[Stoves] diy TLUD flame

[Paul Anderson]

Dear revjcsd,       (sorry I do not recognize your real name or 
location/background),

The long tail is because to the time (and space) needed for O2 in air to 
mix with the combustible gases (I am repeating what is widely known).    
Increased turbulence is the answer, and that is possible in TLUDs that 
have forced air.

The rice hull TLUDs can (gently) force the primary air and therefore the 
gases, making them go through _relatively small_ openings such as on the 
"Belonio burner" that is also well used by Paul Olivier.

Alternatively, forced SECONDARY air can increase the turbulence by use 
of _smallish holes_ injecting the air into the rising combustible gases, 
as in the Reed Woodgas Campstove (produced since 2003).

But for ND (natural draft) TLUDs, the simple "pulling" of the air (by 
negative pressure) makes it difficult to impact both the secondary and 
primary air to get the desired result of turbulence because if the 
openings/holes are reduced in size, the flow is reduced.

One ND solution is to have a sufficient (1 to 3 meter) chimney to create 
significant negative pressure AND at the same time be able to cut back 
the primary air, causing the negative pressure to be available for the 
secondary air to be pulled in with sufficient force and causing 
turbulance.     (I learned this from John Davies in South Africa in 2002).

Bjarne Laustsen in Tanzania has a set of fins to create as swill to 
increase turbulence.

This has probably been said many other places and better, but I did not 
know where to refer you to get the answer.    And others can refine what 
I have written.

Paul

Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  psanders at ilstu.edu
Skype: paultlud      Phone: +1-309-452-7072
Website:  www.drtlud.com

On 2/25/2014 11:31 PM, revjcsd at juno.com wrote:
> Is there a discussion on how to control DIY TLUD's flame somewhere in the archive? Or elsewhere?
>
> Other than the Belonio-Olivier burner, I have yet to see a TLUD without the long tail of flame.
>
> Thanks.
>
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