On Thu, 11 Feb 2021, Norman Yarvin wrote:
If ambient air is mixed into the exhaust as a working fluid, then it
will expand, conceivably generating additional thrust.
Still, to be realized, that thrust would have to actually exert
pressure somewhere, and the walls of that aluminum tube are parallel
to the flow, so that couldn't be where. (The bell-shaped portion is
the intake, not the exhaust.)