Shisa Stove Enjera cooker

["Crispin" <crispin@newdawn.sz>]

Dear Stovers

Well, I have given it a shot - we made a ring from 10mm round bar (R10 it is
called) and stood it on three legs so that there is a 20mm space between the
top lip of the stove and the underside of the ring.  The Enjera cooker plate
will sit on top of the ring.

The gas exit area of the space is 285dia x Pi x 20mm = 180 cm^2 which is
roughly three times the inlet area when wide open.  This means the velocity
of the combustion gasses escaping through the gap will be relatively high
compared with the velocity in other parts of the stove.

My hope is that the speed will carry heat rapidly away from the centre
towards the edges and result in a more even heating in the outer areas.  The
lid of the can may be used as a heat conducting shield under the centre of
the cooking plate by plunking it top of the ring before putting on the
cooking plate.  Varying the thickness of the plate under the centre will
produce about as even a heat as one can get from a small central fire.

This layout, if it works, will enable the cook to use a different fuel - not
leaves - something smaller, hotter and more controllable.  The fire will
probably be tiny - 2 to 300 gms of wood in large chunks, perhaps only one,
and well choked.

It should also burn 1/2 loads of leaves pretty well as a top lit, updraft
gasifier.  The primary preheating is important for the leaves which can hold
a lot of moisture for their dry weight.  Hopefully the steam condenses on
the outer portions of the clay cooking plate - a sort of heat pipe.

Regards
Crispin


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