[Stoves] basics: Need different flame-speeds different mixture-procedures?

[Crispin Pemberton-Pigott]

Dear Martin

Thanks for the interesting analysis.

I feel that the need for a high speed jet (faster than the flame speed) is
not needed useless there is air premixed into it.  This changes your
analysis a bit because it means either gas could be fed at a low speed into
the air and they would both burn well.

If you premix air into it, then your gas speed analysis holds true.

The baffle plate is needed where the gas speed is much higher than the flame
speed, but is not needed in all cases, whether premixed or not.  Sometimes
it is called a 'bluff body' which means a plate across the gas path.

The advantage of a bluff body is that you can shape the gas path and make
the flame flow torordial, for example, giving good mixing and a hot flame in
a very short distance.  The FSP stove does this.  If the bluff body is
removed (by tipping the stove over for example) the flame blows itself out.

Regards
Crispin

-----Original Message-----
Dear all,

            reeding the the comments in the stoves-list, mentioning the
different flame speeds for H2 and woodgas  "a coin dropped in my mind".

There are "worlds" between the two different speeds.[snip]