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

[Paul Anderson]

Dean,

Good observation.   I am not sure how much flicker is produced in 
Julien'a arrangement.

About the Firefly, I re-watched the 2 videos.   The night video shows 
the steady flame while inside the "lense" (glass riser). Flame movement 
is seen above the pot rests.   If there was another glass riser placed 
there, the flame would be steady for even a greater distance.   If the 
additional upper riser was of a sufficiently different diameter than the 
current riser/lense, it would also be able to be stored by concentric 
insertions of cylinders.

Best wishes for success with the Firefly product.

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 10:30 PM, Dean Still wrote:
> 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 
> <mailto: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  <mailto:psanders at ilstu.edu>    
>     Skype: paultlud      Phone:+1-309-452-7072  <tel:%2B1-309-452-7072>
>     Website:www.drtlud.com  <http://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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>
>
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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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