[Stoves] Studies of pressure variations in a TLUD
Harris, Kirk
gkharris316 at comcast.net
Sun Jun 14 17:37:19 CDT 2020
Ron and All,
It would be nice to know more about pressure variations inside a TLUD
and their impact on how the stove functions. This is TLUD area in need
of quality study. There are lots of intermingled and complex cause and
effect relationships.
Kirk H.
On 6/12/2020 8:30 AM, Ronal Larson wrote:
> Nganga and list:
>
> Sorry. There may be something around to help in such designs - but I
> believe the extra notes in Kirk’s 9 page description is all that is
> available. Kirk benefits from being able to work with Aprovecho
> (Dean Still) and I know that has helped. Mostly these ideas come from
> Kirk being retired and being motivated to build better TLUDs. Kirk
> has identified his thoughts as hypotheses.
>
> I feel the TLUD topic we are most missing on is the pressure
> distribution inside any TLUD
>
> There are a few good doctoral theses out there on TLUDs. I’ll try to
> come up with a list.
>
> Anyone have other help for Nganga?
>
> Nganga - where are you located and why do you ask? How else can we help?
>
> Ron
>
>
>
>> On Jun 12, 2020, at 4:38 AM, nganga liambai <nliambai at yahoo.com
>> <mailto:nliambai at yahoo.com>> wrote:
>>
>> Good day Ron,
>>
>> Your analysis of Kirk' 3 hour TLUD below is impressive and
>> motivating. However, I have found it rather too advanced in some
>> essential aspects, Is there some specific literature you can
>> prescribe in this regard to help.
>>
>> Nganga.
>>
>>
>>
>> On Fri, Jun 12, 2020 at 1:53, Ronal Larson
>> <rongretlarson at comcast.net <mailto:rongretlarson at comcast.net>> wrote:
>> List:
>>
>> 1. I list myself as a cc, because I’ve stopped receivinging
>> recent stove list material - for unknown reason (even though
>> Andrew assures me I’m still a list member). Please list me as a
>> cc if you respond to this.
>>
>> 2. This is about the new stove that Kirk talked about a few days
>> ago - and Tom Miles gave this backup from the stove archive site:
>> http://stoves.bioenergylists.org/files/harris_3_hour_tlud_06_04_20.pdf
>>
>> <https://click.api.drift.com/click/baa65bd9-95ed-4749-af2e-86ac72890cf2?u=http%3A%2F%2Fstoves.bioenergylists.org%2Ffiles%2Fharris_3_hour_tlud_06_04_20.pdf%3Fd_utk%3D2c66a24b-c042-4db9-905e-b77c486b8996&h=96c42694cdbd72a4e1f2c4732c6fdebd>
>>
>> You’ll need to look that over to see what I talk about below.
>>
>> 3. To help with my present interest (with Kevin McLean) in
>> stoves using corn cobs, I’ve now talked for several hours with
>> Kirk about his new design. My main purpose in this note is to
>> have others look closely at what Kirk has told us. I know if no
>> other TLUD that comes anywhere close to handling 3 hours of use -
>> and with super emphasis on combined char-making, efficiency and
>> clean burns. Will be tested as soon as virus conditions improve.
>>
>> 4. The first new idea I see here is that the center of pyrolysis
>> gas combustion moves upward as the power level increases. Anyone
>> seen that principle before?
>> Kirk has a very wide range of possible power levels - probably a
>> turn down ratio (TDR) greater than 10 - bigger range than my home
>> electric range. Of course not natural draft, but a natural
>> draft version using his principles seems likely to get better
>> than TLUD's usual TDR < 2.
>> The lowest power level is accommodated with a set of relatively
>> small holes just above the maximum fuel level. There is some
>> preheating of that secondary air.
>> Average power levels (an incredible 5-6 kW) are predominantly
>> handled a few inches further up for the pyrolysis gas volume that
>> is too large to be handled by the “low power" holes. This by the
>> excess gasses seeing some restriction - by striking a central
>> "blunt body”. As these “average” gases flow outward, they create
>> (via Venturi principles) a lower pressure regime that further
>> encourages mixing. For me, two new ideas.
>> As power level is further increased( by adjusting blower speed
>> and/or location), these larger gases that could not be combusted
>> by the first two means meet the outer most secondary air gases
>> that are being forced inward at another diameter restriction
>> location. Also, for me, a new idea.
>>
>> 5. Another new idea:Above these three meetings of the two gas
>> streams there are further radii changes supported by a central
>> column - that I haven’t seen before. Again, used to get more
>> clean combustion and improved efficiency. (And all planchas need
>> effciency help.)
>>
>> 6. The way he is handling the fan/blower seems new. All
>> focused on primary air control. His secondary air is all natural
>> draft.
>>
>> 7. Kirk has come up with this at his own expense. To help a
>> group interested in adding charcoal- making to plancha type
>> cooking. There are several theses in here for someone able to
>> instrument this for the numerous interesting pressure and
>> turbulence variations that Kirk has included.
>>
>> Kirk - thanks for all this new work (and please correct what I
>> have gotten wrong here). (I think Kirk already holds the world
>> record for cleanliness - I hear that testers are sure it can’t be
>> as clean as he has already proven he can get.)
>>
>> Ron
>>
>>
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>> <Untitled.txt>
>
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