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The pressure distribution over a lifting airfoil typically shows

  • A.Uniform pressure over the whole of the upper surface
  • B.Positive pressure coefficients everywhere on both surfaces
  • C.A strong suction peak near the leading edge on the upper surface
  • D.The greatest suction at the trailing edge on the upper surface

Answer: C

Flow accelerating around the nose produces the largest negative pressure coefficient just aft of the leading edge, and the pressure then recovers towards the trailing edge. It is that recovery, an adverse gradient, which eventually causes separation.

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