[Stoves] Premix configuration

[Paul Anderson]

Alex,

Yes!!  Congratulations on the accomplishments!!    You show pre-mixing 
of pyrolytic gases with air (that contains O2), but at such a speed of 
gas flow that the flame cannot get down to the level of the entrance of 
the secondary air, resulting in blue flames.

This leads to some questions.  Some are clearly for you to tell of your 
experiences.   Others are suggestions of what other people could do if 
they wanted to get involved in replication.  There are some variables 
(device characteristics) that are not stated, so this is not yet 
something that a casual observer would do without further understanding.

1.  Is you unit with forced primary air?  Please describe.  If not with 
forced primar air, is there additional riser (chimney) above the zone of 
ignited gases?

2.  Is there any turn-down capability?   And if turn-down of primary air 
does occur, we would expect the zone of the ignited gases to be lower in 
the funnel, right?

3.  What might happen if there was forced secondary air?

4.  If a flame/spark was introduced at the point of the entry of the 
secondary air, what would happen?  ...
a.  a yellow flame upward in the funnel?
b.  extinguished spark/flame (that is, no ignition)?
c.  the flame goes up to the top and becomes blue without any flame 
lower down?

5.  How do you actually ignite the pre-mixed gases?  That is, when and 
where do you first ignite the gases that were shown in the video?

6.  Please comment on extending the narrow (2 inch diameter) section so 
that the blue flame would be even further from the entrance of the 
secondary air.   How far?   And if the diameter was even smaller, could 
the length be even longer?

7.  Have you experimented with sending the pyrolytic gases a longer 
distance before the entry of the secondary air?

VERY interesting!!!!

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 9/29/2016 12:03 PM, alex english wrote:
>
> Paul,
> See below for a link to a picture.
> The gasses rise through a 2 inch diameter pipe which draws from a 12 
> inch diameter fuel chamber. Secondary air is introduced tangentially 
> below the smooth funnel which expands to  6 inches. The picture shows 
> that the high heat from the flame affects only the top of the funnel. 
> So there is an 8 inch + distance where premixing occurred and velocity 
> exceeds the flame speed.
>
> https://goo.gl/photos/GB9PMaf6dX3n8cQ78
>
> See video by Alex:
> Here is a recent video of my premixed blue tlud-gas flame. Its all 
> geometry, no obstruction.
> https://www.youtube.com/watch?v=jnV1e60NTss&feature=youtu.be 
> <https://www.youtube.com/watch?v=jnV1e60NTss&feature=youtu.be>

> Alex
>
>
>
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