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Merlino
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Joined: 14/06/2008
Location: Italy
Posts: 15

Posted: 10:12pm 24 Jun 2008

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Hi all
Look at this VAWT:
http://img238.imageshack.us/my.php?image=alpha2lgqz4.jpg

I'm wondering what happen inside of that kind of turbine: i can't figure out if wind can enter in the middle and how it could affect turbine behaviour from inside...
I don't speak english perfectly so i've done a couple of designs to clarifying my question.

Here is the same turbine,
without shell:
http://img103.imageshack.us/my.php?image=turbinasenzaguscioe e4.jpg

and with shell:
http://img525.imageshack.us/my.php?image=turbinacongusciopz4 .jpg

What kind of behavioral differences between the first one and the second one?
Thanks a lotEdited by Merlino 2008-06-26

Jarbar
Senior Member

Joined: 03/02/2008
Location: Australia
Posts: 225

Posted: 12:37am 25 Jun 2008

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Hello Merlino,I found this design of interest and already being manufactured in Europe.The scoops around the perimeter seem to catch the wind and direct it at right angles the blades.

http://www.gual-industrie.com/

Anthony

"Creativity is detirmined by the way you hold your tounge".My Father
"Your generation will have to correct the problems made by mine".My Grandfather.

Merlino
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Joined: 14/06/2008
Location: Italy
Posts: 15

Posted: 06:54am 25 Jun 2008

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Thanks for your reply.
I've already seen that VAWT but i don't like it at all... According to his curve of power he begins serious power generation only in the middle of a storm...

btw this wasn't exactly my question: I don't have those kind of deflectors in my model...
Bye

dazz
Regular Member

Joined: 15/04/2008
Location:
Posts: 78

Posted: 07:35am 25 Jun 2008

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Hi Merlino,

I wasn't able to get those pics.
It just redirects to imageshack.us
can't get them by entering the pic name in search either. Says not found.

Daryl

Merlino
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Joined: 14/06/2008
Location: Italy
Posts: 15

Posted: 01:12pm 25 Jun 2008

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Arrgh!!! You're right DAzz!! Thanks!!
I've tried to rewrite correctly those 2 links but there should be some kind of bug in this forum

By the way if you wanna see those images you have to cancel the space between the letters of those links... I hope you understand what I'm tring to say... In the second link there's a space between the last two 'e' letters and in the last link there's a space before the dot... well cancel those spaces...
Let me know if you can see those pics and what do you think about the answer to my question

ByeEdited by Merlino 2008-06-26

dazz
Regular Member

Joined: 15/04/2008
Location:
Posts: 78

Posted: 03:06pm 25 Jun 2008

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Hi Merlino,

ahhh, I forgot about the "space" problem

Ok, my guess is that wind will enter the centre space of the turbine quite easily. If the wind went straight through it probably wouldn't cause any problem, but I very much suspect that as the wind enters the centre space it deflects off all the front facing blades and creates a very turbulent airflow inside. As we know, no turbine likes turbulent air and it probably interferes with the whole running.
The centre shell in the last image would be to stop all of that and not allow turbulent air to reach the rear blades. Whether that makes it work better I don't know. There would be new problems to consider including low pressure zones at the rear of the turbine and turbulance generated by air bouncing off the centre shell.

Just some guesses. Don't really know much about it myself.

Cheers, Daryl

Merlino
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Joined: 14/06/2008
Location: Italy
Posts: 15

Posted: 03:45pm 25 Jun 2008

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Mmmmhh... intriguing problem

I'm gonna build them both and i'm gonna tell you what i'll discover

Kind regards

martinjsto

Senior Member

Joined: 09/10/2007
Location: Australia
Posts: 149

Posted: 10:04am 27 Jun 2008

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hi all,
these are the vane scroll blowers that are used on large industrial air conditioning systems or extraction units. i use to service and install them.
the air is designed to be taken in through the center and blown out through the blades usualy into a duct.
i am after one for a similar idear as they work well as a hawt, but require a large surface area on the vanes for adequate torque, or reduction gearing as they do spin very fast in moderate winds, this is seen from old units sitting outside spinning out of controle in moderate winds there was no load attached of cource.
maby increasing the vanes internaly would provide better results
martin

free power for all
McAlinden WA

Merlino
Newbie

Joined: 14/06/2008
Location: Italy
Posts: 15

Posted: 03:46pm 27 Jun 2008

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Mmmh... i think they work better as VAWT... What do you think about it?
Bye

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