[Stoves] Studies of pressure variations in a TLUD - Pulsing Flame with Concentrator Rings

[Crispin Pemberton-Pigott]

Perfect demo.

The cause is the level where the air enters.

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.

The gas accumulates there and burns back from above (very slightly) and once started, continues.

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.

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.

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.

The ignition source as a flamelet creeping up one side of the combustion chamber.

Regards
Crispin


From: Stoves <stoves-bounces at lists.bioenergylists.org> On Behalf Of Julien Winter
Sent: Thursday, June 18, 2020 19:27
To: Discussion of biomass cooking stoves <stoves at lists.bioenergylists.org>
Subject: [Stoves] Studies of pressure variations in a TLUD - Pulsing Flame with Concentrator Rings

Hi Folks;
I made another video so that you can see the relationship between above and below concentrator flames
https://youtu.be/0HBCHGQk1AU<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>
Cheers,
Julien

--
Julien Winter
Cobourg, ON, CANADA
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