sorry for the problems with you gasifier but great to see you developing it further!
On my computer, I could barely understand what you were talking about as the speakers are not good, but from whait I see I understand that the restriction above the nozzles is the damaged part, right?
Everything else is still good in shape?
So, why not just remove the restriction between nozzles and hopper?
Another suggestion: Have you thought about something like the Svedlund-design with a nozzle pointing downwards? Probably combined with an “umbrella” to prevent direct contact of glowing char with the nozzle as Max Gasman suggested it:
Based on this, I made a scetch some time ago for what I was planning for the Land-Rover:
Well, life kept me busy so I haven’t started yet and I cannot present any experiences about this nozzle design yet, but I think it is worth a try.
Anyway, I’m also curious how a flute nozzle will behave in a downdraft system.
Please keep us informed and keep on with this very interesting project!