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Discussion

The contraction section of a wind tunnel serves to

  • A.Introduce turbulence for realistic testing
  • B.Support the model
  • C.Accelerate the flow and improve its quality
  • D.Slow the flow before the test section

Answer: C

Accelerating the flow stretches the streamwise vortex lines and reduces the turbulence intensity relative to the mean velocity, so a large contraction ratio buys good flow quality. Ratios between six and ten to one are usual on subsonic tunnels.

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