Hi Kevin,
The automixer is not the first thing anyone should worry about. It’s not even all that important on a pellet machine because they feed so uniformly.
Typically the Victorias don’t bridge due to the down angled nozzles. The one I have now has bridged a few times when flaring gas but as soon as I attach an engine the gas pulsation shakes the fuel down.
The shaker is there because people want to see one present, but I have never touched mine. If you keep the gas speed up it simply blows the ash through.
Here are my thoughts on building a gasifier:
This pretty much describes what is going on in the Victoria design.
Stephen