Answer Posted / himanshu
its basically use to increase divergence mach no. locally , so that it can fly at greater speed without raising the drag. In unswept wing the drag shoots up at m=1 because the locally mach no.(NEAR WING SURFACE) exceeded the value of m=1.2 which generally a supersonic region , its generate the shock wave over the wing surface followed by the seperation of boundry layer flow near the leading edge and this phenomena raises drag over the wing surface tremendously.
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