<p dir="ltr">Dear all,</p>
<p dir="ltr">The Prime/UB stoves utilizes the pre-mixing mechanisms by altering the direction of secondary air against the smoke, in addition to the pre-heating of both primary and secondary air.</p>
<div class="gmail_extra"><br><div class="gmail_quote">On Oct 8, 2016 11:11 AM, "Paul Anderson" <<a href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Alex and all,<br>
<br>
This work on pre-mixing is, in my opinion, extremely important.
Many should participate.<br>
<br>
Paul<br>
<pre class="m_-832629968105847094moz-signature" cols="72">Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: <a class="m_-832629968105847094moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>
Skype: paultlud Phone: <a href="tel:%2B1-309-452-7072" value="+13094527072" target="_blank">+1-309-452-7072</a>
Website: <a class="m_-832629968105847094moz-txt-link-abbreviated" href="http://www.drtlud.com" target="_blank">www.drtlud.com</a></pre>
<div class="m_-832629968105847094moz-cite-prefix">On 10/7/2016 6:15 AM, alex english
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Paul,</div>
<div>You asked what I might be able to do to shed light on the
conditions for achieving a blue flame.</div>
<div><br>
</div>
<div>This week I followed the evidence. It was clear from
running a TLUD at higher temperatures that the flame behaved
differently than my original example. The flame speed of the
mix could attach at the point of secondary air entrance in a 2
inch pipe ( all measures are inside diameter). Reducing this
to 1.5 inches moved the flame up to the transition back to 2
inches. The flame speed was two slow for the higher speed in
the 1.5 inch pipe. However the 1.5 inch section was six inches
long and it was clear that the flame was not very well
premixed because of tall orangey tails extending from the
lower blueish portion. So a few increments of changes later
the burner now has 18 inch mixing tube between the secondary
air introduction and the point of flame attachment. It steps
down from 2 to1.5 to 1.25 and up again to 1.5 to 2 to 2.5
which is the cone that expands to 6 inches.</div>
<div><br>
</div>
<div>This is the result;</div>
<div><a href="https://www.youtube.com/watch?v=5sjOTHwDsWo" target="_blank">https://www.youtube.com/watch?<wbr>v=5sjOTHwDsWo</a><br>
</div>
<div><br>
</div>
<div><i>It is quite different than the origional slow
continuous blueming flame flower </i></div>
<div><i>Here again</i></div>
<div><i><a href="https://www.youtube.com/watch?v=jnV1e60NTss" target="_blank">https://www.youtube.com/watch?<wbr>v=jnV1e60NTss</a><br>
</i></div>
<div><i><br>
</i></div>
<div><i>There are a differences that are due to the fuel gasses,
the temperature of the gasses and perhaps the excess air
values. All play a role. </i></div>
<div><i>The much longer mixing tube changes the net draft as
well. Also I was unable to light the mix from the secondary
air entrance. Had to be lit top- down.</i></div>
<div><br>
</div>
<div>Here is a fun ignition shot. Talk about descending flame
fronts:)</div>
<a href="https://www.youtube.com/watch?v=X7JepJ1MdWg" target="_blank">https://www.youtube.com/watch?<wbr>v=X7JepJ1MdWg</a><br>
<div><br>
</div>
<div>You tube has a 'gear' icon in the lower right of the screen
where you can control the speed of the video replay (without
sound). It is informative to watch these at .25 speed. The
glowing meteor sparks show up better. Starting and stopping
the videos freeze them in there tracks. If one knew the frame
speed of the camera you could almost calculate the velocity of
the sparks by the length of their paths.</div>
<div><br>
</div>
<div>Sorry to interrupt the very interesting discussion of
charcoal.</div>
<div>Alex</div>
</div>
<br>
<fieldset class="m_-832629968105847094mimeAttachmentHeader"></fieldset>
<br>
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