[Stoves] Studies of pressure variations in a TLUD - Pulsing Flame with Concentrator Rings

[Julien Winter]

Hi Crispin;

Thanks for your helpful comments.  It is an interesting problem, and we can
see if there are some critical experiments that could refute your
hypothesis.  If your hypothesis can't be refuted, then it gains
corroborating evidence (after Karl Popper).

I do use holes in the side wall of TLUD reactors, such as in the Akha
Stove, to make them more dependable.  (The last thing a cook wants is a
flamed-out, smoking TLUD, and that could kill stove acceptance.)  However,
this has not been examined systematically, and that is what I am about to
do.

Creating cenelations at the top of the TLUD reactor, at the entry point of
the secondary air, is not something I have seen before.  That could help
the entrainment of reactor gases into moving secondary air.

One might be tempted to create swirl with metal fins at the crenelations.
I don't think that is a good idea.  In the past, I have experimented with
giving the secondary a horizontal-tangential component of motion to create
a rotating swirl.  Rotation might increase turbulent mixing with forced
air, but under natural draft conditions, I have observed a fire 'tornado,'
in which, theoretically, there is actually less turbulent mixing than with
non rotating secondary air.  As a result, flame height increased as the
rotation of ambient secondary air increased.  That is supported by
published research where the ambient air around a fire is rotated.

In a couple of weeks, I will post some results, and it will be clearing
what I am up to.

Cheers,
Julien.



-- 
Julien Winter
Cobourg, ON, CANADA
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