From what I understand, induced drag comes from a reduction of the effective angle seen by the airfoil.
However, from wind tunnel smoke visualization, we can see that the streamlines at the leading edges and stagnation point tend to "go upward'. Which is the opposite of what the effective relative wind is supposed to be and do.
Is this "upward tilt angle" of the streamlines, the result of suction from the upper surface minus the induced angle?
I've included two pictures: