Help in designing an Archimedes Wind Turbine

Post here for help on using FreeCAD's graphical user interface (GUI).
Forum rules
and Helpful information
IMPORTANT: Please click here and read this first, before asking for help

Also, be nice to others! Read the FreeCAD code of conduct!
benfoot
Posts: 3
Joined: Mon Aug 10, 2020 4:54 pm
Location: Worthing, U.K

Help in designing an Archimedes Wind Turbine

Postby benfoot » Mon Aug 10, 2020 5:21 pm

Help! i would like to design the blades of an Archimedes wind turbine, but I do not know how to start!

I would consider myself an intermediate, but infrequent user of FreeCAD and I have mainly used it to design rectangular and cylindrical shapes for 3D printing. Now, I would like to use FreeCAD to design the Archimedes blades (see attached image) in a DIY wind harvesting project. I would really appreciated any tips or help to set me off in the right direction.
energies-07-07893-g001.png
energies-07-07893-g001.png (480.91 KiB) Viewed 779 times
chrisb
Posts: 26934
Joined: Tue Mar 17, 2015 9:14 am

Re: Help in designing an Archimedes Wind Turbine

Postby chrisb » Mon Aug 10, 2020 8:04 pm

You can try a helix with an angle, or a noral helix where you cut material away with a groove. Shortly before christmas I posted Roland's christmas tree which may serve as inspiration.
User avatar
papyblaise
Posts: 2276
Joined: Thu Jun 13, 2019 4:28 pm
Location: France

Re: Help in designing an Archimedes Wind Turbine

Postby papyblaise » Tue Aug 11, 2020 6:24 am

One exemple
Attachments
da Vinci helico.FCStd
(525.75 KiB) Downloaded 21 times
da Vinci helico.PNG
da Vinci helico.PNG (47.83 KiB) Viewed 740 times
User avatar
hammax
Posts: 1182
Joined: Thu Jan 19, 2017 5:03 pm
Location: Ammersee

Re: Help in designing an Archimedes Wind Turbine

Postby hammax » Tue Aug 11, 2020 6:33 am

... having some doubt concerning the aerodynamic efficiency of that prop,
here is a possible design method in FC.

ArchWindTurbine_3.PNG
ArchWindTurbine_3.PNG (49.47 KiB) Viewed 730 times
Attachments
SpWindTurbine_2.FCStd
(369.98 KiB) Downloaded 23 times
SpWindTurbine.FCStd
FC.18.4
(345.87 KiB) Downloaded 22 times
User avatar
hammax
Posts: 1182
Joined: Thu Jan 19, 2017 5:03 pm
Location: Ammersee

Re: Help in designing an Archimedes Wind Turbine

Postby hammax » Tue Aug 11, 2020 8:44 am

... which way does the wind come from?


ArchWindTurbine_4.PNG
ArchWindTurbine_4.PNG (45.85 KiB) Viewed 681 times
Attachments
SpWindTurbine_3.FCStd
(476.78 KiB) Downloaded 25 times
thschrader
Posts: 1808
Joined: Sat May 20, 2017 12:06 pm
Location: Germany

Re: Help in designing an Archimedes Wind Turbine

Postby thschrader » Tue Aug 11, 2020 10:06 am

hammax wrote:
Tue Aug 11, 2020 8:44 am
... which way does the wind come from?
http://www.archimedesgreenenergys.com/about.htm
User avatar
papyblaise
Posts: 2276
Joined: Thu Jun 13, 2019 4:28 pm
Location: France

Re: Help in designing an Archimedes Wind Turbine

Postby papyblaise » Tue Aug 11, 2020 10:16 am

it is surprising it seems that there are only 2 propellers offset at 90 °, it must be unbalance :?:
User avatar
hammax
Posts: 1182
Joined: Thu Jan 19, 2017 5:03 pm
Location: Ammersee

Re: Help in designing an Archimedes Wind Turbine

Postby hammax » Tue Aug 11, 2020 1:18 pm

... my estimation is:
unrolling the blade gives a regular disc. Maybe some sector must be cut out => better not after some finetuning.
A simple part in aluminum with some bolts and a pipe as axle.
3 blades.


ArchWindTurbine_5.PNG
ArchWindTurbine_5.PNG (42.5 KiB) Viewed 628 times
Attachments
SpWindTurbine_4.FCStd
(230.39 KiB) Downloaded 24 times
GeneFC
Posts: 1438
Joined: Sat Mar 19, 2016 3:36 pm
Location: Punta Gorda, FL

Re: Help in designing an Archimedes Wind Turbine

Postby GeneFC » Tue Aug 11, 2020 3:39 pm

papyblaise wrote:
Tue Aug 11, 2020 10:16 am
it is surprising it seems that there are only 2 propellers offset at 90 °, it must be unbalance :?:
Some of the images seem to show only two blades, but when you look at more details it appears that three blades are used. Looks balanced. I have no idea if it is just "cute" or if it is really a good choice.

Gene
User avatar
papyblaise
Posts: 2276
Joined: Thu Jun 13, 2019 4:28 pm
Location: France

Re: Help in designing an Archimedes Wind Turbine

Postby papyblaise » Tue Aug 11, 2020 3:48 pm

Ho jes , Ok , whith 3 blades we can to have a good equilibre