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The Kutta condition is imposed in airfoil theory in order to

  • A.Guarantee that the boundary layer stays laminar
  • B.Select the one physically realistic value of circulation
  • C.Ensure that the flow separates at the leading edge
  • D.Force the lift coefficient to be exactly zero

Answer: B

Potential flow admits infinitely many circulations around a given shape, and all but one give an infinite velocity round the sharp trailing edge. Requiring smooth departure there picks the value nature adopts and so fixes the lift.

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