Stall strips are used to initiate flow separation at chosen locations on the wing during high-angle of attack flight, so as to improve the controllability of the aircraft when it enters spin.
42.
However, since a round leading edge decreases an airfoil's susceptibility to flow separation, a sharp leading edge implies that the airfoil will be more sensitive to changes in angle of attack.
43.
"' Flow separation "'occurs when the boundary layer travels far enough against an adverse pressure gradient that the speed of the boundary layer relative to the object falls almost to zero.
44.
One was the flow separation on the upper side of delta-shaped airfoils of high speed aircraft ( Concorde ), The angle of attack of the leading edge resulted in a swirl flow that became unstable.
45.
1 . "'Conical diffuser or straight divergent tube "'- This type of draft tube consists of a conical diffuser with half angle generally less than equal to 10?to prevent flow separation.
46.
As the angle of attack increases, the leading edge of the wing generates a vortex which energizes the flow on the upper surface of the wing, delaying flow separation, and giving the delta a very high stall angle.
47.
Rockets can usually be throttled down to an exit pressure of about one-third of ambient pressure ( often limited by flow separation in nozzles ) and up to a maximum limit determined only by the mechanical strength of the engine.
48.
The major reason flaps were not effective is that the airflow over the wing could only be " bent so much " before it stopped following the wing profile, a condition known as "'flow separation " '.
49.
This latter attribute was obtained by radically increasing the sweep of the outermost part of the tip ( the outer 2 % approximately ) to a value ( 70 degrees ) where any significant angle of attack will cause leading edge flow separation.
50.
The boundary layer on the cone is stretched as it moves up the cone preventing flow separation, but for the internal compression and the subsonic compression the boundary layer still tends to separate and usually is sucked through tiny holes in the wall.
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