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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 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 8:39 PM, Julien Winter
wrote:<br>
</div>
<blockquote
cite="mid:CALv4xTxyxYZoVsdhaLafN2zpC7AYp5nQ5B4U-Uxz2q4rOM1M5A@mail.gmail.com"
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<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>
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<div dir="ltr">Julien Winter<br>
Cobourg, ON, CANADA<br>
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<br>
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