Wind Energy - Small Wind Turbine Design Notes.pdf
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Small Wind Turbine Design Notes
Notes based on a session during the Centre for Alternative Technology Windpower Course
Notes written and taught by Hugh Piggott with input from Claus Nybroe.
Hugh Piggott writes:
The first time I did this talk at CAT they threw me in with no preparation, "Just come as you are!"
and I had to wave my arms about a lot. Since then I have done it countless times, but I still get more
than a few blank looks. It's probably the most obscure bit of the course. Finally after about ten
years, I have produced a full set of notes. I am so pleased, I asked Ian to put it on his site, and he
has! Thanks Ian. Sorry I did not explain Betz's theorem, or 'tip speed ratio'. Buy my book
'Windpower Workshop' and read the whole story :)
Content
Defining drag vs lift forces
page 2
Finite element blade design
page 3
The maths of lift and drag
page 4
Setting the best blade angle
page 5
Shape of the apparent wind
page 6
Optimising the chord width
page 7
'Back of an envelope' design
page 8
Factors affecting power coefficient
page 9
Ideal shapes and practical limits
page 10
Pros and cons of high speed rotors
page 11
Variation of size and twist windmill blade
page 12
Defining drag vs lift forces
Finite element blade design
The maths of lift and drag
Setting the best blade angle
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