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Leading-edge flaps Aug 01, 2017

he aircraft's wing front seam strip mainly increases the lift and the resistance when the airplane takes off and the landing, is the front extension which passes through the sliderecovery.


Moving the trailing edge flaps to the leading edge of the wing becomes a leading edge flap (note: different from that of the slats). The leading edge flaps can also be viewed as a leading edge of deflection. Under the large angle of attack, it is deflected downward, so that the angle between the leading edge and the flow is reduced, the flow of airflow along the upper wing is smoother, the local airflow is avoided and the camber of the airfoil can be increased.


The combination of leading edge flaps and trailing edge flaps can further improve the effect. The general trailing edge flaps have a drawback, that is, when it is deflected downward, although it can increase the flow velocity of the upper wing surface, and increase the lift coefficient, but at the same time, it also makes the local angle of the wing at the front of the airfoil increase, and when the plane is flying with the large angle of attack, it is easy to cause partial airflow separation in the upper part of the wing If the leading edge flaps are used at this time, not only the local airflow separation in the upper part of the wing leading edge can be eliminated, but also the enhancement effect of the trailing edge flaps is improved.


Kruger Flaps: There is also a Kruger (Krueger) flap that is the same as the front flap. It is generally located at the root of the wing leading edge, by making the movable cylinder. Opening, to the wing under the front, not only increase the wing area, but also increase the airfoil curvature, with a good effect of the increase, and the structure is relatively simple.