[Stoves] Premixing

[Paul Anderson]

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
> /
> /
> /
> /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
>
>
> _______________________________________________
> Stoves mailing list
>
> to Send a Message to the list, use the email address
> stoves at lists.bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
>
> for more Biomass Cooking Stoves,  News and Information see our web site:
> http://stoves.bioenergylists.org/
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20161007/c3adbcd5/attachment.html>