A slat is selectively extended from a main wing body, with a concave rear
surface of the slat facing a convex forward nose surface of the wing body,
with a slat gap therebetween. At least one row of flexible bristles is
movably arranged relative to the lower rear edge of the slat, to flexibly
protrude up into the slat air gap. At least one row of flexible bristles
is movably arranged along the upper rear edge of the slat to extend
rearwardly over the slat air gap and the upper surface of the main wing
body. The flexible bristles are flexibly self-positioning and
self-contouring due to the aerodynamic forces acting thereon, to improve
the air flow conditions through the slat gap, separate the slat gap
airflow from an entrapped eddy vortex on the concave rear surface of the
slat, and thereby reduce the aerodynamic noise generated along the slat
gap.
