| Post Info | TOPIC: French H-Darrieus Hybride & Co |
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Bernd
Senior Member
Posts: 233
Date: Jan 24, 2010
| RE: French H-Darrieus Hybride & Co |
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Well, sorry for my simple "german english", i meaned the large holes like jerry said.
They make the blade under tsr 1 working like a drag turbine and above it works like a lift type shape.
Bernd
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Project
Veteran Member
Posts: 97
Date: Jan 24, 2010
| RE: French H-Darrieus Hybride & Co |
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| Caleb
If I'm looking at the same holes in the end that you are looking at, I think they are drain holes to let rain water out.
I'm thinking the 2 holes at the end of the blade is to let water out, and the holes along the trail edge of the blade are to catch wind to get the blades started instead of a savonious in the center????????????? Jerry |
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Caleb
Senior Member
Posts: 473
Date: Jan 23, 2010
| RE: French H-Darrieus Hybride & Co |
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| Bernd wrote:
hello benoh
a nice looking airfoil shape, for me it seems a little bit like a KF-profile.
The asymetric form is clearly visible.
Also the holes at the end are interessting formed.
-- Edited by Bernd on Saturday 23rd of January 2010 10:30:53 PM
If I'm looking at the same holes in the end that you are looking at, I think they are drain holes to let rain water out.
- Bryan
Mechanical Engineer turned stay-at-home dad. |
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Bernd
Senior Member
Posts: 233
Date: Jan 23, 2010
| French H-Darrieus Hybride & Co |
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hello benoh
a nice looking airfoil shape, for me it seems a little bit like a KF-profile.
The asymetric form is clearly visible.
Also the holes at the end are interessting formed.
-- Edited by Bernd on Saturday 23rd of January 2010 10:30:53 PM
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benoh
Member
Posts: 6
Date: Jan 23, 2010
| RE: French H-Darrieus Hybride & Co |
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| i think it's possible to change the savonius starter in system looks like this:  what do you think of this blade profile ? more video on youtube, just search "bayatenergy" |
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sjh7132
Guru
Posts: 1252
Date: Jan 22, 2010
| RE: French H-Darrieus Hybride & Co |
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| Caleb wrote:
I like the hybrid approach. I'm starting to think that a Savonius is not a good low wind turbine. My generator starts charging at about 110 RPM and goes up a little from there; so I usually charge between 110 and 160 RPM. The problem is that in low wind the turbine is doing all it can to get up to that speed and doesn't have any torque left to produce power. On the other hand, it is my understanding that a lift type turbine will zip up to a TSR of 4 or 5, so I'm thinking that a lift based turbine would help push things up to the charging range and provide extra torque until the TSR gets so low that drag becomes a factor. At that point, the Savonius can keep pushing the generator. Anyway, just a few thoughts.
Your problem could be just a mismatch between your turbine and your alternator. More turns with a thinner wire might have worked better. Before you scrap your turbine see if you can get some good power vs TSR measurements by changing the load. Maybe it's really not that bad a turbine. [or maybe it stinks like my first two. :-) ] Also are you wired in Y configuration? There is a way to double the voltage with a couple of caps and diodes that might work for you.
Steve
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Caleb
Senior Member
Posts: 473
Date: Jan 22, 2010
| RE: French H-Darrieus Hybride & Co |
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I like the hybrid approach. I'm starting to think that a Savonius is not a good low wind turbine. My generator starts charging at about 110 RPM and goes up a little from there; so I usually charge between 110 and 160 RPM. The problem is that in low wind the turbine is doing all it can to get up to that speed and doesn't have any torque left to produce power. On the other hand, it is my understanding that a lift type turbine will zip up to a TSR of 4 or 5, so I'm thinking that a lift based turbine would help push things up to the charging range and provide extra torque until the TSR gets so low that drag becomes a factor. At that point, the Savonius can keep pushing the generator. Anyway, just a few thoughts.
__________________
- Bryan
Mechanical Engineer turned stay-at-home dad. |
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electrondady1
Senior Member
Posts: 430
Date: Jan 22, 2010
| RE: French H-Darrieus Hybride & Co |
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is it a 3 phase alternator?
do a single test coil to see what sort of output you get at the appropriate rpm.
the alternator design you are following is for a horizontal axis windmill.
it may be necesary to use a different turn count and wire gauge.
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benoh
Member
Posts: 6
Date: Jan 22, 2010
| RE: French H-Darrieus Hybride & Co |
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at the moment there is no generator connected
i'm working on 1kw generator from hugh pigot manual
with two magnet disc and 12 coils...
@ Bernd:
hello i have contacted you on youtube my user name was "xfrenezy"
thanks for explications
in fact we can have more power with magnet disc turn left and coils turn right for example.
my rotor is composed 1 savonius in center H : 65cm D : 30cm
and darrieus 3* NACA 0018 With alumium 1mm
thx for reply!
see you soon
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sjh7132
Guru
Posts: 1252
Date: Jan 22, 2010
| French H-Darrieus Hybride & Co |
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Benoh, how much power do you get from the turbine in the picture?
(Combien de puissance le dispositif dans la photo produit-il ?)
-- Edited by sjh7132 on Friday 22nd of January 2010 12:52:27 AM
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Steve
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wiboater
Senior Member
Posts: 242
Date: Jan 22, 2010
| RE: French H-Darrieus Hybride & Co |
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| Your RPM's will only increase more if you have enough power to counter what the alternator wants to hold back. If the wings can't overpower the alternator they will each turn slower. so you will probably get some increase in RPM but probably not double. But by both turning slower you reduce any vibration and I think in very strong winds it would give you more power. The slip rings aren't that bad to make. You have to have good alignment between the Magnet rotors and the stator though because the airgap is small and it's harder to set with both turning. Hope I explained that ok. I'm glad I did the counter rotating on mine. |
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electrondady1
Senior Member
Posts: 430
Date: Jan 21, 2010
| RE: French H-Darrieus Hybride & Co |
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| bonjour benoit votre anglais c'est bon. mon vocabulaire en français ,ses tres petit. a member of the forum "wiboater" has built a working machine wiboater |
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Bernd
Senior Member
Posts: 233
Date: Jan 21, 2010
| French H-Darrieus Hybride & Co |
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Hello Benoit, i'm happy to see your here on this board.
If you turn both magnet disk in opposing directions, you wouldn't get more Power.
The reason is that at some times north-south poles are crossing and also north-north and even south-south.
Also you would get an extremly cogging, no chance.
But you can use a set where both magnetdisks are rotating in the same direction, and the "stator" with the coils in the opposing direction.
The disadvantage is that you have to use slip rings to connect to the rotating "stator".
BTW, what kind of airfoil shape do you use for the Rotor on the picture ?
Bernd
-- Edited by Bernd on Thursday 21st of January 2010 08:38:46 PM
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benoh
Member
Posts: 6
Date: Jan 21, 2010
| French H-Darrieus Hybride & Co |
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| Hello, i'm benoit and i come from north of france i started to make a vawt type Darrieus with savonius it's difficult to me speak english.... here my project with no wind dimensions H / 1 METRE D / 1.05 METRE  I Have any questions in this domain and the first is in the picture  if the magnet discs turn looks like the picture can we produce more power because the rpm is * 2 speed ? i'm waiting for wind to show video... see you soon! |
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