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Alex,<br>
<br>
If there is a spectrum of TLUD operations (and I agree that there
probably is), then we should be able to identify a few other points
in the spectrum and (I hope) identify what allows the blue flame and
what does not.<br>
<br>
Examples that are at the blue-flame end are more interesting and
fewer than the more standard TLUD operations with the yellow flames.<br>
<br>
What could you do with your set-up to illustrate better that
spectrum and especially for replication of the blue flame results.<br>
<br>
About the mixing pattern of the blue flame, I thought of "upwelling"
(or sort of like the "rolling of water and clothes in an upright
washing machine. What is your word?<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 10/2/2016 1:14 PM, alex english
wrote:<br>
</div>
<blockquote
cite="mid:CA+6hwOoQFSu7q4QkBMBYiy4uAWBTDo6Z0xNbunAyipviPER1ig@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>Listers,</div>
<div>This follows from previous comments on this topic.</div>
<div><br>
</div>
<div>So testing the so called premix burner with different TLUD
fuel condition yielded a very different result.</div>
<div><br>
</div>
<div>Using a 5.5 inch inside diameter pipe, 7.5 inches tall as a
fuel chamber.<br>
</div>
<div><a moz-do-not-send="true"
href="https://goo.gl/photos/kMhkJUTaSvHYsA7T9">https://goo.gl/photos/kMhkJUTaSvHYsA7T9</a></div>
<div><br>
</div>
<div>With the same burner assembly;</div>
<div><a moz-do-not-send="true"
href="https://goo.gl/photos/JYP5jDTkNqKvZK9h9">https://goo.gl/photos/JYP5jDTkNqKvZK9h9</a><br>
</div>
<div><br>
</div>
<div>With 5 or 6 inches of wood pellet depth it burned for
roughly 50 minutes. </div>
<div><br>
</div>
<div>Here is a video of the flame;</div>
<div><a moz-do-not-send="true"
href="https://www.youtube.com/watch?v=71mt-wUHadc&feature=youtu.be">https://www.youtube.com/watch?v=71mt-wUHadc&feature=youtu.be</a><br>
</div>
<div><br>
</div>
<div>The primary under fuel air was not limited, Particles are
entrained in the gas, showing up as sparks. The temperature in
the reaction zone is likely 800C or more. This is a guess
based on data from past experience. The flame speed appears to
be faster and attaches low in the burner, just after the
secondary air, with essentially little or no premixing. I
think this condition and the previous one with the blue flame
represent two ends of a spectrum for natural draft tluds.</div>
<div><br>
</div>
<div>I have seen some conflicting evidence about gas species
from gasification and pyrolysis of wood at different
temperatures. It is likely that there is more C02 at the lower
superficial velocity/temperature condition. That might be
sufficient to lower flame speed. The same for the lower
hydrogen content.?? I have flame speeds for many gasses. Any
references or theories about the what is burning here??</div>
<div><br>
</div>
<div>Looking closely at the blue flame video I think I see
mixing pattern with a name. Without my providing the name, I
would like to know what other people see. Hint it isn't
"vortex".</div>
<div>Alex</div>
</div>
<br>
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