Physics of Windmills - Get Info & References

[brucephy]

hi every physics guy
i have a project about windmill and i would like to get a lot of information about that.
Can anyone give me some reference.
Thankyou :!)

 

[Danger]

It would be helpful if you specify what sort you are interested in and whether you are writing a report, building a model, or building a full-scale working device. You can probably get a pretty good start here.

 

[brucephy]

i know there are so many types of windmill
and they all have their specific advantages and suitable application.
But i can't find the detail about that. )o(
can anyone help me ??

 

[Danger]

i know there are so many types of windmill
and they all have their specific advantages and suitable application.
But i can't find the detail about that. )o(
can anyone help me ??

If you mean that you need to determine what type you need to suit a particular application, you can probably best determine it by comparing fan or propellor properties from aerodynamics. A windmill is just a fan in reverse. For instance, large highly angled blades (paddles) will give more torque at lower speed which is what the Dutch style requires to run heavy mechanical equipment. Smaller, flatter, more numerous ones (turbines) give high speed with little torque, as you find running alternators on some farms. There are also vertical turbines such as are used on some 'wind farms'. They are more like helicopter rotors set on end. Medium speed and torque, but very high efficiency. Height above the ground and placement relative to other physical objects also matter, because it should be in the highest average airflow.

 

[brucephy]

Really thank you for your help
but i would like to have some picture about their stucture
Do you where can i find that ??
THanks for your kind attention

 

[Danger]

You're welcome. I don't know where to find anything more detailed on windmills themselves just off the top of my head. My time's a bit limited, but I'll try to find something and get back to you. In the meantime, quark kindly supplied the following in regard to fans in a previous thread. Hope it helps.

The flowrate across a fan depends upon the fan speed and the primemover should have enough power to move the air. You can use affinity laws of fan.
Q1/Q2 = N1/N2, H1/H2 = (N1/N2)^2 and P1/P2 = (N1/N2)^3, where Q is flowrate, H is head developed and P is power. When flowrate is high, the primemover develops power till it gets overloaded and trips off.

http://www.tcf.com/TCFBlower/literature.htm#bul
The above link provides you basic and detailed knowledge on fans.

 

[balasp89]

Hi, Can anyone help me to design a vertical axis windmill...

 

[Bob S]

There are two basic types of vertical-axis machines (VAWTs); Darrieus and Savonius. See
http://www.awea.org/faq/vawt.html
Some (Darrieus) are not self-starting, like the horizontal axis HAWTs.
Bob S

 

[balasp89]

Really thank u for ur attention... I want to know more about Drag type VAWT, about its blade design, various loads acting on those blades...