I was wondering if anyone has ever experimented with something like a basket ball size sphere inline about half way up a 6 inch riser configuration, then closing back down to the 6 inch riser diameter for the rest of the riser.
or possibly more than one sphere in a line in the riser.
Or possible different shape like a toroid.
I was wondering if this would create a low pressure zone(s) that would cause the unburned gasses to slow down and mix around in the chamber, and also a super heated flame would be shooting right into the slower gasses possibily helping to combust them?
I understand this is essentially the effect the top of the barrel has. I was just curious if closing the diameter back down again, with a ratio of dimensions that would still keep the airstream moving through the riser would have any kind of interesting effect.