Originally Posted by Mitchell Covell
I think that you are right on this Jetplane. In the range of Re. #'s where separation occurs before transition to a turbulent boundary layer I suspect that there would be little if any difference in performance between a flat plate and an otherwise similar Kfm1.
In the few wind tunnel tests that have been performed a vortex does form in the space behind the step just as the original hypothesis assumed and the pressure distribution has a funny bump upstream of the step with a dip downstream then a spike a bit farther aft. I hate to keep harping on the same old data but new guys keep coming into the discussion and nobody else mentions that there was a good, professional, test of a few step configurations. There's a synopses of that test here