wing fences
Wing fences are fin-like vertical surfaces attached to the upper surface of the wing, that are used to control the airflow.
WING FENCE
Term preferred by Airbus and McDonnell-Douglas aircraft manufacturers for the vertical structures at the outside ends of the wings of some of their je...
Winglets and wing fences also increase efficiency by reducing vortex interference with laminar airflow near the tips of the wing, ...
They are particularly useful in preventing spanwise flow at high angles of attack, by shedding a vortex, similar to that of a wing fence. Vortilons generate a vortex over the upper surface at high angles of attack.
 See also: Speed, Landing, Flight, Plane, Wing
  
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