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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Perfect demo.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">The cause is the level where the air enters.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">It got into people’s stoves sometime during the work of Paal Wendelbo that the secondary air could enter at the top of the chamber.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">The gas accumulates there and burns back from above (very slightly) and once started, continues.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">If you admit at least some of the air at the level of the fuel it should stop because the gas will burn as soon as it leaves the fuel.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">In the example stove there are two flames actually, one below the tube and one in and above the tube. The lower one is not burning all the gas and the upper one is.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">If you greatly extend the system vertically you should be able to get a machine gun. The blast burn above will push gas backwards and extinguish the flame (probably) and then it will fill up again.
This effect was noticed in Ulaanbaatar on the Turkish TLUD coal stoves that were (against recommendation and an advertising campaign) refuelled while hot. The “pop” was sufficient to blow the top off the stove and hurl flaming coals around the room.
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">The ignition source as a flamelet creeping up one side of the combustion chamber.
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Crispin<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Stoves <stoves-bounces@lists.bioenergylists.org>
<b>On Behalf Of </b>Julien Winter<br>
<b>Sent:</b> Thursday, June 18, 2020 19:27<br>
<b>To:</b> Discussion of biomass cooking stoves <stoves@lists.bioenergylists.org><br>
<b>Subject:</b> [Stoves] Studies of pressure variations in a TLUD - Pulsing Flame with Concentrator Rings<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Folks;<o:p></o:p></p>
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<p class="MsoNormal">I made another video so that you can see the relationship between above and below concentrator flames<o:p></o:p></p>
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<p class="MsoNormal"><a href="https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fyoutu.be%2F0HBCHGQk1AU&data=02%7C01%7C%7C8b60a9825f1b4e74550908d813df6570%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637281197479398032&sdata=Wc9kX8zd2i134lG5AXcxzJro0Dx891NgfL3sIAvkiZI%3D&reserved=0">https://youtu.be/0HBCHGQk1AU</a><o:p></o:p></p>
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<p class="MsoNormal">Cheers,<o:p></o:p></p>
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<p class="MsoNormal">Julien<o:p></o:p></p>
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-- <o:p></o:p></p>
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<p class="MsoNormal">Julien Winter<br>
Cobourg, ON, CANADA<o:p></o:p></p>
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