The technical answer you are looking for is found in The Kutta Condition
just a method of laying siege to certain second order differential equations-provided certain conditions are met or assumed
in airfoil design--- certain equations have been found to approximately model the lift or drag characteristics of a wing section but nevertheless the WIND TUNNEL remains the reall proving grounds as aerodynamics is an empirical science that lends itself to a more mathmatical --as opposed-- to verbal discussion--
Let's not even attempt a discussion of high lift devices
I propose a simple explanation. Lift is caused by differential velocity between a flat plate solid and a Newtonian fluid. The amount of lift (and drag) is caused by the pressure ratio which may be varied by changing the angle of incidence between fluid and fp solid, and/or the shape of the solid
absolutively
PA