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Which of the following would NOT be expected to trigger early transition on a wing?

  • A.Surface waviness from manufacturing
  • B.Applying suction through a porous leading edge
  • C.Insect contamination on the leading edge
  • D.High free-stream turbulence

Answer: B

Suction is used precisely to postpone transition by removing the slowest fluid and stabilising the profile; it is the basis of laminar flow control. The other three all introduce or amplify the disturbances that trip the layer, and all three limit laminar-flow aerofoils in service.

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