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Which of these does NOT reduce wall interference in a transonic tunnel?

  • A.Making the test-section walls solid and rigid
  • B.Slotting the test-section walls
  • C.Perforating the test-section walls
  • D.Reducing the model's size relative to the section

Answer: A

Solid walls make transonic interference worse, and near Mach one they cause the section to choke outright. Ventilated walls let flow spill in or out and were the innovation that made routine transonic testing possible.

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