Now my torkmaster is flying I was thinking of doing
something usefull.
I said:"Torkmaster,without data you're nothing"
Well, gennies is nice but electricity is
invisible and you can't see what's going on.
So I decided to stir water and mesure t°rise.Lucky I didn't
get there,I would have been disapointed.A few watts in a bucked
of water would have been difficult to mesure.
I had a sudden flash when I saw a picture of the dans
with a genny on a balance:
the PADDLEWHEEL VAWT DYNAMOMETER
I started with the balance.I consider this part
high tec because there is a rollerskate bearing in it.
The 15l paint drum contains water that's stirred by an impeller on the axe of a vawt
I put mes on the inner surface to increase friction of the water
This is the impeller.I made the holes in an (infructuous) attempt
to improve performance
after disapointing results I dicided to change the impeller/stator
configuration.I baked some pieces iron together to make this:
calibration
The funny thing about this dynameter is that it's suspended
the chains that's hanging on is the bearings.
The balance goes to 3 newton
Of course I can easily modify and recalibrate my balance to what I want
but 3 N was enough for the paddlewheel.
This is one of the topreadings at about 100-120 rpm,wind about 45km/h
The diam of the drum is about 30 cm.
A few days ago I estimated 6watt.To lazy to verify.
In the book of gary Johnson is a small chapter about the
paddlewheel with an awesome formula.My improved stator/rotor
gives some better results than the formula would say.But
still it is much to small to make a good load.
Have to scale it up ...if I do.
cheers,
stonebrain
|
|
|
Total Views
|
|
122 Scoop users have viewed this posting.
|
|
