[Stoves] Premixing

[Muhammad Nurhuda]

Dear all,

The Prime/UB stoves utilizes the pre-mixing mechanisms by altering the
direction of secondary air against the smoke, in addition to the
pre-heating of both primary and secondary air.

On Oct 8, 2016 11:11 AM, "Paul Anderson" <psanders at ilstu.edu> wrote:

> Alex and all,
>
> This work on pre-mixing is, in my opinion, extremely important.  Many
> should participate.
>
> 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 10/7/2016 6:15 AM, alex english wrote:
>
> Paul,
> You asked what I might be able to do to shed light on the conditions for
> achieving a blue flame.
>
> This week I followed the evidence. It was clear from running a TLUD at
> higher temperatures that the flame behaved differently than my original
> example. The flame speed of the mix could attach at the point of secondary
> air entrance in a 2 inch pipe ( all measures are inside diameter). Reducing
> this to 1.5 inches moved the flame up to the transition back to 2 inches.
> The flame speed was two slow for the higher speed in the 1.5 inch pipe.
> However the 1.5 inch section was six inches long and it was clear that the
> flame was not very well premixed because of tall orangey tails extending
> from the lower blueish portion.  So a few increments of changes later  the
> burner now has 18 inch mixing tube between the secondary air introduction
> and the point of flame attachment. It steps down from 2 to1.5 to 1.25 and
> up again to 1.5 to 2 to 2.5 which is the cone that expands to 6 inches.
>
> This is the result;
> https://www.youtube.com/watch?v=5sjOTHwDsWo
>
> *It is quite different than the origional  slow continuous blueming flame
> flower *
> *Here again*
>
> *https://www.youtube.com/watch?v=jnV1e60NTss
> <https://www.youtube.com/watch?v=jnV1e60NTss> *
>
> *There are a differences that are due to the fuel gasses, the temperature
> of the gasses and perhaps the excess air values. All play a role. *
> *The much longer mixing tube changes the net draft as well. Also I was
> unable to light the mix from the secondary air entrance. Had to be lit top-
> down.*
>
> Here is a fun ignition shot. Talk about descending flame fronts:)
> https://www.youtube.com/watch?v=X7JepJ1MdWg
>
> You tube has a 'gear' icon in the lower right of the screen where you can
> control the speed of the video replay (without sound). It is informative to
> watch these at .25 speed. The glowing meteor sparks show up better.
> Starting and stopping the videos freeze them in there tracks. If one knew
> the frame speed of the camera you could almost calculate the velocity of
> the sparks by the length of their paths.
>
> Sorry to interrupt the very interesting discussion of charcoal.
> Alex
>
>
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