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Dean,<br>
<br>
Good observation. I am not sure how much flicker is produced in
Julien'a arrangement.<br>
<br>
About the Firefly, I re-watched the 2 videos. The night video
shows the steady flame while inside the "lense" (glass riser).
Flame movement is seen above the pot rests. If there was another
glass riser placed there, the flame would be steady for even a
greater distance. If the additional upper riser was of a
sufficiently different diameter than the current riser/lense, it
would also be able to be stored by concentric insertions of
cylinders. <br>
<br>
Best wishes for success with the Firefly product.<br>
<br>
Paul <br>
<pre class="moz-signature" cols="72">Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: <a class="moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a>
Skype: paultlud Phone: +1-309-452-7072
Website: <a class="moz-txt-link-abbreviated" href="http://www.drtlud.com">www.drtlud.com</a></pre>
<div class="moz-cite-prefix">On 8/17/2015 10:30 PM, Dean Still
wrote:<br>
</div>
<blockquote
cite="mid:CA+tShZu7wTuxYMzixxfn5HmTKnV97qmu0J6-bmnXoszkdXk0gQ@mail.gmail.com"
type="cite">
<div dir="ltr">Hi Paul,
<div><br>
</div>
<div>Swirl would look great in a TLUD lantern. But we tried to
have no flicker so the light for reading would be steady. We
wanted a steady column of flame.</div>
<div><br>
</div>
<div>See: <a moz-do-not-send="true"
href="https://stovetecstore.net/product/firefly-lantern-dual-biomass-lanterncookstove/">https://stovetecstore.net/product/firefly-lantern-dual-biomass-lanterncookstove/</a></div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>Dean</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Mon, Aug 17, 2015 at 7:10 PM, Paul
Anderson <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> Julien,<br>
<br>
You do nice work!! <br>
<br>
There can be at least one advantageous use of the tall
ambient swirl, and that is to make a woodgas lantern with
a tall, bright yellow flame inside an appropriate glass
cylinder (such as for kerosene or gas lamps). And in
such a device, there is not much purpose in turning down
to a low flame, so the problem of flame extinguishing is
not an issue.<br>
<br>
The concept of a tall flame to give light is not new.
But you are identifying an improved way to make the flame
tall and bright.<br>
<br>
I hope that you can enlighten us further!!!!!!!!!<br>
<br>
Paul<br>
<pre cols="72">Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: <a moz-do-not-send="true" href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>
Skype: paultlud Phone: <a moz-do-not-send="true" href="tel:%2B1-309-452-7072" value="+13094527072" target="_blank">+1-309-452-7072</a>
Website: <a moz-do-not-send="true" href="http://www.drtlud.com" target="_blank">www.drtlud.com</a></pre>
<div>On 8/17/2015 8:39 PM, Julien Winter wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Hello all;</div>
<div><br>
</div>
<div>Not all swirls are created equal. Kirk has
created a swirl high up in the flame to improve the
final mixing of reactants and get a clean burnout.</div>
<div><br>
</div>
<div>Another kind of swirl is caused by an ambient
swirl in the secondary air. This starts a rotation
in the flame right at its base. The result in
nature is called a fire whirl or fire tornado. In
this case, gases move to the middle,
and vertically 'stretch out the flow lines' into a
slow spiral with a flow that is more laminar than
turbulent. The result is a taller flame. There
are some good YouTube vids of this phenomenon.</div>
<div><br>
</div>
<div>I did some experiments on ambient swirls last
year, and doubled the height of the gas flame. That
wasn't exactly what I wanted. I also found that a
swirling flame was more prone to go out at low
gasification rates than a non swirling flame.</div>
<div><br>
</div>
<div>I have attached a couple of photographs of my
gear. I had some collars with vanes that fitted
over the outside of tin can risers with holes for
secondary air. I could modify the ambient swirl by
changing the angle of the vanes. In another burner,
I had a slit up the side of the riser as well.</div>
<div><br>
</div>
<div>A little ambient swirl can be useful to keep the
flame from running up the side walls of the riser,
and to encourage secondary air to move toward the
center of the burner, but I am not a big fan of a
strong ambient swirl, unless something can be done
to create turbulence.</div>
<div><br>
</div>
<div>Cheers,</div>
<div>Julien.<br clear="all">
<br>
-- <br>
</div>
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">Julien Winter<br>
Cobourg, ON, CANADA<br>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
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-- <br>
<div class="gmail_signature">
<div dir="ltr">
<div>
<div>Dean Still</div>
<div dir="ltr">Executive Director
<div>Aprovecho Research Center</div>
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