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At high subsonic cruise, the streamtube ahead of a pitot intake is

  • A.Independent of flight speed
  • B.Smaller than the intake area, expanding towards it
  • C.Larger than the intake area, contracting towards it
  • D.Exactly equal to the intake area

Answer: B

The flow is already moving faster than the compressor requires, so deceleration begins outside the intake in a diverging streamtube. The intake is sized so that this external diffusion is modest, since too much of it invites separation at the lip.

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