Wind Tunnel Desk Fan - Desk Fan V5: 120mm PC Fan

thingiverse

This is the fan version where I gave up and made something practical. I've got a few fan designs uploaded including some that aren't (you won't find V4 because it's not very useful but I might upload later, for now we're skipping a version) but most of them are hard to make and noisy. With the way that the weather is at the moment I wanted one that I could use without the rest of the family wanting to throw it out of the window. The design uses elements seen in wind tunnels so I'm not taking things from jet engines this time. The main element of this are the corner cascades, these are curved wing sections that turn the flow around the 90deg corner with low losses, they also straighten out the flow from the fan and make it smoother. You might ask: "Why are you taking all of this effort to turn the flow 90deg when you could just point the fan where you want it to go? Isn't that a waste of effort?" and you would be right. It is not really practical, I just wanted some wind tunnel features. It does give the fan quite a small desk footprint though, so that's nice. This fan uses a 12V 120mm PC fan which I'm running at a lower voltage to keep the noise down. Most PC fans should fit since there aren't any thickness constraints, if you have a thicker or thinner fan then the parts will fit around this. The fan is modular so you can print what you want and perhaps design your own parts. I've included the OpenSCAD file but be careful - it's not really very parametric because I didn't take the time to make it so. Just making a new nozzle wouldn't be very hard though since the interfaces are quite simple. The fan outlet fairing (boattail.stl) is optional. You'll find a box body and lid that I use for a DC-DC converter to reduce the voltage of the 19V laptop power supply to about 7V. It has a hole for a socket, you might be able to find one the same.