As suggested by @johnny comelately, this probably deserves a thread of its own. Over to you johnny.
It still looks like a vortex ring is ejected by the pre chamber nozzle, and is ignited by self-shear to me.gruntguru wrote: ↑27 Apr 2022, 00:40The more I look at that video the more it appears the spontaneous combustion at the perimeter of the chamber is NOT initiated by events in the pre-chamber. Conclusion - for al least the one cycle shown, combustion would have proceeded without the spark.
The combustion at the perimeter progresses inwards as a flame front - ie not HCCI!
The jet ignition is still responsible for rapidly accelerating the combustion of the remaining charge.
Hypothesis. The spontaneous combustion is a kind of "pre-ignition" event that is accelerated by its proximity to the squish zone and the high turbulence there prevents conversion to a detonation event.
This particular discussion now becomes a matter of timing: which occurs first.gruntguru wrote: ↑27 Apr 2022, 00:40The more I look at that video the more it appears the spontaneous combustion at the perimeter of the chamber is NOT initiated by events in the pre-chamber. Conclusion - for al least the one cycle shown, combustion would have proceeded without the spark.
The combustion at the perimeter progresses inwards as a flame front - ie not HCCI!
The jet ignition is still responsible for rapidly accelerating the combustion of the remaining charge.
Hypothesis. The spontaneous combustion is a kind of "pre-ignition" event that is accelerated by its proximity to the squish zone and the high turbulence there prevents conversion to a detonation event.
Yes, the "previous" giving rise to the predictive.