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

Paul Anderson psanders at ilstu.edu
Mon Aug 17 21:10:59 CDT 2015


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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