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A tunnel's turbulence factor is used to

  • A.Set the fan speed
  • B.Correct for model weight
  • C.Give an effective free-air Reynolds number
  • D.Measure the model's drag directly

Answer: C

Free-stream turbulence promotes early transition, so a model in a turbulent tunnel behaves as though it were at a higher Reynolds number in still air. The factor, obtained by testing a sphere of known behaviour, converts between the two and lets results from different tunnels be compared.

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