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A tunnel operator reports a turbulence factor below one. This is

  • A.Expected at supersonic speeds
  • B.Implausible; it cannot fall below one
  • C.Normal for a good tunnel
  • D.Expected in a cryogenic tunnel

Answer: B

The factor converts the tunnel Reynolds number to a higher effective free-air value, because free-stream turbulence promotes early transition. A value below one would mean the tunnel was quieter than still air, which is not physically meaningful; the best tunnels approach one from above.

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