First propeller turns of my 600W wind turbine

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loop
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by loop » 19/04/08, 22:08

Hi nlc


If you have just connected a 20W bulb, it's normal that you do not have more than 20W ...

Absolutely not, I explain myself
The generator used is a permanent magnet alternator and not an automobile type alternator
There is no excitation current and therefore no output regulation.
If I had passed 20W, the light bulb would have simply burned

The power produced is intended to charge batteries (in sufficient number not to exceed the maximum load current), so the voltage regulation is done alone.
The only parameter that I could control to choose the load according to the speed of the wind would be the pitch of the propeller (live), but it is much more complicated.
In theory, the wind turbine should be started with the flag position and the angle of the blade changed as it accelerates to the point of maximum power.
At this point, the angle of incidence is close to 6 ° (angle for which the coefficient Portance / Trained is maximum)

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nlc
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by nlc » 20/04/08, 00:35

A bulb is neither more nor less than a resistance. If it was a 20W bulb, it means that it is given for 20W under 14V (roughly). In empty you had a voltage not much higher than 14V, so I insist it's quite normal that you have about 20W :D (the voltage has dropped close to 14V when you put the wind turbine in charge with the bulb).
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by Other » 20/04/08, 03:29

Hello

To determine the maximum power output of the alternator it is necessary to charge it progressively until the voltage (collapses)
1 lamp from 20 w to start 2 and 3 until the voltage drops and the RPM of the propeller decreases
Make a measurement amperage and voltage in DC (not to rely on the wattage written on the lamp which is reel only if one feeds it with its voltage) while supplying with power under it it distorts the values

Andre
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by SixK » 20/04/08, 11:19

Well it's not easy to be well aware of the photos, but your profile on the central part, seems to me to be in the wrong direction ...

Rather than going in the direction of the wind, the rear of the blade in the central part should oppose a little more to the wind.
It seems to me that the profile is like that on the picture of the eoliene under construction.

note i'm looking at other blade profiles, they seem to have done like you, so i'm not sure what's the best.

Otherwise I would try to gain maximum weight on the central part. It's useless mass to run ...

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by loop » 20/04/08, 22:15

Reply to SixK

Here is a picture of the profile at the end of the blade
I drew some vectors to indicate the components of the relative wind created by the flow and the rotation of the blade
It clearly shows that the angle of incidence is good, the twisting also

Image

Otherwise I would try to gain maximum weight on the central part. It's useless mass to run ...

The particularity of this generator is that the whole body revolves around the axis
Inertia is annoying to start the rotor but it is not a problem then (it is even better for a little stability of the rotation)
The weight of the blades is more influential because their center of gravity is farther from the axis of rotation (the inertia depends on the product of the mass by the square of the radius)

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by loop » 20/04/08, 22:41

In addition to the graph
In red the empty voltage
In green the maximum mechanical power

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jonule
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by jonule » 21/04/08, 10:28

hi looping and hat that took shape well,

what do you use as regulation?
how many batteries of how much A / h?
you use the generator 1kw?

why 600 w?
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by loop » 21/04/08, 12:35

Hi Jo

Nice to meet you on this topic

For the moment I do not have regulation
The first tests were done on a bulb and battery car, but there was no risk that I send a surge because of the low power produced
For the rest, I have 4 batteries 12V 75 AH, special autonomy, recovered, and in perfect condition.
I need to be able to load them at 4 x 7.5A = 30A, but I'm not there yet! : Mrgreen:
I also bought a small converter 300W that can even rotate my drill (near sinus voltage?)

About the power of the alternator, if you remember correctly, I wrote that the model in 12V is limited to 600W of power (manufacturing data)
the model 1KW, it is in 24V or 48 V

For now, I think that my problem of beginning of charge is related to my propeller which caps at high speed (beyond 4tr / sec)
Indeed, in use battery charge, as long as the charging voltage is not reached (12.5 to 14 V), the alternator rotates freely, as if the DC circuit after the bridge rectifier, was open
We can not incriminate the alternator in this case
I started to rework the last 1 / 3 of the blade to refine the profile and approach the NACA 4412
For information, at the end of the blade, the string of the profile must be about 50mm and its thickness 6mm !!!
It is not easy to precisely respect the dimensions with a rape and abrasive paper on spruce (manual planer to avoid)
Next step, control of the idle speed with the rotor and its "light" blades

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by jonule » 21/04/08, 12:47

OK!
for info a converter square signal is enough to train a drill ;-) but the yield is really low then. in 12v you can find everything: lighting, converter for laptop etc ...

if you work by converter to buy: you can 24V plug 2 2 12 batteries in series, so that it makes you the same power available but in 24V (there are lighting 24v and converters 12 / 24).

finally everything is possible as long as there is wind!

for the load that is not done as long as the 12.5 14 (15 actually) V are reached, a regulator will do this work, especially those pulsation type PWM, which will collect the .. 12V and even 13V in peak 15V will better charge the battery, and also extend its life (maintenance pulsation) of the desulfator type:
http://www.nrjrealiste.fr/elec/batterie/Desulfateur.pdf

to weld yourself a shunt type regulator (when a charged wind turbine, bypass to resistances chuaffantes or other, washing machine fan etc ...):
http://www.nrjrealiste.fr/eole/r%E9gulateur%20surcharge%20shuntregulator18.pdf
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by loop » 06/09/08, 11:03

Hello

It's windy this morning, it's an opportunity to take out my prototype wind turbine to test the latest adjustments and improvements to the blades.
I was blocked by the sound emission quite unpleasant at high speed, so I modified the tip of the blade to reduce the whistling
Rather encouraging result, I consider that the noise has been reduced by 50% and becomes more reasonable.
here are some photos
There is no doubt, it has a "mouth" with its winglet blades.

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