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An open-circuit wind tunnel differs from a closed-circuit one in that it

  • A.It draws in fresh air, not recirculated
  • B.Has no contraction section
  • C.Cannot be used below Mach 0.3
  • D.Requires no fan or compressor

Answer: A

An open-circuit or Eiffel tunnel takes air from the room and returns it there, which makes it cheap and simple but noisy and sensitive to conditions in the building. A closed-circuit tunnel recirculates the same air, giving better flow quality and lower running power for the same test section.

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