Author Topic: VAWT fiddling started...  (Read 11451 times)

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ghurd

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Re: VAWT fiddling started...
« Reply #33 on: October 06, 2007, 03:48:44 PM »
The Sandia thing?  This isn't perfect.

The bottles of $20 a pint shampoo and $20 a pint conditioner my teenage daughter thinks she has to have are better matched to the Sandia specs, but too tiny to count.


What I was thinking for the new square buckets,

The bucket from above, the cuts, and a pair of VAWTs from 1 bucket, that probably won't work if I do it. (my VAWT luck has been less than impressive)

Use your imagination to lay this over his end profile.



« Last Edit: October 06, 2007, 03:48:44 PM by ghurd »
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TomW

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Re: VAWT fiddling started...
« Reply #34 on: October 06, 2007, 04:12:43 PM »
G-;


Hey, neat use of on hand parts! $20 a pint hair care products. Jeeze. Stepdaughter here is same way but lives elsewhere on her own dime so not my problem.


We get strawberry buckets occasionally from a bakery that are square tubs but a bit wider at top than bottom. Might be another source. They are 5 gallon white plastic usually. Don't have any around just now but if I see one I will get a picture.


Just remembered, I have a few of WindStuff Eds educational turbine kits here I never got to use for the class I gave after I had the heart attack. Might have to join this vawt craze and get them assembled and running.


Cheers.


TomW


Cheers.


TomW

« Last Edit: October 06, 2007, 04:12:43 PM by TomW »

ghurd

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Re: VAWT fiddling started...
« Reply #35 on: October 06, 2007, 05:04:14 PM »
Hey TomW,

This particular step-kid has money to burn.

Her "mother's" checking account is apparently bottomless.  Step-dad will work 32 hours a day to replenish it.  The money spent on her college education doesn't count. Her bio-dad's $5/day support really helped, before she turned 18 and before she started college. He plans on suppling a little money during her college.

Ha-Ha!  I crack myself up.

Maybe that's just how it looks from here.


I spend much time each day sitting, planning, and looking at the bottles on the bathtub. Nuff said about that situation.


I figure to split the difference on the gap (top/bottom) difference.  

Something like the spiral / helical VAWT designs.  Too much something in one place evens out too little of it in another place.

Too narrow at the top means too wide at the bottom?  Self balancing?


Ed's minigen might be perfect for this?  Low power, low RPM, but needs torque to get it going.

Not sure the educational turbine kits will get enough RPMs with this kind of blade.


Everybody should study those bottles on the bathtub tomorrow morning, shortly after the second cup of coffee.

G-

« Last Edit: October 06, 2007, 05:04:14 PM by ghurd »
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DamonHD

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Re: VAWT fiddling started...
« Reply #36 on: October 07, 2007, 02:17:58 AM »
Thanks!


I hadn't thought of doing two levels...


Maybe I'll start with one level first.


Handily, my plastic bottle has indentations about 1/3rd of the way along each side just begging to be made into cuts.


Is there an 'optimal' opening size for the 'cup' or indeed between the parallel long parts?


I've found Sandia's VAWT papers but is there one in particular that covers this so I can give it a better read?


Rgds


Damon

« Last Edit: October 07, 2007, 02:17:58 AM by DamonHD »
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ghurd

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Re: VAWT fiddling started...
« Reply #37 on: October 07, 2007, 09:52:19 AM »
They had a sketch showing ratios. Lengths, gaps, radius, etc.

My plan is to start with the radius and work from there.

My luck finding specific items on their site is not so good, but it's in there somewhere.


I have a paper copy somewhere. I'll see if I can find it tomorrow.

G-

« Last Edit: October 07, 2007, 09:52:19 AM by ghurd »
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DamonHD

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Re: VAWT fiddling started...
« Reply #38 on: October 07, 2007, 10:03:27 AM »
OK, I may postpone my hacksawing until then!  My over-the-top PM gen for experiments should arrive tomorrow sometime...


As a vague handwaving suggestion, what fraction of the radius should be the open cup do you think (without the parallel long-piece covering it)?  10%, 30%, 70%?


You seem to be clear on that diagram that there is no straight-through central air gap, but that there is space for air to flow sideways from the catching cup between the overlapping long sections, if I have understood correctly.


I may go and have another look, when I'm feeling patient.  (I'm feeling cranky right now because I managed to delete ALL my stats data so far while trying to put in place a backup system for it.  Grrrrrrr.)


Rgds


Damon

« Last Edit: October 07, 2007, 10:03:27 AM by DamonHD »
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DamonHD

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Re: VAWT fiddling started...
« Reply #39 on: October 07, 2007, 11:01:21 AM »
I think the report I need is the SAND76-0131 "WIND TUNNEL PERFORMANCE DATA FOR TWO- AND THREE-BUCKET SAVONIUS ROTORS" but at the moment I'm only able to get at the abstract...


Rgds


Damon

« Last Edit: October 07, 2007, 11:01:21 AM by DamonHD »
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DamonHD

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Re: VAWT fiddling started...
« Reply #40 on: October 07, 2007, 11:20:52 AM »
OK, the wonder of Google pulled up the full version of that Sandia paper, but I also came across this:


http://www.fieldlines.com/story/2004/4/20/122735/478


Rgds


Damon

« Last Edit: October 07, 2007, 11:20:52 AM by DamonHD »
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ghurd

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Re: VAWT fiddling started...
« Reply #41 on: October 07, 2007, 11:29:09 AM »
That's the one!


Those crazy square dots in the center were just for a reference point.

Not sure what I did to the size of that sketch, but at least it's only 1.8K. :-)

G-

« Last Edit: October 07, 2007, 11:29:09 AM by ghurd »
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DamonHD

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Re: VAWT fiddling started...
« Reply #42 on: June 18, 2017, 05:01:12 PM »
Rave from the grave!

Was just refreshing this page of mine:

http://www.earth.org.uk/VAWT-experiment3-scanner-box-and-real-PM.html

and repaired the FL link to point at this thread (well, I think it's this one!).

Rgds

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SparWeb

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Re: VAWT fiddling started...
« Reply #43 on: June 18, 2017, 06:42:36 PM »
Wow that goes wayyy back.
Back then, they didn't have terms like "upcycling" for cereal boxes.  :)
No one believes the theory except the one who developed it. Everyone believes the experiment except the one who ran it.
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