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Author Topic: will this work?  (Read 1945 times)

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silverbug

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will this work?
« on: July 01, 2004, 10:10:37 AM »
I am new to wind energy and my questions might seem a little silly to you experts.


My question is " are blades that are originally designed to move air, good for driving a generator"?


The reason I ask is because I am the proud new owner of a set of 7 ft blades off of a industrial cooling tower. 7+7+(2ft.hub) = 16 ft diameter rotor.

These blades are a carbon graphite coposite that are designed to move masive amounts of air.

The cooling tower fan had 4 of these blades and required 100 HP motor to drive them.

« Last Edit: July 01, 2004, 10:10:37 AM by (unknown) »
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Victor

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Re: will this work?
« Reply #1 on: July 01, 2004, 10:42:44 AM »
No' the airfoils and twist are backwards.
« Last Edit: July 01, 2004, 10:42:44 AM by Victor »
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RogerAS

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Re: will this work?
« Reply #2 on: July 01, 2004, 11:12:17 AM »
Hi,


Despite what I've read I think these will work, maybe not as well as purpose build turbine blades, but just maybe well enough.


I use box fan blades, so much smaller than what you have it aint funny. However these turn small stepper motors, so I don't see why these wouldn't spin a biggie.


RogerAS

« Last Edit: July 01, 2004, 11:12:17 AM by RogerAS »
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Norm

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Re: will this work?
« Reply #3 on: July 01, 2004, 11:45:18 AM »
   It'll work well enough.You won't have to worry about overrev and high winds throwing blades.

   I remember Ed from windstuffnow talking about making a simple brake combined with a lever and spring to measure the output, after you've determined how many ft/lbs per min ...then build or get a alternator/generator to closely match.

            Have Fun!j

              ( :>) Norm.
« Last Edit: July 01, 2004, 11:45:18 AM by Norm »
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BT Humble

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Re: will this work?
« Reply #4 on: July 01, 2004, 04:51:57 PM »
Do you have some pictures?  I suspect that you might have to modify the hub to make them work properly.  Remember that you want the flat side of the airfoil to face into the wind.


For a good intoduction to wind generator blade designs have a look at Hugh's booklet here:


http://homepages.enterprise.net/hugh0piggott/download/windrotord.pdf


BTH

« Last Edit: July 01, 2004, 04:51:57 PM by BT Humble »
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RobC

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Re: will this work?
« Reply #5 on: July 01, 2004, 08:37:43 PM »
Can you cut them loose and bolt them to a new hub? If you can I think they would work great.RobC
« Last Edit: July 01, 2004, 08:37:43 PM by RobC »
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Ungrounded Lightning Rod

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Re: will this work?
« Reply #6 on: July 01, 2004, 09:05:40 PM »
Can you cut them loose and bolt them to a new hub? If you can I think they would work great.RobC


Why not just turn the whole thing around?

« Last Edit: July 01, 2004, 09:05:40 PM by Ungrounded Lightning Rod »
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silverbug

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Re: will this work?
« Reply #7 on: July 01, 2004, 09:18:11 PM »
If I can figure out how to insert photos, I will provide photos sometime next week.

Today is the start of Canada Day long weekend and I will be in another province.


I only have 2 of the 4 blades and no hub.


I will have to make my own hub. It looks like it will be easy to adjust the pitch of the blades.


see you next week

« Last Edit: July 01, 2004, 09:18:11 PM by silverbug »
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silverbug

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Re: will this work?
« Reply #8 on: July 02, 2004, 06:16:09 AM »
I will provide some photos next week, when I have more time. Out of town for a holiday.


I dont have the hub.

« Last Edit: July 02, 2004, 06:16:09 AM by silverbug »
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RobC

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Re: will this work?
« Reply #9 on: July 02, 2004, 08:06:48 AM »
If the airfoil on the blades is not a true airfoil but just a curve then you can just turn then around. But if they are a true airfoil shape thicker in the front tapering to the back ( Clark Y style )then turning them around won't work very well because you will be run the airflow over the airfoil backwards and the only solution is to reverse the pitch. RobC
« Last Edit: July 02, 2004, 08:06:48 AM by RobC »
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silverbug

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Re: will this work?
« Reply #10 on: July 07, 2004, 04:56:51 PM »
I hope the photos work.



« Last Edit: July 07, 2004, 04:56:51 PM by silverbug »
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hvirtane

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Re: will this work?
« Reply #11 on: July 18, 2004, 02:23:06 PM »
Hi,


I think that they look good.


You might put your pictures on

a new story, because this thread

is now so far behind others.


What kind of generator are you going

to use with the blades?


- Hannu

« Last Edit: July 18, 2004, 02:23:06 PM by hvirtane »
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