the main flow passage, that way you can leave all nozzles the same size.