[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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