Wind Turbines

[dedeleco]

In addition this wind turbine finesse not very low can be effective on a field of significant winds, to quantify, on a particular case.

[Lord Francis]

Thank you Hic for this simple and judicious idea of ​​a fusible rope but I think you have remained on the first page of this post, since I made this project considerably evolve: see my site:

http://soupl.eole.monsite-orange.fr/

[Lord Francis]

In this flexible wind turbine project, once I have done a full-scale test with my generator and my first model, the most difficult will be to find the ideal match: surface area and number of blades in relation to the generator, for a final version. Let's say "exportable."
With rigid blades, there are charts that allow to calculate exactly the optimum characteristics; length, surface, not, twisting, etc. depending on the generator.
With soft blades, it becomes completely empirical.
The only effective method seems to be trial and error.
If readers, more DIY than me, want to try, I would obviously be very interested in their results.

[dedeleco]

In turbulent wind, as almost always with neighboring obstacles or near the ground, this type of wind turbine could be as effective as a fine-blade wind turbine or better.
Even simple measures of power can help identify differences and compare.
It is simple, inexpensive, flexible, easy to repair, low noise and can be as effective in real wind conditions with surrounding obstacles.
Really interesting.
It can be realized in a wind turbine with vertical axis and as much efficiency, sail retracting, against the wind ..

[Lord Francis]

Continuation of my essays (and sometimes errors ...) here is a first video but of rather poor quality unfortunately:
http://www.youtube.com/watch?v=Q2g3qx4L9jk

First concrete result: the electrical efficiency with the generator of a commercial sailing wind turbine: an 6 Aerogenizer, is satisfactory in strong winds, with a hundred revolutions / min. But I have to build a proto with smaller blades to have a number of revolutions / min equivalent to the wind turbine rigid lower wind, because the optimal performance of this generator is 300 rev / min.

Meanwhile, I'm currently doing another proto, inflatable this time, with as a flexible armature, small puddles comparable to those of kite surfing sails. To test it, I plan to do it at first without a generator that would be too heavy to make it take off like a kite.
Of course, I will publish my results on the forum.

But if a handyman who is more efficient than me wants to try this "soupl'éole", I would be very interested in its results with obviously its constructive criticisms and possible improvements.
It is with this hope that I chose to disseminate this idea under "creative common", hoping for the same efficiency as "open source" software in the IT field where everyone can make a contribution ...

[FPLM]

The design pleases me a lot and the idea of ​​"free material" even more because without all the mercantile constraints, the quality takes on a whole new dimension. Just compare the quality of linux based OS and microchiotte crap.

A wind turbine with a shy yield is not necessarily a problem if its realization is for a derisory coup because in the end, it is the energy cost compared to the cost of implementation / maintenance premium. Especially since the returns often improve, the finances more rarely ...

Playing on the position of the curvature of the extrados would be another way to regulate the speed without changing the useful surface. If the blade has an additional rod, marking the longitudinal curve of the extrados, which can move laterally and in proportion to the amplitude of the centrifugal force, this one would see its extrados to thin with the attack and to round off to flight as the speed increases. It's a bit like the blade is gradually reversing the leading edge and the trailing edge.
This should decrease the speed without decreasing the wind surface area (and thus the density / power).
Playing only on this factor also makes it possible to reduce the rate of absorption of the blades by elastic damping (deformation) keeping the wing tight.

It's an idea like that by the way, maybe a foolishness besides, I'm not able to give it a value.

Anyway, it's a nice project to follow and open source and more!

[Edit]
That being said, to be honest, the reduction in the wind surface area is minimal, so I do not think it can affect performance visibly.
[/ Edit]

[Lord Francis]

Hello "fplm"
Thank you for your support to my project.

Your idea of ​​a blade profile modulated according to the centrifugal force is very original.
If I understand correctly: the lateral displacement of a movable rod inside the flexible blade, would pass its initial "NACA" profile to a teardrop shape in the awnings.
This displacement of the concavity of the extrados, from the leading edge to the trailing edge, would probably lead to an aerodynamic stall of the blade, and therefore its slowing down, which would make this self-regulated wind turbine as a function of the force of the wind.
It is indeed very ingenious!
You still have to find a simple process to implement this idea.
But I often had the opportunity to see it: it's harder to keep things simple than complicated.
Good luck and congratulations for your idea.

[FPLM]

Thank you for your message encourage.
Yes thats exactly it.
Indeed, the simple and effective implementation is not easy to conceive. I'll think about it.
Good luck too for the future.

[Lord Francis]

Hello everybody
I'm relaunching this post on a modern wind turbine, because I just built two small operational prototypes that give great results.
See the "Examples" page of my site:
http://soupl.eole.monsite-orange.fr/
Not having the possibility to build a bigger prototype, (garden too small and neighbors unfavorable to renewable energies ...), I am always looking for amateurs wishing to build their domestic wind that could help me to improve this concept.

[Cuicui]

Hello everybody
I'm relaunching this post on a modern wind turbine, because I just built two small operational prototypes that give great results.
See the "Examples" page of my site:
http://soupl.eole.monsite-orange.fr/

Hello Francis
I am very impressed by your important research work for these soft, simple, efficient and inexpensive wind turbines!