I'm not sure if used on a leading edge it would also be called a "Chevron", but I know it works.
I did it on my hovercraft splitter years ago, it helped reduce the noise by spreading out the sound nodes and lower their peaks.
Hovercraft - Experimental Skirt Project - Page 2 - Boat Design Forums
Adding air to a stream at lower pressure by increasing the velocity is what I did on my S-10 pick-up roof wing.
See link in signature below.
It would be interesting to see some specific ideas and applications (sketches).
Personally I don't feel motivated to develop a hybrid idea (
combining ideas from previous projects) without a goal in mind.