Jay Beckman wrote:

Am I correct in thinking that disrupting the airflow into a turbofan engine
sets up a momentarilly over-rich mixture (hence the visible flame?)

The early jets (1940s) were prone to compressor stall. Several books I have
which discuss that period state that the mixture goes rich when this happens. In
something like the Me-262, it would get rich enough for the fire to go out.
'
George Patterson
Coffee is only a way of stealing time that should by rights belong to
your slightly older self.