[Stoves] TLUD gas mixing

[Harris, Kirk]

Ron,

Thank you for the response and questions.  I put the paper on the stoves 
list thinking that it would not be pertinent on the biochar list.

Have you found any equations to give the pressure changes you want?

The only math that I am capable of is simple, and for building simple 
stoves designed from experience.

How did you pick the small cone angle fand diameter) for the two bluff 
bodies? They are both from experience. The cone angle resulted from 
trying different angles. The diameters began at the same diameter as the 
fuel reactor chamber. I found nothing that works better, except perhaps 
a little bit larger on the upper bluff body. Too small does not get 
enough increase in gas velocity or surface contact with the secondary 
air, and too large creates too much flow resistance, hurting the stove 
function. Same opening size question for the two concentrating rings?
The concentrator ring on the fuel chamber is a size that worked well with turn-down to low power.  The upper ring works well in a range from the same diameter as the lower ring, up to the diameter of the bluff body.

If you had added a swirl component to get a longer path length, might 
that have been worth the extra cost and complexity? Or are you pretty 
sure (from your measurements at Aprovecho you have very minimum exiting 
combustible gas? (Or enough exiting Oxygen?)
I have considered swirl to provide more dwell time.  Note the inward and outward movement of the flame already gives extra dwell time.  I don't think swirl is needed as the emissions are very clean.

Kirk H.


On 7/16/2023 9:50 AM, Ronal Larson wrote:
> Kirk and stoves list;  adding biochar.io for the many who may be flaring their syngas.
>
> 	Another great stove message.  Thanks.  (To others - Kirk and I have been discussing this topic for about 20 years (before the word “biochar”)
>
> 	I’m pretty sure this could be analyzed with different thermo models relatively easily -  because it is 2-D (nothing happening in rotational direction.  There could be a Masters or Doctoral thesis in here..
>
> 	Have you found any equations to give the pressure changes you want?
>
> 	 How did you pick the small cone angle fand diameter) for the two bluff bodies?
>
> 	Same opening size question for the two concentrating rings?
>
> 	If you had added a swirl component to get a longer path length, might that have been worth the extra cost and complexity? Or are you pretty sure (from your measurements at Aprovecho you have very minimum exiting combustible gas?  (Or enough exiting Oxygen?)
>
> Ron
>
>
>> On Jul 15, 2023, at 12:51 PM, Harris, Kirk<gkharris316 at comcast.net>  wrote:
>>
>> Hi All,
>>
>> Attached is a document showing some interesting things I have been working on.  A stove with the single specialized bluff body tested exceptionally clean at Aprovecho (6-23-23).  Perhaps not of any use, but maybe interesting to some.
>>
>> Kirk H.
>>
>>
>> -- 
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>>
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