Re: Problems of Scale with Scale Models

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Re: Problems of Scale with Scale Models mirentwo 03-10-2008
Posted by mirentwo on March 10, 2008, 7:06 pm
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HI!I am doing my proyect and is about wind turbines. I have to desing an
aerodynamic wind turbine. Is NACA 4418. I would like to know if you Know
wich is the best angle of atacc for those type of airfoils, ecause I
have been searching information and i cant found it.
thank you


--
mirentwo
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Posted by Trevor Jones on March 10, 2008, 10:38 pm
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 mirentwo wrote:

> HI!I am doing my proyect and is about wind turbines. I have to desing an
> aerodynamic wind turbine. Is NACA 4418. I would like to know if you Know
> wich is the best angle of atacc for those type of airfoils, ecause I
> have been searching information and i cant found it.
> thank you
>
>

Is it homework season again already?

I thought that the idea of a project like that was to do your own
research, rather than mooch it off others.


Posted by Steve R. on March 11, 2008, 3:19 am
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> mirentwo wrote:
>
>> HI!I am doing my proyect and is about wind turbines. I have to desing an
>> aerodynamic wind turbine. Is NACA 4418. I would like to know if you Know
>> wich is the best angle of atacc for those type of airfoils, ecause I
>> have been searching information and i cant found it.
>> thank you
>>
>>
>
> Is it homework season again already?
>
> I thought that the idea of a project like that was to do your own
> research, rather than mooch it off others.
>

He should find a good text on aerodynamics.

A good English as a second language course might help him to spell, and
construct a coherent sentence.

Steve R.




Posted by Richard on March 11, 2008, 10:40 am
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wrote:

>mirentwo wrote:
>
>> HI!I am doing my proyect and is about wind turbines. I have to desing an
>> aerodynamic wind turbine. Is NACA 4418. I would like to know if you Know
>> wich is the best angle of atacc for those type of airfoils, ecause I
>> have been searching information and i cant found it.
>> thank you
>

This is a (very) large subject and there isn't 'an' answer. As with
most things there are a heap of trade-offs. For some fairly serious
reading I would suggest either of these:
The Theory of Flight by Richard von Mises or Theory of Wing Sections
by Abbott & Doenhoff.
I'm not sure what 'level' you're at, but the fact that whoever has set
the question has specified a blade section seems to suggest that you
should be able to cope with reasonably technical text. Get a
dictionary and learn how to use it!

As a quick comment and given that you have been specified a wing
(blade) section, you need a set of 'polars' for that section so you
can assess it's characteristics at different Re's (ie wind speed in
conjunction with the blade cord). If you email me off list I can
provide an un-certified plot for you.

As a very broad rule of thumb, you can expect to be working at an AoA
of not more than around 10 degs. and expect a stall at around 15 degs.
This is NOT _the_ answer!!

Richard

Posted by Chris Holford on March 11, 2008, 12:54 pm
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>wrote:
>
>>mirentwo wrote:
>>
>>> HI!I am doing my proyect and is about wind turbines. I have to desing an
>>> aerodynamic wind turbine. Is NACA 4418. I would like to know if you Know
>>> wich is the best angle of atacc for those type of airfoils, ecause I
>>> have been searching information and i cant found it.
>>> thank you
>>
>
Martin Heperle's pages http://www.mh-aerotools.de/airfoils/windmill.htm
have a lot of relevant stuff.
--
Chris Holford

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