[Stoves] Request to get partners in a possible TLUD stove improvement project

[Dean Still]

Hi Paul,

Swirl would look great in a TLUD lantern. But we tried to have no flicker
so the light for reading would be steady. We wanted a steady column of
flame.

See:
https://stovetecstore.net/product/firefly-lantern-dual-biomass-lanterncookstove/

Best,

Dean

On Mon, Aug 17, 2015 at 7:10 PM, Paul Anderson <psanders at ilstu.edu> wrote:

> Julien,
>
> You do nice work!!
>
> There can be at least one advantageous use of the tall ambient swirl, and
> that is to make a woodgas lantern with a tall, bright yellow flame inside
> an appropriate glass cylinder (such as for kerosene or gas lamps).   And in
> such a device, there is not much purpose in turning down to a low flame, so
> the problem of flame extinguishing is not an issue.
>
> The concept of a tall flame to give light is not new.   But you are
> identifying an improved way to make the flame tall and bright.
>
> I hope that you can enlighten us further!!!!!!!!!
>
> 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 8/17/2015 8:39 PM, Julien Winter wrote:
>
> Hello all;
>
> Not all swirls are created equal.  Kirk has created a swirl high up in the
> flame to improve the final mixing of reactants and get a clean burnout.
>
> Another kind of swirl is caused by an ambient swirl in the secondary air.
> This starts a rotation in the flame right at its base.  The result in
> nature is called a fire whirl or fire tornado.  In this case, gases move to
> the middle, and vertically 'stretch out the flow lines' into a slow spiral
> with a flow that  is more laminar than turbulent.   The result is a taller
> flame.   There are some good YouTube vids of this phenomenon.
>
> I did some experiments on ambient swirls last year, and doubled the height
> of the gas flame.  That wasn't exactly what I wanted.  I also found that a
> swirling flame was more prone to go out at low gasification rates than a
> non swirling flame.
>
> I have attached a couple of photographs of my gear.  I had some collars
> with vanes that fitted over the outside of tin can risers with holes for
> secondary air.  I could modify the ambient swirl by changing the angle of
> the vanes.  In another burner, I had a slit up the side of the riser as
> well.
>
> A little ambient swirl can be useful to keep the flame from running up the
> side walls of the riser, and to encourage secondary air to move toward the
> center of the burner, but I am not a big fan of a strong ambient swirl,
> unless something can be done to create turbulence.
>
> Cheers,
> Julien.
>
> --
> Julien Winter
> Cobourg, ON, CANADA
>
>
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-- 
Dean Still
Executive Director
Aprovecho Research Center
PO Box 1175
76132 Blue Mountain School Road
Cottage Grove, OR 97424
(541) 767-0287
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