[Stoves] Trials on TLUD gas burners + central cylinder

[Paul Anderson]

Julien,    [And of interest to all TLUD stovers.]

Very nice experiment.   There are several variables to consider:

1.  Increase the diameter of the central buffer cylinder

2.  As the buffer cylinder gets wider, it will need to be raised 
slightly from the concentrator hold.

3.  The buffer cylinder might be shorter (not up to the top of the 
riser, ie., the internal chimney that is below the pot).   That would 
allow the Venturi Effect to cause swirling back into the center of the 
riser.

4.  Variations in the holes for the entry of the secondary air, such as 
smaller but more numerous, or with deflectors to cause the air to enter 
at different angles.   [ This is a bit more work because it requires 
making other "burners"/risers.    It is good that the main material is a 
common-size tin can.  ]

5.  There is also the issue of the ConcAbove that should not be totally 
discarded without further experimentation.   There is evidence that 
having SOME (unknown amount) secondary air entering the fuel chamber 
(that is, below the concentrator) helps maintain the needed heat and the 
flame, giving additional buoyancy (push or thrust) to get the 
combustible gases to exit upwards through the concentrator.

6.  Other variations that others can suggest.

At this early stage, it appears to me that the rectangular burner is not 
as likely to have good results as is the  ConcBelow design.  After a few 
more trials, it might be set aside.

Also, I hope that several others Stovers will join in and replicate and 
expand upon what Julien is doing.

I have also already discussed with Julien if he could attend the Stove 
Camp at Aprovecho on 21-25 July this year.   And even if he cannot, he 
and I will try to have the latest of the research about TLUD burner 
designs available at the Camp for some demonstrations and testing under 
the emissions hood.

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 5/5/2014 9:27 PM, Julien Winter wrote:
> Hi Stovers;
>
> At the suggestion of Paul Anderson, I ran single tests on the burner 
> with the concentrator below secondary air holes (ConcBelow), and 
> the discontinuous annular (Rectangular) burner.  In these tests I put 
> a 2.5 cm diameter cylinder in the center of the burners to direct 
> flamelets upwards in the chimney.
>
> A pdf is attached.  Photographic conditions were not ideal (nor was my 
> old camera), but good enough to see how the flamelets were affected.
>
> I can't say if the central cylinder was an improvement, because my 
> soot test was not that sensitive.  However, the central cylinder 
> didn't appear to increase soot production compared to having no 
> cylinder, nor did it slow down the rate of gasification.
>
> Future, more detailed experimentation could include a central cylinder 
> to see if it reduces the mass of soot produces, and increases the rate 
> of heat transfer to the pot.
>
> Cheers,
> Julien.
>
> -- 
> Julien Winter
> Cobourg, ON, CANADA
>
>
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