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Mini Bladeless Fan
by BoomZilla1, published
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After looking at the fan designs from Helix3D, I wanted to try one but saw some issues with it. His design was large (140mm), printed in large parts with lots of supports, needed to be glued together and takes almost a whole role of filament.
I found some good information here: https://www.researchgate.net/publication/288180188_Numerical_investigation_of_geometric_parameter_effects_on_the_aerodynamic_performance_of_a_Bladeless_fan with cross sections and charts that show what parameters have the most effect on performance. So I created a version that fits an 80mm fan, can be printed in separate pieced and snapped together and is not as big an investment to print.
As Helix3D found, while the thing does work with a simple axial computer fan, those fans don't create enough pressure to properly drive the bladeless design. So in the end I can say it provides almost as much air as the computer fan does by itself. Maybe I'll take a crack at designing a turbine compressor too. (Update 1/26/18, see https://www.thingiverse.com/thing:2771339 for a turbine base)
I used 0.2 with a 0.3mm nozzle
The three Cowl pieces should be printed with the front down and the pointed edge on top. The Bottom and Middle ones need supports from the baseplate, but there should only be small ones generated for a couple of overhangs near the bottom.
The Edge piece should be printed laying down with the two U shaped edges on the bottom and no support.
You need two Edge, two Middle Cowl, four Feet and one of everything else.
Make sure you file down the Cowl and Edge parts where they came off the build plate. The "elephant foot" on the first layer will make assembly more difficult. Also there are a couple of 1mm supports on the first layer to help hold things in place during printing and sanding. These should be removed when you are ready to assemble.
Carefully insert the upper/lower cowl parts into their corresponding edge parts. You need to get the three guides slotted on one side and the whole edge in the slot on the other. Next insert the middle cowls into the bottom cowl assembly. You may need to use a small tool to help get the leading edge of the middle cowl to sit behind the leading edge of the bottom cowl. Trim or bevel the edge a bit if necessary for a snug fit without forcing it (See the second cross section). Then insert the top cowl assembly to that using the same procedure. The last step can be a bit frustrating, you might want to use tape once you get one side, so it doesn't pop out when you work on the other.
I used a rack cooling fan like this: https://www.amazon.com/gp/product/B00D7O8NIW/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1 but any old 80mm computer fan should work. Attach the feet and base with M4x8 bolts and place the fan onto the base and enjoy.
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Mini Bladeless Fan by BoomZilla1 is licensed under the Creative Commons - Attribution license.
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- You must attribute (give credit) to the creator of this Thing.
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