The first time I heard of this concept was when Max brought it up in my 1995 Geo Tracker thread posts 300 to 302. I think I am going to try this on my 1996 S10 project
[quote="gasman, post:303, topic:1191, full:true"]
Protruding or not, there is sucktion from all around the air beam.With no preference from which direction.
But, if you have a horizontal ring channel, relatively free from indropping chunks, there will be a "preference" route for collecting pyrolysis gases between the nozzles.
This way, a more uniform collection of pyrolysis gases happens on the right height and are redirected with the air-beams back into the "white h-ll".Better to not make any significant protruding, as the sucking is best at the air-beam "root"!
I see it happen in my hearth as the silo funnel is slightly "over-roofing" my nozzle-tips.
Under the "roof-edge" the pyrolysing gases are effectively collected and re-blasted into the white glow.
In a hearh with only 4 nozzles this phenomenon plays a remarkable role to get tarless gas at long idles and town traffic jams... idling at ~800 RPM.