wind turbine blade design
wind turbine blade design
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wind turbine blade design Frequently Asked Questions
How do you calculate swept area of savonius turbine?
I am trying to calculate a power of a Savonius wind turbine. According to the formula which I am going to use
Power AVAILABLE in the wind = .5 x air density x swept area x (wind velocity cubed)
Even though I am using this formula. I am bit confused because I am using three blades on my design and There might be at lest 1 blade which will be rotating opposite to wind direction. I think this formula lacks the opposite force aswell. Could anyone please correct me am I using the right formula too?? Thanks
Each wind turbine design has a power coefficient that demonstrates that maximum power available in that particular design (See Betz limit, 0.59,of a wind turbine to know a little more of what I'm talking about). A Savonius wind turbine's power coefficient is approximately 0.15, which is the lowest of all wind rotor designs.
Firstly, you are using the right equation. The amount of blades used in the design has no effect on the swept area, so don't worry about that. Its just the area that the blades will pass through while rotating, typically a circular area. The power coefficient will factor in the blade moving in the opposite direction.
After performing the above calculation, multiple that value by 0.15 to determine the MAXIMUM AVAILABLE power. This value does not include any loses associated with the gearing, structure, etc. It will be the ideal number that you cannot realistically obtain.
Overall, you are using the right equation but you need to incorporate the power coefficient. I have a graph of all the wind rotor designs that I wish I could post here. Hope this helps!
Would you buy a wind turbine kit ?
If I provided a basic kit - Magnets, wire, plastic and aluminium formers, spacers, bearings and hub - Enough to make a working turbine - would anyone buy it?
The theory is to make a basic model available in kit form, that anyone can build and produce real power. There will be a choice of blades that will all fit the hub, but it will be designed to be an easily adaptable platform for modification.
It will also be designed to be upgraded - by adding more elements to increase power output.
It would provide both a learning experience, and a working model as a result for your cash.
By doing it this way, the cost is kept to a minimum, as there is no assembly costs - only simple packaging.
What do you think.
Just to point out, in most "kits" - the generator unit is pre - assembled, and not particularly efficient. My design is more efficient, and more importantly, is upgradable and easily repairable by the user. This kit is for home-assembly of the generator itself.
Yeah, I would buy that, especially if it was at least powerful enough to do something useful, like power outdoor lights or charge a battery kit.
I'd like the turbine bit to be self-assembly more than the generator. I like lego and ikea. I'm not an electrician. The instructions would have to be really good. And the price would have to be quite reasonable - low enough that the money you save on electricity over, say, fifteen years, would cover the cost. If not, you would have to market it as an educational product.
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