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A trip strip or turbulator is fitted to a wind-tunnel model in order to

  • A.Fix transition at a chosen station
  • B.Reduce the model's drag
  • C.Support the model in the tunnel
  • D.Measure the surface pressure

Answer: A

At model Reynolds numbers the layer would stay laminar far further back than it does at full scale, so a small strip of roughness is added to force transition where it belongs. Placing and sizing it correctly is a matter of some art, and getting it wrong corrupts the drag data.

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