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This is the latest (maybe final?) version of my printed desk fan project and it's the first one that is actually a practical fan.
The fan uses a centrifugal compressor to generate airflow, driven by a brushless DC (BLDC) motor that is controlled by a BLDC motor driver and an Arduino nano.
Is the fan quiet? It's not _offensively_ loud (in my opinion) but it is in *no way* silent; it makes a whining noise from the motor drive and there is clear noise from vibration of the rotor (this will be reduced if your rotor is well balanced). The airflow from the fan is very smooth, however. There is no choppiness that you get from open blade fans and the airflow is very directed so you can have it further away than standard open blade desk fans.
The shroud around the nozzle was supposed to help entrain more air into the jet - I'm not sure it works. The inlet probably should be larger for efficiency but I didn't want to allow a gap big enough easily to let fingers in. With that said: children's fingers might still fit in and while the distance from the intake to the compressor is big enough that people will small enough fingers to get into the gap wouldn't reach the blades I would STRONGLY suggest that you keep this out of reach of children.
Was it aerodynamically designed? No, not at all. I followed some principles in turbomachinery books (mainly this one…
