Centrifugal turbine that sucks. Air. by DeepSOIC

Last crawled date: 3 years, 1 month ago

A centrifugal turbine similar to those in real vacuum cleaners.
The suction can be felt starting at c.a. 1800 rpm, becoming quite substantial at 5000 rpm (4 mbar). It was tested at 10700 rpm (the max I can get with my motor/power supply) and it didn't explode (take care when doing this!).
Thick vanes provide even air channel inside the turbine. Overbent vane ends are supposed to improve suction and reduce noise by Coanda effect (doesn't work ;-). Thick vanes are hollow to reduce weight (thus allowing higher rpm), printing time and material consumption. The drawback is that water can get trapped in them and create imbalance, so the turbine is not suitable for water.
(measured suction is 4 mbar at 5000 rpm. This is just slightly below theoretical value of 4.25 mbar as I have calculated. So, my coanda-aerodynamic-addition turned out to be complete bullshit! It is no more than a regular centrifugal turbine.)
Outer diameter is 100 mm. Discs are 1 mm thick (with a slight thickening near the motor attachment), vanes are 10 mm high. Inlet hole diameter is 20 mm.
There is a small hole in the center, which is to put the turbine on a standard 3.2 mm/1/8'' shaft (common for Dremel).
Parametric FreeCAD v0.15 model is available, so all sizes can be changed at will.