Re: Down draft stoves are grate!

["Ron Larson" <ronallarson@qwest.net>]

Piet:

    Thanks for your answer (later)  to the first question below from Paul.
But you didn't answer the second question on flame holding.  Could you
describe something more about what happens when the fuel loading is either
too fast or slow?  Is there any difference between your design and the work
described by Khan?  (In other words, could you say more about the operation
on each side of the "sweet spot".  Length of flame, where the flame seems to
attach, etc.)
    I would like to believe that,  under all conditions, the flame is
attached to the burning wood.  Paul seems to believe there is a large
separation between the wooden blocks and the flame - not true?
    Could you also address anything special about best ways for start up?
And what conditions lead to flame out (due to wind?  due to too much fuel?
too little?)  and what you then need to do to re-ignite)

Thanks in advance.

----- Original Message -----
From: Paul S. Anderson <psanders@ilstu.edu>
To: Ron Larson <ronallarson@qwest.net>; Peter Verhaart
<pverhaart@optusnet.com.au>; Rogerio Miranda <rmiranda@sdnnic.org.ni>
Cc: <stoves@crest.org>
Sent: Thursday, January 03, 2002 3:07 PM
Subject: Re: Down draft stoves are grate!


> Hi,
>
> the shown DD BBQ did NOT have much of a hopper to hold the fuel, and, as
> pointed out by Ron, does NOT have much control over the primary air supply
> (except some adjustable grate that did not sound like much control, but I
> might be wrong.)
>
> ALL of my work with the IDD gasifier focuses attention to the need to
> control the primary air supply.
>
> Also, is it not possible that the generated gases are too far from the
> flame to be continually ignited?  A concern with the IDD is a "flare-out"
> loss of flame to ignite the gases, thus resulting in smoke that should be
> consumed in the flames.  Is there an ignition method for the BBQ with the
> DD fuel supply?
>
> Paul






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