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My farewell to fluidynes - Page 7

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Posted by Curbie on May 29, 2011, 10:13 am
 
Morris,

Here's a moving GIF for one of Nasa's "Linear Stirling" Generators, I
don't know if it will be of any use or interest to you, it is very
interesting in that it is a resonance machine, very tricky math.

http://i825.photobucket.com/albums/zz177/Curbie_Pics/LinearGeneratorStirling.gif

Curbie



Posted by Morris Dovey on May 29, 2011, 1:00 pm
 
On 5/29/11 5:13 AM, Curbie wrote:


http://i825.photobucket.com/albums/zz177/Curbie_Pics/LinearGeneratorStirling.gif

It is interesting to me - but the design appears too expensive (and I'd
guess too short-lived) for any of my projects.

The animation appears to show energy being lost to overcome spring force
at all four of the support points - which makes me wonder if efficiency
is a concern.

Do you recall the intended use?

--
Morris Dovey
DeSoto Solar
http://www.iedu.com/DeSoto/

Posted by Curbie on May 29, 2011, 1:48 pm
 Morris,


IIRC, that design was aboard a space vehicle, but the point of posting
it was to see if you could find something of use with your work from a
proven design, IIRC, the device was less than 12" long and produced 55
watts.

I think that image came from
http://www.grc.nasa.gov/WWW/TECB/stirling.html
… sometime in 2007, but the link is now 404.

Digging around in my stirling folder I also have a Preliminary Schmidt
Analysis Spreadsheet for V-2 Alpha Stirling ( Rider ) Engine, which is
pretty interesting, if you want it.

Also a sheet to Calculate theoretical "in cylinder" temperature rise
of air due to compression.

Curbie



Posted by Morris Dovey on May 29, 2011, 3:41 pm
 On 5/29/11 8:48 AM, Curbie wrote:

I'm maintaining a focus on solar-powered devices that can be produced in
a low-tech environment - produced at a much lower technology level than
what's needed to develop the underlying designs. That's a fairly
stringent constraint.

I'm also working under some pretty tight budgetary constraints - my R&D
resources are limited to what remains of a Social Security pension after
all the bills are paid (everybody's tax dollars at work) and, for the
end users, what a typical third-world farmer can afford to invest in a
new piece of equipment. There's not much "wiggle room" at either end.

With my present (non-electric) solar approach there will be somewhere
near 2 kW worth of input energy - and my (non-trivial) challenge to
myself is to realize at least 1 hp (746 W) at the output side.


I've often wished that NASA would make old pages/images available in a
public access archive. I've bookmarked a link to your gif on photobucket.


At this point I'm staying away from what I think of as "air" engines
because they appear (generally) to be either too limited in capability,
too inefficient, and/or too expensive - but thank you for your offers.

--
Morris Dovey
DeSoto Solar
http://www.iedu.com/DeSoto/

Posted by Winston on May 29, 2011, 8:07 pm
 Morris Dovey wrote:

(...)


That lets thermo acoustics out; they are only 20 to 30 percent
efficient. 400 to 600 W out. (Yes, more loss in the 'generator'
portion.  :)

http://en.wikipedia.org/wiki/Thermoacoustic_hot_air_engine#Efficiency

--Winston

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