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Solid blockage correction accounts for the fact that the model

  • A.Adds weight to the tunnel structure
  • B.Changes the tunnel's turbulence level
  • C.Alters the fan speed
  • D.It reduces the area available to the flow

Answer: D

The model occupies part of the test section, so continuity forces the surrounding air to speed up and the measured forces come out too high. The correction scales with the ratio of model volume to test-section area, which is why frontal area is usually kept below a few per cent of the section.

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