[Stoves] The round wick kerosene lamp/stove

[Thomas Reed]

Dear ND TLUD STOVERS:

Consider the round wick kerosene lamp and stove. 

    * It uses a beautiful "gallery" of 2 mm holes to inject aspirated
      air into the wicking kerosene vapor
    * The gallery achieves an adequate interface between the 1000 air
      inlets and the rising kerosene vapor from the wick and mixes 15 g
      of air with each g of K vapor
    * It probably took 50 years to develop after kerosene became a world
      fuel
    * The lamp uses a chimney, but if you tried to cook at the top of
      the chimney the heat would have been conducted away.
    * I think there may be a cook stove variety.  If so, buy one and
      copy it.  If not, give up.

In haste,

TOM

Tom Reed
Biomass Energy & Carbon
Chief Scientist
http://www.biomassec.com



Paul S. Anderson wrote:
> I also congratulate Sai Baskar for  his innovative work.  This is how 
> we all
> learn and progress.
>
> My comments relate to what Crispin wrote:
>
> Quoting Crispin Pemberton-Pigott <crispinpigott at gmail.com>:
>
>>
>> It is important to see that all the flames have reached the outer 
>> wall of
>> the combustion chamber. This is not so good. The flame will chill 
>> against
>> the outer shell and increase the CO level in that region.
>>
> I think I disagree.  These are not regular flames of hot gases 
> entering into a
> mass of air.  These are inverted flames of air entering into a mass of 
> hot
> gases (as Crispin correctly noted later in his message).  As such, if 
> the air
> jet reaches the outside cylinder, it spreads out the air stream and 
> does not
> cool the gases against the cylinder.  I am not advocating massive jets 
> of air
> to that wall, but experimentation is justified.  Might have desirable 
> results
> such as keeping CO from sneaking up the side walls.
>
> I totally agree with Crispin's next comments:
>>
>>
>> In addition, there is still a triangular region between each of the 
>> flames
>> through which it is possible to pass at least some smoke that remains
>> unburned.
>> So.I suggest that without changing anything else, increase the number of
>> holes, completing a ring of holes in the same vertical position as 
>> the '8th
>> hole', but recalculating the hole diameter to the total area remains the
>> same.
>>
> I have not read that the hole diameters and associated secondary air 
> flows have
> been rigorously calculated and/or emperically tested to get the proper 
> amount
> of secondary air.  Yes for more holes, but experiment on how much air is
> needed.  Unfortunately, without CO emissions testing, it is a qualitative
> "impression" of when the right amount of air is present, not a 
> quantitative
> measurement.
>
>> There will then be 14 flames radiating from the centre, giving what 
>> may be
>> 100% coverage of the combustion chamber, but with the total area of the
>> secondary air holes being equal to the present 8 holes. If there are any
>> holes through to top plate (it appears there are) leave them closed.
>
> Maybe.  Better to just test to see if there is any impact of having 
> those holes
> open or closed.
>
> One other thing to test is the use of a "concentrator disk" or "lid" 
> as is found
> in Paal Wendelbo's Peko Pe TLUD and in my Champion TLUD (and in our 
> current
> joint efforts in India).  The concept applies to bringing the 
> flames/gases/air
> together through a constriction to cause increased mixing and the 
> avoid the
> "wafflely" wavering nature of gentle flames.  Because of the 
> innovative entry
> of the secondary air via the vertical central pipe, the "lid" might 
> have a 4 to
> 6 inch (10 or 15 cm) diameter hole in a lid that covers over a 7 or 8 
> inch
> diameter fuel cylinder.   This might eliminate the need for any hole 
> in the
> outside cylinder.  Only experimentation will clarify this question.
>
> Best wishes, and please keep us posted on your progress (including 
> telling us
> things that do not work.)
>
> Paul
>
>
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