[Stoves] diy TLUD flame

[Crispin Pembert-Pigott]

Dear Tom’n’All

 

After who-knows-how-many experiments I have concluded that it is difficult, without a chimney, to get enough impetus into a gas stream in a domestic stove <5kW using max 125mm of draft to properly aerate more than 125mm in diameter. 

Whether that means the minimum draft needed above the secondary air entrance is the same as the diameter (as a design guide) I do not know. 

 

Because the viscosity of air is about the same under most conditions, it is possible that the ratio of 1:1 is not true for sizes that are quite different.

 

An option to consider for regulating the primary air supply is to have a down-drafting portion of the preheating to automatically provide a balanced supply. This has been done with the StOvs Cooker, the Vesto and the Vesto knock-off made of clay in Maputo. It has also been incorporated (though less detectably) in the Lion Stove and the Lioncub.

 

Regards
Crispin

 

 

Jock,

 

As you point out is it a mixing problem and there are different ways to solve it. The gap and plates work as long as there is enough energy for the air and producer gas to mix. Otherwise they can float along side by side without ever mixing, or just mixing poorly. John and Flip Anderson tried using ceramic plates to improve mixing and flow in a rocket stove. It seemed to work but after considerable testing they abandoned it.  

 

Tom

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20140226/b3297173/attachment.html>