[Stoves] Rapid mixing-premixing trial

[Paul Anderson]

Alex,

If there is a spectrum of TLUD operations (and I agree that there 
probably is), then we should be able to identify a few other points in 
the spectrum and (I hope) identify what allows the blue flame and what 
does not.

Examples that are at the blue-flame end are more interesting and fewer 
than the more standard TLUD operations with the yellow flames.

What could you do with your set-up to illustrate better that spectrum 
and especially for replication of the blue flame results.

About the mixing pattern of the blue flame, I thought of "upwelling" (or 
sort of like the "rolling of water and clothes in an upright washing 
machine.   What is your word?

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 10/2/2016 1:14 PM, alex english wrote:
> Listers,
> This follows from previous comments on this topic.
>
> So testing the so called premix burner with  different TLUD fuel 
> condition yielded a very different result.
>
> Using a 5.5 inch inside diameter pipe, 7.5 inches tall as a fuel chamber.
> https://goo.gl/photos/kMhkJUTaSvHYsA7T9
>
> With the same burner assembly;
> https://goo.gl/photos/JYP5jDTkNqKvZK9h9
>
> With 5 or 6 inches of wood pellet depth it burned for roughly 50 minutes.
>
> Here is a video of the flame;
> https://www.youtube.com/watch?v=71mt-wUHadc&feature=youtu.be
>
> The primary under fuel air was not limited, Particles are entrained in 
> the gas, showing up as sparks. The temperature in the reaction zone is 
> likely 800C or more. This is a guess based on data from past 
> experience. The flame speed appears to be faster and attaches low in 
> the burner,  just after the secondary air, with essentially little or 
> no premixing. I think this condition and the previous one with the 
> blue flame represent two ends of a spectrum for natural draft tluds.
>
> I have seen some conflicting evidence about gas species from 
> gasification and pyrolysis of wood at different temperatures. It is 
> likely that there is more C02 at the lower superficial 
> velocity/temperature condition. That might be sufficient to lower 
> flame speed. The same for the  lower hydrogen content.??  I have flame 
> speeds for many gasses. Any references or theories about the what is 
> burning here??
>
> Looking closely at the blue flame video I think I see mixing pattern 
> with a name. Without my providing the name, I would like to know what 
> other people see. Hint it isn't "vortex".
> Alex
>
>
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